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Honeywell International Inc.

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Telephone: 800-601-3099 (Toll Free U.S.A./Canada)
Telephone: 602-365-3099 (International Direct)

Website: https://aerospace.honeywell.com

SERVICE BULLETIN
AIRBORNE AUXILIARY POWER UNIT (APU) - OIL - GENERAL - Approved Oils

Legal Notice
Export Control

These items are controlled by the U.S. government and authorized for export only to the country of ultimate
destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred,
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HONEYWELL - CONFIDENTIAL
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WRITTEN PERMISSION OF HONEYWELL INTERNATIONAL INC.

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HONEYWELL MATERIALS LICENSE AGREEMENT

This document and the information contained herein (“the Materials”) are the proprietary data of Honeywell.
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or any person or entity whose actions or functions are intended to support “military end uses.” “Military End Uses”
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PERFORMANCE, DEALING, USAGE, OR TRADE, WHICH ARE HEREBY EXPRESSLY DISCLAIMED, OR (ii)
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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 OBEY THE MANUFACTURERS' OR SUPPLIERS' RECOMMENDATIONS CAN
RESULT IN PERSONAL INJURY OR DISEASE.
This publication describes physical and chemical processes which can make it necessary to use chemicals,
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Data Sheets (OSHA Hazard Communication Standard (HCS) 29 CFR 1910.1200(g) or equivalent) from the
manufacturers or suppliers of the materials to be used. The user must know the manufacturer/supplier data and
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WARNING: HONEYWELL ASSUMES NO RESPONSIBILITY FOR ANY HONEYWELL EQUIPMENT WHICH
IS NOT MAINTAINED AND/OR REPAIRED IN ACCORDANCE WITH HONEYWELL'S PUBLISHED
INSTRUCTIONS AND/OR HONEYWELL'S FAA/ODA REPAIR AUTHORIZATION. NEITHER DOES HONEYWELL
ASSUME RESPONSIBILITY FOR SPECIAL TOOLS AND TEST EQUIPMENT FABRICATED BY COMPANIES
OTHER THAN HONEYWELL.
WARNING: 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 THE PRODUCT COMPONENTS OR GIVE UNSATISFACTORY RESULTS.

Copyright - Notice
Copyright 2007, 2022 Honeywell International Inc. All rights reserved.
Honeywell is a registered trademark of Honeywell International Inc.
All other marks are owned by their respective companies.

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Transmittal Information
ATA Number 49-7933 (Publication Number 49–7933)
Summary
This revision is a FULL replacement. This revision includes the changes that follow:
• Figure 1. Sheet 5. Added column HGT400 and HGT750 for all oils.
• Changed the content and format to agree with Honeywell processes in effect at the time of the release of this
revision.
The information that is identified with revision bars is listed in the Revision History section. Revision bars are not
used before Paragraph 1.A. The editorial changes and information that was moved, removed, or reformatted
are not identified with revision bars.
Refer to Paragraph 4.A. for a list of the acronyms and abbreviations used in this service bulletin.
Revision History
This service bulletin has had ten revision(s) as shown in Table 1.
Table 1. Revision History

Revision Number Revision Date

0 24 Apr 2007
1 4 June 2007
2 9 Apr 2010
3 31 Oct 2011
4 12 Aug 2014
5 23 Oct 2014
6 26 Jan 2016
7 9 Feb 2017
8 27 Jul 2017
9 3 April 2020
10 18 Jan 2022

Highlights

This section issues Revision 10 to Service Bulletin, ATA Number 49-7933- (Publication Number 49-7933), and
contains these changes:
The list of highlights tells the users about the changes that the revision makes. The list has three columns. The
"Page" column shows the block of data that the revision changes and the page on which the block begins. The
block can be a section, subsection, graphic, table, etc. Revision marks give the location of the change in the
block. The "Description" column tells the user about the change or changes in each block. A paragraph, table,
or figure reference often comes before the description. The "Effectivity" column tells the user about the part

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number(s) to which the block of information applies. The default value for this column is "All." "All" means that
the block applies to all parts.

Page Description Effectivity

16 Figure 1 Sheet 5. Added column HGT400 and HGT750 for all oils. All

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1. Planning Information
A. Effectivity
(1) This service bulletin is applicable to all commercial APU models identified in the
Paragraph 4.B.

B. Concurrent Requirements
(1) Not applicable.

C. Reason
(1) This service bulletin gives the lubricating oils approved for use in the Honeywell APUs
identified in Paragraph 4.B.

D. Description
(1) This service bulletin summarizes the approval, disapproval, or restricted status of specific
brand - named synthetic lubricating oils for use in Honeywell commercial APUs. The
identified lubricating oils (hereinafter referred to as “oils”) are certified or substantiated
in accordance with applicable U.S. FAA requirements.
(2) In the event of conflict with the contents herein and any applicable U.S. FAA
requirements, the latter will take precedence.

E. Compliance
(1) It is expected that this service bulletin be complied with on all APU models identified
herein. Compliance with this service bulletin is a condition of APU warranty and any
maintenance agreements with Honeywell repair facilities or designated/licensed repair
facilities, excluding Honeywell specific field evaluation service bulletins.

F. Approval
(1) The FAA has approved the technical content of this service bulletin under the authority
of the TSO certificate holder.

G. Manpower
(1) Not applicable.

H. Weight and Balance

(1) None.

I. Electrical Load Data

(1) Not changed.

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J. Software Accomplishment Summary

(1) Not applicable.

