Securaplane

12350 N. Vistoso Park Rd., Oro Valley, Arizona 85755 U.S.A.

Tel: 1-520-297-0844 Fax: 1-520-498-4924
Cage Code: 0TMJ9

TRANSMITTAL SHEET
TO: HOLDERS OF THE XL246-A EMERGENCY BATTERY SYSTEM
MAINTENANCE MANUAL, MM-0007-01 REV 10 (ATA 24-32-06),
DATED JUNE 09/17

REVISION NO. 11, DATED JAN 02, 2018

Effective January 02, 2018, MM-0007-01 Rev 10 (24-32-06) ACMM XL246-A for the XL246-A
Emergency Battery System is revised per the highlights of change listed here.

Pages which have been revised, added, or removed are shown below, with the reasons for the
change.

Subject/Page Description of Change

Transmittal Sheet Modified the Transmittal Sheet to correct the header and footer.

Page T1
Initial Issue: 00/05/31 Revision No. - 11
Manual Part Number: MM-0007-01 24-32-06 18/01/02
 Securaplane
12350 N. Vistoso Park Rd., Oro Valley, Arizona 85755 U.S.A.
Tel: 1-520-297-0844 Fax: 1-520-498-4924
Cage Code: 0TMJ9

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Initial Issue: 00/05/31 Revision No. - 11
Manual Part Number: MM-0007-01 24-32-06 18/01/02
 Securaplane
12350 N. Vistoso Park Rd., Oro Valley, Arizona 85755 U.S.A.
Tel: 1-520-297-0844 Fax: 1-520-498-4924
Cage Code: 0TMJ9

XL246-A
Emergency Battery System
Part No. 100-0202-01 (15 Amp CB)
Part No. 100-0202-02 (10 Amp CB)

Aircraft
Maintenance Manual

[Direct Replacement for URDC AMPS-2000]

SENSITIVE BUT UNCLASSIFIED – EXPORT CONTROLLED – EAR RESTRICTED. This Technology

Contains Technical Data Controlled under the Export Administration Regulations
(15 CFR 730-774).

The ECCN for this document is: 9E991.

Page TP1
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Manual Part Number: MM-0007-01
24-32-06 Revision No. - 11
18/01/02
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Initial Issue: 00/05/31
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24-32-06 Revision No. - 11
18/01/02
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Part Numbers: 100-0202-01 and 100-0202-02

SAFETY ADVISORY
WARNING: BEFORE THE MATERIALS CALLED OUT IN THIS PUBLICATION ARE USED, KNOW
THE HANDLING, STORAGE AND DISPOSAL PRECAUTIONS RECOMMENDED BY
THE MANUFACTURER OR SUPPLIER. FAILURE TO COMPLY WITH THE
MANUFACTURERS' OR SUPPLIERS' RECOMMENDATIONS CAN RESULT IN
PERSONAL INJURY OR DISEASE.

WARRANTY/LIABILITY ADVISORY

SECURAPLANE ASSUMES NO RESPONSIBILITY FOR ANY SECURAPLANE EQUIPMENT WHICH IS

NOT MAINTAINED AND/OR REPAIRED IN ACCORDANCE WITH SECURAPLANE’S PUBLISHED
INSTRUCTIONS AND/OR SECURAPLANE’S REPAIR AUTHORIZATION. NEITHER DOES
SECURAPLANE ASSUME RESPONSIBILITY FOR SPECIAL TOOLS AND TEST EQUIPMENT
FABRICATED BY COMPANIES OTHER THAN SECURAPLANE.

INCORRECTLY REPAIRED COMPONENTS CAN AFFECT AIRWORTHINESS OR DECREASE THE

LIFE OF THE COMPONENTS. INCORRECTLY FABRICATED SPECIAL TOOLING OR TEST
EQUIPMENT CAN RESULT IN DAMAGE TO PRODUCT COMPONENTS OR GIVE
UNSATISFACTORY RESULTS.

CONFIDENTIALITY NOTICE

This document contains confidential and proprietary information, which is proprietary to Securaplane®
and shall not be copied or reproduced, in whole or in part, or the contents divulged or used for
manufacture, without the specific written permission of Securaplane. Recipient, by acceptance, use, or
retention of this document, acknowledges and agrees to the foregoing and covenants to maintain the
contents in confidence.

INTELLECTUAL PROPERTY

This document contains Securaplane Technologies, Inc. Intellectual Property. All rights are reserved by
Securaplane Technologies, Inc. to the fullest extent permitted by law. Possession, use, duplication,
modification or disclosure of this document, in whole or in part, for any purpose, including without
limitation the creation of derivative works, the performance of repairs, or the design, qualification,
manufacture, sale and/or provision of products or services, is strictly subject to the Recipient having
received express written permission from Securaplane Technologies, Inc. in each instance. Receipt or
possession of this document alone does not constitute permission by the Securaplane Technologies, Inc.
and failure to comply with these restrictions is illegal and may result in criminal and/or civil liability.

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Part Numbers: 100-0202-01 and 100-0202-02
AIRCRAFT-ON-GROUND (AOG) SERVICE

For AOG service contact Securaplane at Tel: 1-520-297-0844 (US Toll Free: 1-800-279-7327). After
business hours, follow the AOG directions in the recorded message.

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Record of Revisions
Revision No. Issue Date Insertion Date Initials
Original May 31/00
Rev A Jan 14/02
Rev B Apr 11/02
Rev C Oct 21/02
Rev D Mar 11/03
Rev E Aug 05/03
Rev F Jan 12/04
Rev G Dec 02/05
8 Dec 08/11
9 16/11/21
10 17/06/09
11 18/01/02

Retain this record in front of the manual. Upon receipt of revisions, insert and remove pages
according to the List of Effective Pages. Then enter, on this page, the revision number, issue date,
insertion date, and your initials.

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Record of Temporary Revisions

Revision Insertion Date and Removal
No. Page No. Issue Date Initials Date/Initials/Reason

Retain this record in front of the manual. Upon receipt of a Temporary Revision, insert pages into
manual and enter, on this page, the change number, page number, issue date, insertion date, and
your initials. Also, record the removal of each temporary revision you remove.

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Record of Temporary Revisions - continued

Revision Insertion Date and Removal
No. Page No. Issue Date Initials Date/Initials/Reason

Retain this record in front of the manual. Upon receipt of a Temporary Revision, insert pages into
manual and enter, on this page, the change number, page number, issue date, insertion date, and
your initials. Also, record the removal of each temporary revision you remove.

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Part Numbers: 100-0202-01 and 100-0202-02

Service Bulletin List

ECO/Service Bulletin Date
Number Incorporated Title

021017-1 Oct 21/02 XL246-A [Discrete Polarity Correction]

020607-2 Oct 21/02 XL246-S/A [Foam block QTY in IPC]
030225-1 Mar 11/03 XL246-A [Changed value of R21 in Control Board]
030729-4 Aug 05/03 XL246-A [Deleted irrelevant test procedures]
031216-2 Jan 12/04 Converted Document To Level 1 Troubleshooting

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List of Effective Pages

Pages affected by the last revision are indicated by an asterisk (*) adjacent to the date of the page.
Subject Page Date Subject Page Date
Title Page * TP1 18/01/02 10 16/11/21
* TP2 BLANK 11 16/11/21
12 16/11/21
Safety/ Warranty/ SWLA-1 16/11/21 13 16/11/21
Liability Advisory SWLA-2 BLANK 14 16/11/21
15 16/11/21
Record of * ROR-1 18/01/02 16 16/11/21
Revisions ROR-2 BLANK 17 16/11/21
18 BLANK
Temporary ROTR-1 16/11/21
Revisions ROTR-2 BLANK Fault Isolation 1001 16/11/21
1002 16/11/21
Service Bulletin SBL-1 16/11/21 1003 16/11/21
List SBL-2 BLANK 1004 BLANK

List of Effective * LEP-1 18/01/02 Maintenance 2001 16/11/21

Pages LEP-2 16/11/21 Practices 2002 16/11/21
2003 16/11/21
Table of TOC-1 16/11/21 2004 16/11/21
Contents TOC-2 16/11/21
TOC-3 16/11/21 Servicing 3001 16/11/21
TOC-4 BLANK 3002 BLANK
TOC-5 16/11/21
TOC-6 BLANK Installation and 4001 16/11/21
Storage 4002 16/11/21
Introduction Intro-1 16/11/21 4003 16/11/21
Intro-2 16/11/21 4004 16/11/21

System 1 16/11/21 Adjustment/Test 5001 16/11/21

Description 2 16/11/21 5002 16/11/21
3 16/11/21 5003 16/11/21
4 16/11/21 5004 BLANK
5 16/11/21
6 16/11/21 Inspection/Check 6001 16/11/21
7 16/11/21 6002 16/11/21
8 16/11/21 Cleaning/Painting 7001 16/11/21
9 16/11/21 7002 16/11/21
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List of Effective Pages

Pages affected by the last revision are indicated by an asterisk (*) adjacent to the date of the page.
Subject Page Date Subject Page Date
Repair 8001 16/11/21
8002 BLANK

Special Tools, 9001 16/11/21

Fixtures, and 9002 BLANK
Equipment

Illustrated Parts 10001 16/11/21

List (IPL) 10002 BLANK

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Table of Contents
INTRODUCTION ............................................................................................................................. 1
1. General Information........................................................................................................... 1
A. Introduction .............................................................................................................. 1
B. Revision Service ....................................................................................................... 1
C. Electrostatic Discharge ............................................................................................. 1
D. Abbreviations and Unit Symbols ............................................................................... 1
E. Applicable Publications ............................................................................................. 2
2. Product Support Services .................................................................................................. 2
SYSTEM DESCRIPTION ................................................................................................................. 1
1. Battery Overview ............................................................................................................... 1
A. Major advantages of the XL246-A ............................................................................ 1
2. General Description........................................................................................................... 2
3. Specifications .................................................................................................................... 3
4. Block Diagram Description ................................................................................................ 9
A. Introduction .............................................................................................................. 9
B. XL246-A Inputs......................................................................................................... 9
C. Battery Heater .......................................................................................................... 9
D. Electrical Load Budget............................................................................................ 10
E. Charging System .................................................................................................... 12
5. Battery Voltage Monitoring and Battery Cut-Off ............................................................... 13
6. Diagnostic and Safety Features....................................................................................... 13
A. Bite Test ................................................................................................................. 13
B. Battery Energy Batt Level Test ............................................................................... 13
C. Circuit Breakers ...................................................................................................... 14
D. XL246-A Outputs .................................................................................................... 14
E. Battery Capacity ..................................................................................................... 15
FAULT ISOLATION.................................................................................................................... 1001
1. Introduction ................................................................................................................. 1001
2. Test Equipment and Materials ..................................................................................... 1001
3. Pre-Power Resistance Check ...................................................................................... 1003
A. Check Steps ....................................................................................................... 1003
MAINTENANCE PRACTICES .................................................................................................... 2001
1. Battery Testing Interval ............................................................................................... 2001
2. Recommended Battery Replacement .......................................................................... 2001
3. Material Safety Data Sheets ........................................................................................ 2001
SERVICING ............................................................................................................................... 3001
INSTALLATION AND STORAGE ............................................................................................... 4001
1. General 4001
2. XL246-A as replacement for AMPS 2000 .................................................................... 4001
A. Mounting Tray .................................................................................................... 4001
B. New Mounting Tray Modification......................................................................... 4001

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Table of Contents
3. XL246-A Installation Preparation ................................................................................. 4003
A. Preparation ......................................................................................................... 4003
4. Storing the XL246-A .................................................................................................... 4003
A. Storage Equipment and Materials....................................................................... 4003
B. Storage Instructions............................................................................................ 4003
C. Preparing the Unit for Storage ............................................................................ 4004
D. Storage and Shipping Procedures ...................................................................... 4004
E. Monitoring Storage Conditions ........................................................................... 4004
ADJUSTMENT/TEST ................................................................................................................. 5001
1. General 5001
2. Maintenance Philosophy ............................................................................................. 5001
3. Battery Capacity and BITE TEST Interval .................................................................... 5001
A. On-Aircraft Battery Capacity Test Procedure (Using BATT LEVEL TEST Switch)5001
4. On-Aircraft BITE TEST Procedure............................................................................... 5001
5. Fault Indication ............................................................................................................ 5002
6. Shop Level Charging Test ........................................................................................... 5002
A. Test Equipment For Shop Level Charging .......................................................... 5002
B. Shop Level Charge Test Procedures .................................................................. 5002
C. Shop Level Capacity Test - Equipment Required ............................................... 5003
D. Shop Level Battery Capacity Discharge Test Procedures ................................... 5003
INSPECTION/CHECK ................................................................................................................ 6001
1. Introduction ................................................................................................................. 6001
2. Equipment and Materials ............................................................................................. 6001
3. General Check Procedures ......................................................................................... 6001
A. External Visual Checks....................................................................................... 6001
4. Aircraft Level Checkout, Existing Installation ............................................................... 6001
CLEANING/PAINTING ............................................................................................................... 7001
1. Introduction ................................................................................................................. 7001
2. Cleaning Equipment and Materials .............................................................................. 7001
3. General Cleaning Practices ......................................................................................... 7001
A. Practices ............................................................................................................ 7001
4. General Cleaning Procedures ..................................................................................... 7002
A. External Cleaning ............................................................................................... 7002
REPAIR ..................................................................................................................................... 8001
SPECIAL TOOLS, FIXTURES, AND EQUIPMENT .................................................................... 9001
1. Shop Test Equipment .................................................................................................. 9001
ILLUSTRATED PARTS CATALOG (IPL) ................................................................................. 10001

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List of Figures
Figure 1: XL246-A Emergency Battery............................................................................................. 1
Figure 2: XL246-A Emergency Battery Pack Dimensions ................................................................ 5
Figure 3: J1 Signal Pin Nomenclature .............................................................................................. 6
Figure 4: XL246-A Controls and Indicators ...................................................................................... 7
Figure 5: XL246-A Functional Block Diagram ................................................................................ 11
Figure 6: Battery Energy Management .......................................................................................... 14
Figure 7: XL246-A 6 Amp Constant Current Discharge .................................................................. 16
Figure 8: XL246-A 200 Watt Constant Power Discharge (New Battery) ......................................... 16
Figure 9: XL246-A 11.5 Amp Constant Current Discharge (New Battery) ...................................... 17
Figure 4001: Typical ARINC 404A Rack ...........................................................................................4002
Figure 9001: Bench Charge Harness................................................................................................9001

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List of Tables
Table 1: Applicable Publications ..................................................................................................... 2
Table 2: XL246-A Specifications ..................................................................................................... 3
Table 2: XL246-A Specifications - continued .................................................................................. 4
Table 3: XL246-A Pin Nomenclatures ............................................................................................. 6
Table 4: XL246-A Controls and Indicators ...................................................................................... 8
Table 1001: Test Equipment and Materials .....................................................................................1001
Table 1002: General Troubleshooting Guide ...................................................................................1002
Table 1003: J1 Connector Pins Resistance Readings .....................................................................1003
Table 4001: Storage Equipment and Materials ................................................................................4003
Table 7001: Cleaning Equipment and Materials ..............................................................................7001

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INTRODUCTION
1. General Information
A. Introduction
This Aircraft Maintenance Manual (AMM) contains the description and theory of operation for
the XL246-A series Emergency Battery System. Material Data Safety Sheets are provided in
the Maintenance Practices section.
B. Revision Service
This publication is written in agreement with the Air Transport Association of America iSpec
2200. A revised manual is issued when necessary throughout the service life of the unit.
Revisions are summarized on the Transmittal Sheet page.
C. Electrostatic Discharge
The items susceptible to electrostatic discharge are handled in agreement with IPC-A-610.
Refer to the IPC-A-610C specification Sections 3.2 and 3.3 for the definition of the standards
and conditions.
D. Abbreviations and Unit Symbols
Abbreviations, mnemonics, and unit symbols used in this manual are defined below. The
following standards and conventions are used in this manual:
(1) The symbols and special characters are used in agreement with IEEE publication 260
and IEC publication 27, except special mnemonics contained in the text, which are
spelled out.
(2) The signal mnemonics, unit control designators, and test designators are printed in
capitals.
(3) The measurements, weights, dimensions, the pressure or torque values (changed to
metric equivalents) are shown in parentheses after the United States measurements.
(4) Temperature is shown in degrees Fahrenheit (°F). Celsius (centigrade) is represented by
the (°C) symbol.
Acronyms,
Abbreviations, Description
and Terms
ATR Austin Trumbull Radio Racking
CAGE Civilian and Government Entity
SLA Sealed Lead Acid
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers
IRS Inertial Reference System

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Part Numbers: 100-0202-01 and 100-0202-02
E. Applicable Publications
Related publications applicable to the XL246-A are shown in Table 1.
Table 1: Applicable Publications
Securaplane Document Number
Top Assembly Drawing, XL246-A 101-0202-01
Product Specification 200-0202-01
Functional Test Procedure 215-0202-01
Service Manual for XL246-A Emergency Battery SM-0007-01
Commercial Document Number
Environmental Conditions and Test Procedures For Airborne RTCA/DO-160C
Equipment
Institute for Interconnecting and Packaging, Acceptability of Electronic IPC-A-610C
Assemblies
2. Product Support Services
Product support for the XL246-A Series Emergency Battery System is available from Securaplane.
These services include repair, overhaul, spare parts, and technical documentation. Please contact:
Securaplane Technologies Inc. CAGE Code: 0TMJ9
12350 N. Vistoso Park Rd. Tel: 1-520-297-0844
Oro Valley, AZ 85755 Fax 1-520-498-4924
Email: support@securaplane.com Web: www.securaplane.com

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SYSTEM DESCRIPTION
1. Battery Overview
The Securaplane XL246-A provides an improved, minimal maintenance, direct replacement battery
for the URDC AMPS 2000.
A. Major advantages of the XL246-A
(1) Use of aviation-proven Hawker Sealed Lead Acid batteries (classified as dry cells) rather
than Nickel-Cadmium batteries as used in the AMPS 2000.
(2) Use of total low-loss, solid-state switching rather than mechanical relays
(3) Advanced diagnostics that preclude the need to remove the unit to test battery capacity
(4) There are two XL246-A models:
a. The –01 Model has a 15-amp circuit breaker
b. The –02 Model a 10-amp circuit breaker

Figure 1: XL246-A Emergency Battery

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2. General Description
The XL246-A Emergency Battery Pack consists of a 24 VDC Hawker Sealed Lead Acid Battery
(actually two 12 VDC batteries in series), a charge management system, a battery heater system,
and a logic controlled solid-state switching system. The 18.63 lb XL246-A is contained in a ½ ATR
(short) chassis.
The XL246-A can provide 19 to 24 VDC at 6 amperes for a minimum of one hour, or for example, it
can drive a 200-watt load (2.9 ohms) for 45 minutes. These outputs are based on the batteries
being at a normal operating temperature (i.e., heater controlled) temperature of (60°F (15°C) or
greater).
The charging system can recharge a cold, discharged battery to an 80-90% energy level in one
hour, providing the aircraft’s 28 VDC system furnishes an initial current of 12 amperes (for the first
2-3 minutes). The operator does not need to cycle aircraft electrical power to induce the unit to
charge. The charge management system maintains the battery in a charged state whenever bus
power is supplied to the unit. Cycling power to the XL246-A is not recommended.
The XL246-A is designed for minimum maintenance. The unit does not need to be removed from
the aircraft except for an outright failure (which can be determined while installed), or preventative
maintenance battery replacement at the end of the unit’s service life.
The unit self-determines if a failure occurs in the battery system, charging system, or battery heater
system. Additionally, a front panel BATT LEVEL TEST pushbutton tests battery capacity. A second
pushbutton, Bite Test (Built In Test Equipment), tests various XL246-A circuits so that it is not
necessary to remove the unit to confirm that it is functioning properly.
The XL246-A battery heater system activates when the battery temperature is below 60°F (15°C).
The 70-watt heater blanket is supplied energy from the aircraft 28 VDC bus. It consumes
approximately 2.1 amps of the maximum current draw (6 amperes) specified above. The heater is
automatically controlled by an electronic thermostat. There is also an electro-mechanical
thermostat “safety valve” that discontinues the heating process if the electronic thermostat fails in
the “ON” position.
To be directly compatible with the URDC AMPS 2000, the XL246-A automatically switches (solid-
state) from the aircraft 28 VDC BUS to the 24 VDC battery when the aircraft BUS voltage drops
below approximately 20 VDC. The XL246-A is designed to pre-filter and automatically switch either
the aircraft 28 VDC or the battery 24 VDC to the essential equipment outputs.

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3. Specifications
Table 2 presents the specifications for the XL246-A Emergency Battery Pack.
Table 2: XL246-A Specifications
Parameter Specifications
Input
Voltage 20-35 VDC (28 VDC nominal)
Current 14.1 Amps (maximum) 1
Current: Battery Heater 2.1 Amps (11.6 ohms)
Current: Charger 12 Amps (short term peak)
Current: Switched 15 Amps (Model –01) 10 Amps (Model –02)
Connector DPXBMA-D8P-34B
Connector, Mating DPXBMA-D8S-33B
Connector, Keying Pin 7 on Model –01 (15A); Pin 12 on Model-02 (10A)

Outputs
Battery Output 19 – 24 VDC
Battery Current 20 Amps (maximum)
Battery Duration 19.5 VDC Cutoff
(New Unit @23°C) • 6 Amps: 1 hour minimum
• 200 W load: (2.9 ohms) 45 minutes minimum
• 11.5 Amps: 27 minutes minimum
• 15 Amps: 21 minutes minimum
Fault Output 500 mA sink (maximum)
Battery On Output 160 mA source (maximum)

Battery Heater
Voltage 28 VDC (from A/C Bus)
Current 2.1 Amps (when on) 2
Resistance 11.6 ohms

Operating Temp Range Normal operating temperature -55°C to +71°C 3

Physical
Height 07.70 inches (19.55 cm) maximum
Width 04.83 ±.03 inches (12.27 cm) nominal
Length 14.37 inches (36.49 cm) maximum
Weight 18.63 lb (8.45 kg) maximum

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Table 2: XL246-A Specifications - continued
Parameter Specifications
Environmental Refer to XL246-A Product Specification, 200-0202-01
NOTES: 1. A dead battery may cause 12 amps of initial current for approximately 20-30
seconds. An additional 2.1 amperes of heater current results in a total of 14.1
amperes.
2. On is a battery temperature below 60°F (15°C); Off is battery temperature
above 60°F.
3. Battery is specified by the manufacturer to 65°C; however, 71°C will not cause
damage.

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Figure 2: XL246-A Emergency Battery Pack Dimensions

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The electrical interface and connector information is shown in Figure 3: J1 Signal Pin
Nomenclature.

XL246-A

J1

1 No Charge (Fault) Output

2 Charge Inhibit Input

3 Spare

4 Battery On Output

5 +28VDC In

6 Input Power Gnd

7 Output Power Gnd

8 Batt (24VDC) Power Out

Figure 3: J1 Signal Pin Nomenclature

Table 3: XL246-A Pin Nomenclatures

Conn. Name Characteristics Source
J1-1 No Charge (Fault) Output Logic (Active = Ground) XL246-A
J1-2 Charge Inhibit Input Logic (Active = 28 VDC) Aircraft
J1-3 Spare ---- ----
J1-4 “Battery On” Output Logic (Active = 28 VDC) XL246-A
1
J1-5 28 VDC In 12 Amps Maximum Aircraft
J1-6 Input Power Ground Ground ----
J1-7 Output Power Ground (Internally tied to pin 6) ----
J1-8 Battery (IRS) Power Out 15 Amps; Model-01 (or XL246-A
10 Amps; Model–02) Maximum
NOTES: 1. A dead battery may cause 12 amperes of initial current for approximately 20-
30 seconds. An additional 2.1 amperes of heater current results in a total of
14.1 amperes.

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Figure 4: XL246-A Controls and Indicators

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Table 4: XL246-A Controls and Indicators
Reference Designator Function
Output Breaker 15 Amps for Model -01 (10 Amps for Model-02) Circuit Breaker
for Battery Out.
Chr’g -fault- Charger Fault illuminates red when charger has a fault or if a
fault occurs during a BITE test.
Cell(s) -fault- Battery Cell(s) Fault illuminates when the battery pack
comparison logic detects a battery cell failure fault or if a fault
occurs during a BITE test.
Bite Test Pressing and holding the Bite Test pushbutton starts the Built
In Self-test that loads a fault causing the CHR’G and CELL(S)
LEDs to momentarily illuminate and then tests the functionality
of the charger and the battery. See Bite Test.
Batt Level Test Pressing and holding the Batt Level Test for five seconds,
loads the heater blanket across the battery for five seconds
and roughly indicates battery capacity on one of three LEDs.
This test is valid after aircraft power has been off for more than
one hour. See Battery Energy Batt Level Test.
Green LED Green LED indicates 75 to 100 per-cent of battery energy is
available.
Yellow LED Yellow LED indicates 50 to 75 per-cent of battery energy is
available.
Red LED Red LED indicates 0 to 50 per-cent of battery energy is
available.
HEATER On Green LED illuminates whenever the Batt Level Test or heater
control is driving current through the heater blanket.

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4. Block Diagram Description

A. Introduction
This section provides a block diagram description and a functional description of the XL246-A
Emergency Battery Pack. Refer to Figure 5 throughout the block diagram description.
The XL246-A provides emergency back-up power (19-24 VDC @ 6 AH) to essential aircraft
equipment when experiencing loss of aircraft 28 VDC, which normally powers the essential
equipment. The XL246-A provides noise filtering for the equipment, whether powered by the aircraft
28 VDC or the emergency battery.
B. XL246-A Inputs
(1) Charger Inhibit (J1-2)
The charger inhibit function
c. Sheds loads from the aircraft 28 VDC power system, or
d. Suspends battery charging while a connected device (i.e., inertial reference system)
conducts a self-test that includes testing the output capability of the XL246-A.
Charger Inhibit is activated by applying 28 VDC continuously to the INHIBIT pin J1-2 during the
inhibit period. This action de-activates the Bulk Charge path, the Precision Charge path, and
the Heater path. The charger inhibit function should not be used any more than necessary, as it
precludes recharging the unit after discharge.
C. Battery Heater
The XL246-A incorporates a 70-watt heater blanket that maintains the battery at a temperature of at
least +60°F (15°C). This temperature ensures that the battery is capable of holding at, or near, its
rated capacity.
The heater blanket is electronically controlled by solid state switches in series with the heater. The
battery heat management thermal sensor is also inserted in series with the heater blanket.
For safety purposes, a redundant, high-reliability electro-mechanical thermal switch is inserted in
series with the battery heater. This normally closed switch, opens at 165°F (74°C), and closes at
115°F (46°C).
The battery heat management thermal sensor and electro-mechanical thermal switches are located
within cavities formed in the battery pack when the two 12 VDC batteries are assembled bottom to
bottom. The heater blanket is wrapped around the exterior of the joined battery housings.
A heater monitor circuit is included in the BITE circuitry. It confirms appropriate operation of the
heater system by verifying that heater current flows when heating is required. If heater current does
not flow, the FAULT output is asserted. Refer to Section D. (1.) for fault information.
A green HEATER ON LED illuminates whenever the heater is on (i.e., when the battery is below
60°F (15°C)). The HEATER ON LED also illuminates when the BATT LEVEL TEST is active,
because the heater blanket is used as the battery test load.

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D. Electrical Load Budget
The XL246-A 28 VDC electrical load demand from the aircraft is 14.1 amperes maximum. This
represents an initial current demand where 12 amps is used for bulk charging a flat battery and 2.1
amperes is used for the heater blanket if the battery ambient temperature is below 60°F (15°C).
After the first 30 seconds, the charge current decreases to less than 10 amps. When the battery is
fully charged, the charge current decreases to less than 200 milliamperes (excluding heater current).

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Figure 5: XL246-A Functional Block Diagram

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E. Charging System
The XL246-A uses constant current voltage charging methods to recharge the battery pack.
The battery pack draws current in proportion to the voltage difference between the battery and
applied power source. Thermal runaway, a drawback of nickel-cadmium battery technology
when charging with a non-current limited power source, does not occur.
Recharging is accomplished in two modes:
• Bulk mode
• Precision charge mode
(1) Bulk Charge Mode
a. Bulk Charge mode provides a large amount of current to the battery directly from the
aircraft 28 VDC bus (through a low-loss solid state switch). Bulk charging may
momentarily (less than 30 seconds) draw 10 to 12 amps when recharging a flat
battery pack. An additional 2.1 amperes will be drawn if the heater blanket is on
(ambient temperature <60°F). As the battery charges, the current draw decreases to
less than 200 milliamperes. The Bulk Charge mode is active for the first 15 minutes
after bus power is applied to the XL246-A.
b. At Bulk Charge termination, the XL246-A switches from the Bulk Charge mode to
Precision Charge mode.
(2) Precision Charge Mode
a. Precision Charge mode maintains a (temperature-compensated, based-on-battery-
temperature) float charge voltage in accordance with the battery manufacturer’s
specifications. The voltage may differ from the aircraft bus voltage by a one or two
volts. Precision Charge mode can supply up to 7.5 amps to the battery. Input current
to the XL246-A reduces to less than 200 milliamperes when maintaining a float
charge upon the charged battery pack.
b. The battery will reach a 90% charged state (from a fully discharged state) in less than
one hour.

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5. Battery Voltage Monitoring and Battery Cut-Off

The two 12 VDC batteries in series are voltage compared. Battery comparison is an effective
means of detecting a bad, shorted, open, or partially defective cell(s).
In addition to battery voltage comparison, the overall battery (24 VDC) level is also monitored for
proper level. To prevent the batteries from being deep discharged, and thus face the risk of
sulfating and shortening battery life, the battery output is shut off at a pre-determined level
depending on average current drain. The cut-off point varies between 19 and 22 VDC. This point is
consistent with 96-98% energy removal, thus there is negligible energy loss sacrificed for the
significant increase in battery reliability.
CAUTION: IMMEDIATELY FOLLOWING AN EMERGENCY POWER TOTAL DISCHARGE, 28
VDC POWER MUST BE PROVIDED TO THE XL246-A TO RECHARGE THE
BATTERY. THE BATTERIES DO NOT REQUIRE A COOL DOWN PERIOD PRIOR
TO RECHARGING (AS DO NICKEL-CADMIUM BATTERY TECHNOLOGY) AFTER
USAGE.
NOTE: If the XL246-A battery pack will not take a full charge after being left discharged, the
batteries may have become sulfided. In this case, the battery pack may need to be
replaced.
6. Diagnostic and Safety Features
The XL246-A provides front panel switches and LEDs to determine and indicate battery capacity
and the XL246-A’s operational integrity through Built-In-Test-Equipment (BITE).
A. Bite Test
The XL246-A BITE circuitry is active whenever CB-1 is closed, whether aircraft bus power is
present or not. When the BITE TEST pushbutton is pressed and held, test circuitry exercises
the circuits that monitor battery cell conditions and the battery charge management conditions.
Both the CHRG’R and CELL(S) LED’s illuminate verifying that the introduction of a false fault
into the BITE circuits was detected and reported.
When the Bite Test switch is depressed the Fault output provides a Fault output signal. Refer
to Fault Output (J1-1).
B. Battery Energy Batt Level Test
Owing to the nature of sealed lead acid batteries, it is possible to measure the energy content
of a battery while it is still installed in the airplane (as opposed to Nickel-Cadmium batteries).
Simply press the Batt Level Test pushbutton to engage the battery energy test circuitry in the
XL246-A.
When the Batt Level Test pushbutton is pressed, logic performs a qualitative test (green,
yellow, or red LED) of the battery energy available. In contrast to Ni-Cad batteries, sealed lead
acid batteries can be checked for energy when voltage is measured under a known constant
load. The energy level accuracy can be within five percent when the energy test is conducted
60 minutes or more after external 28 VDC is removed from the XL246-A. An optimum time to
conduct this test is before applying electrical power to the aircraft at the start of maintenance
or preflight operations.

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When the BATT LEVEL TEST button is pressed and held, the XL246-A connects the battery to
the heater load (70 watts) and measures battery energy. The green HEATER ON LED
illuminates, indicating that current is flowing through the heater blanket. The battery energy is
determined by measuring the voltage across a constant load (the heater blanket).

Figure 6: Battery Energy Management

As shown in Figure 6 the battery level indication is via three (green, yellow, and red) LEDs.
The energy values are:
• Green = 75-100%
• Yellow = 50-75%
• Red = 0-50%
The effect of ambient temperature on the battery’s energy content is included in the indication.
For example, a fully charged battery sitting in a minus 20°C ambient temperature, loses 20-
25% energy due to the cold temperature. This reduction is accounted for (included) in the
energy test.
C. Circuit Breakers
As shown in Figure 5 there is one circuit breaker (CB-1) on the XL246-A front panel that limits
the output current. CB1 is 15 Amps for the Model -01 XL246-A and 10 Amps for the Model-02.
D. XL246-A Outputs
(1) FAULT Output (J1-1)
A FAULT output (sink-to-ground) discrete closes if a failure occurs in the charger, heater,
or battery. This discrete line is normally open through an NPN transistor. It is grounded to
report a failure to the aircraft’s fault monitoring system.
Should a fault condition occur during flight, the XL246-A will still pass bus power and
provide battery power in response to a subsequent emergency. Removal of an XL246-A
is interpreted by the aircraft fault monitoring system as a fault.
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(2) Direct Battery Out (IRS) (J1-8)
The XL246-A provides a non-logic controlled direct output that provides up to 15 amps of
battery current. A 15 amp circuit breaker (Model–01) is in series with the battery output;
or a 10 amp circuit breaker for (Model–02). A low-voltage solid-state switch is also in
series with the output; however, it is closed until the battery voltage reaches the cut-off
point described in Section 5.
Aircraft 28 VDC is routed through the input noise filter, a blocking diode, and through a
solid state switch and output filter to the Direct Battery Output.
(3) Battery ON Output (J1-4)
Battery ON output occurs when the battery is being drained by greater than 350 mA. The
Battery ON output signal is a 28 VDC signal limited to 160 mA MAX. The Battery ON
detector circuit includes a time constant so that momentary load transients do not cause
unnecessary cockpit concern.
E. Battery Capacity
The XL246-A battery is nominally rated at 6.0 amps for a one hour rate at 24 VDC. The IRS
output (P1, pin 8) on the XL246-A provides a direct output path through an electronic switch
for the battery. Figure 7 shows the output curve for a constant 6.0 amp discharge of a fresh
battery set. Output control switches provide a nominal half volt drop between the battery and
the essential equipment outputs. A battery set is considered at the end of its service life when
it is unable to drive a 6 ampere load for more than 45 minutes.
The XL246-A is able to power 200 watt requirements for a minimum of 30 minutes to satisfy
FAA Emergency Power Requirements for flight instruments. See Figure 8. Conversely, the
XL246-A provides a maximum sustained 11.5 amps for meeting FAA In-flight Emergency
Power Requirements. See Figure 9.

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Figure 7: XL246-A 6 Amp Constant Current Discharge

Figure 8: XL246-A 200 Watt Constant Power Discharge (New Battery)

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Figure 9: XL246-A 11.5 Amp Constant Current Discharge (New Battery)

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FAULT ISOLATION
1. Introduction
This section contains procedures required to identify a faulty XL246-A.
WARNING: BEFORE THE EQUIPMENT CALLED OUT IN THIS PUBLICATION IS USED,
UNDERSTAND THE HANDLING PRECAUTIONS RECOMMENDED BY THE
MANUFACTURERS OR SUPPLIERS. FAILURE TO OBEY THE
MANUFACTURERS’ OR SUPPLIERS’ RECOMMENDATIONS CAN RESULT IN
PERSONAL INJURY. REFER TO THE MSDS.
CAUTION: THIS UNIT CONTAINS AN ASSEMBLY THAT IS SUSCEPTIBLE TO DAMAGE
FROM INCORRECT HANDLING. DO NOT DROP OR HIT THE UNIT DURING
THESE PROCEDURES.
CAUTION: THIS UNIT CONTAINS COMPONENTS THAT CAN BE DAMAGED BY
ELECTROSTATIC DISCHARGE. THESE PROCEDURES MUST BE
PERFORMED AT A STATIC-FREE STATION.
2. Test Equipment and Materials
(1) Table 1001 shows the equipment and the materials necessary to complete the
tests.Equivalent substitutes may be used.
Table 1001: Test Equipment and Materials
Equipment/Materials Description/Manufacturer
Test Adapter Cable (See Figure 9001) Securaplane
Digital Voltmeter 1% accuracy Fluke 87 or equivalent
Digital Ohmmeter 1% accuracy Fluke 87 or equivalent
Needle (fine point) probe for volt meter Commercially available

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(2) Table 1002. General Troubleshooting Guide presents a concise, Level One
troubleshooting guide for the XL246-A.
Table 1002: General Troubleshooting Guide
System Possible Cause Remedy
A/C devices powered 1. XL246-A installation 1. Verify XL246-A is installed.
by XL246-A not on errors. Check electrical connector for
2. Check for power at bent pins.
device. 2. A/C wiring check.
3. If device switches off, 3. Check for circuit overload or
after being on. wiring short. Reset XL246-A.
4. Devices on one output 4. Check for open A/C wire.
circuit not on at all. Otherwise, send to repair shop.
XL246-A won’t charge 1. Aircraft input circuit 1. Close circuit breaker.
breaker open.
2. Inhibit line active (28 2. Reset inhibit control switch on
VDC). system.
3. No 28 VDC power to 3. Check for broken A/C wire.
connector J1B, Pin 5.
XL246-A won’t turn on 1. Check CB-1 on XL246-A. 1. Open and set CB-1.
2. Check control switches. 2. Repair, replace as necessary.
3. A/C wiring fault. 3. Repair, replace as necessary.
ON annunciator not on 1. Annunciator lamps out. 1. Check and replace as required.
when XL246-A is on
XL246-A fault reported 1. 1. CHG’R LED 1. & 2. Reset CB-1 and A/C
to cockpit fault display illuminated. breaker at same time.
2. CELL(S) LED illuminated. Conduct BITE TEST. If LED
still on, send to repair shop.
3. A/C wiring fault. 3. Check/fix A/C wiring.
HEATER ON LED not 1. Battery pack above 60°F 1. No problem.
illuminated. (15°C).
2. Fault within XL246-A. 2. Determine if heater LED turns on
while BITE is engaged.
If yes, no problem.
If no, send to repair shop.
Circuit breaker on 1. A/C output circuit 1. Troubleshoot respective output
XL246-A front panel shorted. circuit and connected devices.
trips open.
2. Output circuit within 2. Reset CB and retest. If fault
XL246-A damaged. within XL246-A, send to repair
shop.

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Table 1002: General Troubleshooting Guide - continued
System Possible Cause Remedy
Battery Level Test- 1. Battery not fully charged. 1. Charge battery for 2 hours and
Yellow LED on. repeat level test. If same result,
schedule battery replacement at
next maintenance period.
Battery Level Test- 1. Battery not charged or is 1. Charge battery for 2 hours and
Red LED on. defective. repeat level test. If same result,
send to repair shop.

3. Pre-Power Resistance Check

A. Check Steps
(1) Pull the Output Breaker on the XL246-A.
(2) Using an ohmmeter, verify the resistance readings in Table 1003.
Table 1003: J1 Connector Pins Resistance Readings
Neg Probe Pos Probe Meter Reading Signal
J1-6 Chassis <1.0 Ω -
J1-6 J1-1 >100 KΩ No Charge Fault
J1-6 J1-2 >100 KΩ Inhibit
J1-6 J1-3 >100 KΩ Spare
J1-6 J1-4 >100 KΩ Batt On
J1-6 J1-5 >100 KΩ A/C 28 VDC Bus
J1-6 J1-6 <1.0 Ω Input Gnd
J1-6 J1-7 <1.0 Ω Output Gnd
J1-6 J1-8 >100 KΩ Batt 24 VDC Out

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MAINTENANCE PRACTICES
1. Battery Testing Interval
Run the On-Aircraft Battery Capacity Test Procedure (Using the BATT LEVEL TEST Switch) at least
once every year. Refer to Adjustment/Test.
2. Recommended Battery Replacement
The battery manufacturer, Hawker states that a properly- maintained sealed lead-acid battery in a
non-hostile environment can live for up to eight years in a total stand-by (float) application. A total
float is when the battery is sitting 24 hours per day with a charge voltage applied similar to a
computer back-up application. Since an airplane is not totally a float application nor a totally cycling
application, Securaplane considers four years to be an average life span for an XL246-A battery.
It is in the Customer’s best interest, to replace the batteries (two in each XL246-A) in the fourth
year as a Preventative Maintenance activity, and thus prevent an unscheduled maintenance event.
In an effort to promote scheduled replacement, Securaplane has instituted an appealing battery
replacement price (call for quote).
3. Material Safety Data Sheets
The following pages present the MSDS for the Hawker Energy Sealed Lead Battery.

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SERVICING

Not Applicable

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INSTALLATION AND STORAGE

1. General
This section describes procedures to install and store the XL246-A.
NOTE: See Testing and Fault Isolation to determine the condition of the XL246-A.
2. XL246-A as replacement for AMPS 2000
The XL246-A is a direct replacement for the URDC AMPS 2000. However, the XL246-A weighs 2
pounds more than the AMPS 2000 because Sealed Lead Acid batteries weigh approximately 15
percent more than equivalent NI-CAD batteries as used in the AMPS 2000.
A. Mounting Tray
The XL246-A is designed to mount in an ARINC type ½ ATR 404A or equivalent (i.e., L404A-
50-S-1/DPXB-0) tray. See Figure 401. In applications where the XL246-A is a direct
replacement for an AMPS 2000, if the interchangeability is covered by an STC or TC, the
replacement will normally allow using the same tray as the AMPS 2000.
The XL246-A fits any ½ ATR tray designed to receive the AMPS-2000.
NOTE: Inspect an existing AMPS-2000 mounting tray for physical integrity before installing
the XL246-A.
For new applications a tray should be selected that is consistent with the particular aircraft
structural (loads) requirement. The XL246-A was FAA DO-160A approved for vibration per
curve “R”, sinusoidal (i.e., 5g, 5-350HZ, and 10G, 350-2000HZ). It was “shock” and “crash
safety” approved per DO-160C sections 7.2 and 7.3.1. A Barry mounting tray (R404A-4-R-
A/DPXB-1200, or equivalent) is a more robust redesign of the older light weight 404A. This
tray has sufficient strength to operate in installations that would require high “g” (i.e., 5-10g)
compliance.
B. New Mounting Tray Modification
The AMPS-2000 and XL246-A require modification to a standard ½ ATR mounting tray, such
as the Barry 404A-50-X010 (or equivalent), before they can be installed in the aircraft. The
back panel of the tray must be relocated upward such that the center bolt holes for the tray
electrical connector are 1.150 +/- .005 above the tray. Contact Securaplane for assistance
when installing the XL246-A in new applications.

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Figure 4001: Typical ARINC 404A Rack

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3. XL246-A Installation Preparation

CAUTION: MAKE CERTAIN THAT THE INSTALLATION DESIGN PRECLUDES THE XL246-A
FROM FEEDING A LOAD WHEN ALL AIRCRAFT POWER IS OFF, OTHERWISE
THE BATTERY COULD DISCHARGE TO ZERO CAPACITY.
A. Preparation
(1) Remove the XL246-A from its shipping container.
(2) Close CB-1.
(3) Verify BITE status LED’s are not illuminated.
(4) Run a battery capacity test by holding the BATT LEVEL TEST button in for five seconds.
Verify that the HEATER ON LED illuminates and the green energy level LED illuminates.
NOTE: If the red LED or the yellow LED illuminates before seven seconds, a bench
charge is needed before installing the XL246-A in the aircraft. Refer to Shop
Level Charge Test Procedures.
(5) Open CB-1. Install the XL246-A in the battery rack and tighten the J hooks.
(6) Proceed with the aircraft installation. Go to Aircraft Level Checkout, Existing Installation.
4. Storing the XL246-A
A. Storage Equipment and Materials
Table 4001 shows the equipment and materials necessary to prepare the unit for storage.
Equivalent equipment/materials can be used.
Table 4001: Storage Equipment and Materials
Equipment/Materials Manufacturer
Barrier material MIL-B-131B
Cloth Commercially available
Dehydrating agent MIL-D-21576
B. Storage Instructions
(1) The presence of certain environmental conditions during storage can cause damage to
parts. Some of these conditions are:
a. Moisture
b. High temperature (over 125°F)(52°C)
c. Fuel or solvents
d. Fumes that can cause corrosion
e. Mechanical stresses
f. Ultraviolet light
g. Localized electromagnetic fields
NOTE: This is not an inclusive list of conditions that can inflict damage.
(2) Parts that have been stored where these conditions may be present must be examined
for damage and replaced as necessary.

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C. Preparing the Unit for Storage
NOTE: If the red LED or the yellow LED illuminates before seven seconds, a bench charge
is needed before installing the XL246-A in the aircraft. Refer to Shop Level Charge
Test Procedures.
(1) Clean the external surfaces with a clean, lint-free cloth.
(2) Put a protective cap on the connector.
(3) Wrap the unit in barrier material.
(4) Place cushions at the sharp corners to prevent damage to the barrier material and pack
the container with the dehydrating agent. Enclose the prepared part in the applicable size
barrier material.
D. Storage and Shipping Procedures
(1) Always store or ship the XL246-A with CB-1 pulled.
(2) Perform a battery capacity test at least every 90 days using the BATT LEVEL TEST
switch. CB-1 must be engaged for the test. If a red or yellow LED indicator is illuminated,
continue to the Shop Level Charging Test in the ADJUSTMENT/TEST section.
(3) Use the Securaplane shipping box or equivalent.
(4) Always include a failure report including aircraft type and serial number.
E. Monitoring Storage Conditions
(1) Keep the unit in an area away from high temperatures, dust, moisture, and fumes that
can cause corrosion.
(2) Do not store the XL246-A above 85°F (30°C) as it accelerates self-discharge and reduces
battery life.
(3) The recommended storage temperature is less than 100°F (38°C) and must not be more
than 125°F (52°C).
(4) Control humidity to prevent moisture contamination of the unit.

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ADJUSTMENT/TEST
1. General
This section describes procedures to test XL246-A. Adjustments are not required on this unit.
2. Maintenance Philosophy
The XL246-A does not need to be removed from the aircraft to perform BITE or CAPACITY testing.
These tests can be run using the XL246-A front panel pushbuttons and indicators. For shop level
tests, however, the XL246 does need to be removed from the aircraft.
3. Battery Capacity and BITE TEST Interval
It is recommended that the BITE and CAPACITY tests be performed at least once a year. The tests
can be performed, while the unit is installed in the aircraft, by pressing the front panel BITE TEST
pushbutton.
A. On-Aircraft Battery Capacity Test Procedure (Using BATT LEVEL TEST Switch)
(1) Ensure that the XL246-A has a maximum charge before testing. This would be assured if
the aircraft just returned from a two-hour flight, or if the aircraft 28 VDC Bus had been ON
for two hours.
(2) The aircraft needs to sit, with the 28 VDC OFF (not feeding the XL246-A), for more than
one hour (accuracy increases with time) in an ambient temperature of 65° to 90°F,
directly after the two-hour charge time described in step (1).
(3) Depress and hold the BATT LEVEL TEST switch for approximately five seconds. At the
end of five seconds a green, yellow, or red LED will be illuminated. The colors indicate:
• Green = approximately 75-100 percent of (as new) capacity remains
• Yellow = approximately 50-75 percent of (as new) capacity remains
• Red = approximately 0-50 percent of (as new) capacity remains
A red or yellow LED indicates insufficient charge time existed or the battery is weak and
should be replaced.
NOTE: This Battery Level Test is a coarse indication of battery capacity remaining
based on the original as-new condition of the battery. The BATT LEVEL TEST
does not address run time for any airplane load. This must be sized by the
installation agency. A more accurate capacity test is described in Shop Level
Charging Test Procedures.
4. On-Aircraft BITE TEST Procedure
Depress the BITE TEST pushbutton and hold. Both the CHRG’R and CELL(S) LED’s should
illuminate verifying that the introduction of a false fault into the BITE circuits was detected and
reported. When the BITE TEST switch is depressed the FAULT output also furnishes a FAULT
output signal. Refer to FAULT Output (J1-1).

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5. Fault Indication
Any fault detected in the battery, charger, or heater system will result in a fault output activation
and cause the CHRG’R or CELL(S) LED to illuminate, depending on which has failed. A fault in the
heater will be confirmed by the HEATER ON LED not lluminating when the BATT LEVEL TEST is
activated.
NOTE: The aircraft 28 VDC must be ON to illuminate the CHRG’R, CELL(S), or HEATER ON
LED, except when performing manual tests, in which case the battery provides energy to
illuminate the BATT LEVEL TEST, CHRG’R, CELL(S) and HEATER ON LEDs.
6. Shop Level Charging Test
NOTE: Always disconnect aircraft 28 VDC and pull the XL246-A CIRCUIT BREAKER before
removing the XL246-A from its mounting rack.
A. Test Equipment For Shop Level Charging
NOTE: You may use the URDC 221TF101-01 test if you have one. If you do, make certain
the test set is in the normal charge mode, and NOT in the trickle charge mode.
(1)
Bench Charge Harness - This can be a simple two wire (use wire size AWG 16 or 18)
harness with female mating pins to connect to the XL246-A pins. See Figure 9001.
NOTE: Securaplane offers a ready-made mating connector harness for charging and
discharging the battery. Call Securaplane for information.
(2) A 28 VDC power supply capable of 20 amperes output.
(3) A digital 1% VOM.
(4) An ammeter capable of indicating 15 amperes. An ammeter integral to the 28 VDC power
supply is ideal.
B. Shop Level Charge Test Procedures
(1) Ensure that CB-1 is pulled.
(2) Connect the 2-wire harness or Securaplane Connector harness (see Figure 901) to
P1B-5 (+28 VDC) and P1B-6 (GND).
(3) Connect the other ends of the wires to the 28 VDC supply, checking that the polarity is
correct.
NOTE: If an ammeter is not included on the 28 VDC supply, connect an ammeter in
series with the +28 VDC lead (15 amp capability).
(4) Adjust the power supply to 28.5±0.5 VDC.
(5) Engage CB-1 on the XL246-A. Readjust the power supply to 28.5±0.5 VDC.
(6) Record the input current.
NOTE: A low battery will cause up to 11-12 amps to flow for a few seconds, then settle
at (10) amps or below, and slowly decrease to less than 500 mA.
(7) Allow the XL246-A to charge for four hours or longer. The input current for a fully charged
battery (when new) will normally fall to less than 300 mA.
NOTE: If the input current is greater than 1 ampere, after four hours, it indicates a
potentially sulphided battery.
(8) After charging the XL246-A, pull CB-1 and allow it to sit for 8-24 hours.

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(9)After the 8-24 hours in step (8) above, engage CB-1 and perform a capacity check using
the BATT LEVEL TEST switch or (for more accuracy) the procedure in Paragraph D.
Shop Level Battery Capacity Discharge Test Procedures below.
C. Shop Level Capacity Test - Equipment Required
A 3.8 ohm, 200 watt power resistor or a 6 amp constant current load bank capable of
dissipating up to 150 watts.
NOTE: Securaplane uses a Kikasusi PL2302W load bank capable of constant current,
constant power, or constant resistance.
D. Shop Level Battery Capacity Discharge Test Procedures
NOTE: You may use the URDC 221TF101-1 for the discharge test.
(1) Remove 28 VDC input for total test.
(2) Disengage CB-1 on the XL246-A.
(3) Connect the load between XL246-A connector P1B-8 output and P1-6.
(4) Connect a digital voltmeter across the load.
(5) Have a stop watch available that reads elapsed time up to 1 hour 20 minutes.
(6) Engage CB-1 and start the stop watch.
(7) Allow the XL246-A to discharge until it cuts the battery output OFF (battery output falls
sharply to less than 10 VDC). The elapsed time should be at least 60 minutes for a newly
installed battery, or 45 minutes for an in-service battery.
(8) If the new XL246-A does not pass the new battery 60 minute test, it should be returned to
Securaplane for analysis.
(9) If an in-service XL246-A does not pass the 45 minute test, return the unit to Securaplane
for warranty repair.
CAUTION: IMMEDIATELY FOLLOWING THE DISCHARGE TEST, RECHARGE THE
BATTERY AGAIN PER PARAGRAPH B. - EVEN IF IT DID NOT PASS THE
REQUIRED TIME TEST.

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INSPECTION/CHECK
1. Introduction
This section contains Securaplane’s recommended inspection and check procedures for the
XL246-A Battery Charger. Disassembly is not required to check this unit.
CAUTION: THIS UNIT CONTAINS AN ASSEMBLY THAT CAN BE DAMAGED BY INCORRECT
HANDLING. DO NOT DROP OR HIT UNIT DURING THESE PROCEDURES.
2. Equipment and Materials
Not applicable.
3. General Check Procedures
A. External Visual Checks
NOTE: These checks are limited to external visual checks only. Refer to Testing and Fault
Isolation section to verify the operational status of the unit.
(1) Examine the unit for nicks, cracks, scores, dents, scratches, corrosion, or broken welds
which may affect the unit’s operation.
(2) Examine the exterior painted surfaces for cracked, chipped, blistered, or deteriorated
paint film.
(3) Examine identification information and instruction placards, and ensure they are legible
and securely attached.
(4) Check connectors for damaged or loose pins; ensure they are mounted correctly.
(5) Verify LED display mounting integrity and acceptability of appearance.
(6) Check chassis assembly for loose or missing fasteners.
(7) Verify the electrical bonding integrity of the mounting plate.
4. Aircraft Level Checkout, Existing Installation
The functional checkout of the XL246-A is the same as the AMPS-2000. The same XL246-A
switches perform the same functions as the AMP-2000 switches.
(1) Activate aircraft electrical power system.
(2) Open the aircraft input circuit breaker to the XL246-A under test.
(3) If the CHARGER INHIBIT function is not incorporated in the aircraft, verify connector P1-2
is permanently grounded. Go to step (7) below.
(4) If the CHARGER INHIBIT function is incorporated in the aircraft, activate the avionics
system or control system that controls the charger inhibit function.
(5) Verify the inhibit control (28 VDC) on connector P1-2.
(6) Verify the charge inhibit function is not engaged during checkout of the XL246-A.
(7) Install XL246-A in its mounting tray. Secure the J-bolts.
(8) Close XL246-A CB-1.
(9) Close the aircraft input circuit breaker.
(10) Open aircraft input circuit breakers to the rest of the emergency battery packs controlled
through the same switch cluster. The cockpit Not armed/OFF indicator light should be
illuminated.

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(11) Engage the cockpit ON switch. The logic controlled outputs should illuminate and apply
power to connected aircraft devices. The ON indicator light illuminates.
(12) Engage the OFF switch. Aircraft devices powered from the XL246-A turn off.
(13) Engage the ARM switch.
(14) Open the aircraft input circuit breaker to remove aircraft 28 VDC from the XL246-A. The
XL246-A logic controlled outputs turn on and apply power to connected aircraft devices.
The ON indicator light illuminates.
(15) Engage the cockpit OFF switch. There shall be no change in XL246-A operation.
(16) Close the aircraft input circuit breaker, restoring 28 VDC to the XL246-A.
(17) Engage either the cockpit OFF or ARM switch to de-power connected aircraft devices. If
the OFF switch is engaged, the Not ARMED/OFF indicator will illuminate. If the ARM
switch is engaged, neither ARM or OFF indicators will illuminate.
(18) Close XL246-A CB.
(19) Leave DC power on the A/C for 1 hour to recharge the unit following installation checkout.

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CLEANING/PAINTING
1. Introduction
This section contains general procedures recommended by Securaplane to clean the XL246-A
Emergency Battery system. There is no disassembly required to clean the unit.
WARNING: BEFORE THE MATERIALS CALLED OUT IN THIS PUBLICATION ARE USED,
UNDERSTAND THE HANDLING, STORAGE AND DISPOSAL PRECAUTIONS
RECOMMENDED BY THE MANUFACTURER OR SUPPLIER. FAILURE TO HEED
THE MANUFACTURERS’ OR SUPPLIERS’ RECOMMENDATIONS CAN RESULT
IN PERSONAL INJURY OR DISEASE.
CAUTION: THESE PROCEDURES MUST BE DONE AT A STATIC-FREE WORK STATION IN
ORDER TO PREVENT DAMAGE TO ELECTROSTATIC SENSITIVE
COMPONENTS.
CAUTION: THIS UNIT CONTAINS ASSEMBLIES THAT ARE SUSCEPTIBLE TO DAMAGE
FROM INCORRECT HANDLING. DO NOT DROP OR HIT THE UNIT DURING
THESE PROCEDURES.
2. Cleaning Equipment and Materials
Table 7001 presents the required equipment and materials. Equivalent equipment/material can be
used.
Table 7001: Cleaning Equipment and Materials
Equipment/Materials Manufacturer
Brush (soft bristle fibers) Commercially available
Cloth Commercially available
Isopropyl alcohol Commercially available
(Federal Specification TT-I-735)
Methyl-ethyl-ketone (MEK) Commercially available
(Federal Specification TT-M-261)
Solvent (Micro Care Proclean) Micro Care Chemical Corp.,
(with solvent miser grip, ESD safe 34 Ronzo Rd.,
brush, in agreement with MIL 2000) Bristol, CT 06010
3. General Cleaning Practices
A. Practices
(1) Each part must be cleaned with the procedures referred to in this section or the
equivalent procedures used by an approved overhaul facility. Solutions specified must be
made with the instructions in this manual or to the instructions supplied by the product
manufacturer.
(2) These procedures agree with good shop procedures as used by the Securaplane facility.
Clean parts are important to satisfactory operation.
(3) Use clean, dry, filtered, compressed air at a maximum of 20 psig (138 kPa) to dry parts.

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4. General Cleaning Procedures

WARNING: CLEAN THE PARTS IN AN AREA OPEN TO THE AIR, WITH GOOD LIGHT, AND
SUFFICIENT SAFETY AND FIRE PREVENTION EQUIPMENT.
WARNING: USE APPROPRIATE PERSONAL PROTECTION. THIS CHEMICAL/SOLUTION
CAN CAUSE SKIN, EYE, AND LUNG DAMAGE. DANGER AND HANDLING
PRECAUTIONS FOR EACH CHEMICAL IS DIFFERENT.
A. External Cleaning
NOTE: Cleaning shall be limited to external cleaning only.
(1) Clean the outside surfaces of the unit with a clean lint-free cloth moistened with
an approved solvent (Micro Care Proclean, isopropyl alcohol or MEK).
(2) The connectors shall be free of dirt or corrosion. Scrape off the corrosion and clean the
connectors with a soft bristle brush lightly moistened with the approved solvent (Micro
Care Proclean, isopropyl alcohol or MEK). Remove solvent residue with a clean, dry lint-
free cloth.
NOTE: Use an approved cap, plug and barrier material for part storage after cleaning.
Do not use tape, loose plastic, or rags to protect clean parts.
(3) Install a protective cap on the connector to guard against contamination and thread
damage.

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REPAIR

Not Applicable

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SPECIAL TOOLS, FIXTURES, AND EQUIPMENT

1. Shop Test Equipment
The Bench Charge Harness (Securaplane part number, TE-0011-01) is identified in Figure 9001.
The wires connected to pin 5 and pin 6 should be 16 gauge or larger, less than 2 meters (6.5 feet)
in length, and terminated in banana plugs or termination compatible with shop equipment. The
terminals connected to pin 7 (optional) and pin 8 may be insulated terminal posts or banana jacks.
They may be soldered directly to the contact; otherwise, a convenient length of insulated 16-gauge
wire is required. If the terminals are to be connected directly to the contact, it may be necessary to
relocate the battery return next to the NAV (IRS) output terminal in pin 8. Pins 6 and 7 are
connected together inside the XL246-A.

Figure 9001: Bench Charge Harness

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ILLUSTRATED PARTS CATALOG (IPL)

Not Applicable

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