K. References
(1) The documents identified below are a part of this service bulletin to the extent referenced.
The revision identified in this section is the one in effect as of publication of this document,
and is omitted in subsequent references herein. In the event of conflict with the contents
of this publication, the latest revision of the identified documents will take precedence.
Table 2. Reference(s)

Honeywell Engines, Systems & Services Reports

21-2560C Oil Approval Test Procedure For Honeywell Civil Aircraft Auxiliary Power Units
03-02-17 and Gearboxes

British Ministry Of Defense (UK MOD) Defense Standards (Def Stan)

91-94/2 (DERD 2468), Issue 2 Lubricating Oil, Gas Turbine Engine, Synthetic Grade 3 cSt, Joint Service
07 Dec 01 Designation: OX-7
91-98/2 (DERD 2487), Issue 2 Lubricating Oil, Gas Turbine Engine, Synthetic Grade 7.5 cSt, NATO Code:
07 Dec 01 0-149; Joint Service Designation: OX-38
91-100/3 (DERD 2497), Issue 3 Lubricating Oil, Gas Turbine Engine, Synthetic Grade 5 cSt, NATO Code:
9 Jan 06 0-160, Joint Service Designation: OX-26

U.S. FAA
FAA Advisory Circular (AC) Qualification of Fuels, Lubricants, and Additives for Aircraft Engines
Number 20-24D,
06/30/14
FAA Memorandum FAA Certification Policy for Turbine Engine Lubricating Oils Qualified to AS5780
29 Mar 07

U.S. Military Specifications

MIL-PRF-7808L Performance Specification, Lubricating Oil, Aircraft Turbine Engine, Synthetic
02 May 97 Base
MIL-PRF-23699G Performance Specification, Lubricating Oil, Aircraft Turbine Engine, Synthetic
13 March 14 Base, NATO Code Number 0-156
DOD-PRF-85734A, Amendment Military Specification, Lubricating Oil, Helicopter Transmission System,
2 Synthetic Base
29 Jun 04
Other

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Table 2. Reference(s) (Cont)

SAE AS5780C Aerospace Standard Specification for Aero and Aero-derived Gas Turbine
Aug 17 Engine Lubricants

L. Other Publications Affected

(1) The Honeywell component maintenance manuals, engine manuals, and maintenance
manuals will refer to this service bulletin for approved oils.

M. Interchangeability or Intermixability of Parts

(1) Not applicable.

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2. Material Information
A. General
(1) Severity of Oil Service/Service Requirements
(a) Commercial model APUs may be categorized by severity of service. Satisfactory
operation of an oil in a given product would allow approval of that oil for use in
all applications of lesser severity. Severity is established by considering factors
such as duty cycle, environment, oil temperature, lubricated-element mechanical
design, and field and test experience.
(b) All brand-name oils conforming to military specifications MIL-PRF-7808 or
MIL-PRF-23699 are not necessarily approved for commercial use, due to
differences in foaming, coking characteristics, and other criteria.
(2) Approval Status Categories
(a) Specific brand-name oils that have been tested in compliance with the intent of
FAA AC 20-24, and any additional applicable requirements and are Approved
individually by Honeywell for use in a particular APU (or qualified by similarity
to other models tested) are identified as Category “A” in the applicable tables.
Tested oils that are Disapproved for use in specific models are identified as
Category “D” in the tables.
(b) Some oils identified as Category “R” are Not Approved (either Approved or
Disapproved) due to specific Model Specification omission.
(3) Approval Status Change
(a) Honeywell reserves the right to withdraw approval for the reasons that follow:
– Notification from the oil supplier
– Notification from the aircraft manufacturer
– Notification from the affected equipment operators when service experience
warrants further testing and/or disapproval.

(b) For specific aircraft type or APU exceptions to this service bulletin, refer to the
applicable AMM or CMM.
(4) Oil Additives
(a) Modern synthetic turbine oils are a complex formulation of base stock and
additives to meet demanding performance requirements. Honeywell does not
authorize the use of additional additives in the oil in the field. Field additives
can seriously compromise the performance of the existing additives and can
result in an overall degradation of lubrication performance. Therefore oil additives
are not recommended or approved.
(5) Changing Oil Types or Brands
(a) The two Honeywell approved methods to change oil types or brands for APUs
are “Topping off” and “Drain, Flush, Drain and Refill”.
– Topping off (replenish the oil in the reservoir through routine oil service
without any drain or flush) is limited to oil brand changes within a given oil
specification approved for the Honeywell APUs. Gas turbine engine lubricant

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specification MIL-PRF-23699, MIL-PRF-7808, and SAE AS5780 require oil

brands within a given specification to be compatible. To change from one
oil class to another within a specification (for example, standard to HTS in
MIL-PRF-23699 or SPC to HPC in SAE AS5780) by topping off is acceptable.
– Drain, flush, drain and refill must be used whenever different nominal oil
viscosities are involved to minimize oil compatibility problems and to expedite
the benefits of the new oil viscosity rating. This requires an oil drain and refill
with the new brand of oil. Run the APU for 10 minutes minimum. Drain the
oil and refill with fresh new oil and filter.

(6) Requirements for Oil Approval

(a) Operators and oil suppliers must request approval from Honeywell Product
Support Engineering before operating APUs with oil that is not identified in the
Appendix. There are typically three options for substantiating the approval:
– Field evaluation
– Similarity
– In-house testing
– Combinations of these.

(b) The decision to substantiate an oil not identified in the Appendix and the selection
of the appropriate method of substantiation is the responsibility of Honeywell.
(c) Field evaluations require operator involvement, documentation, and agreement
to the substantiation requirements. Field evaluations are only conducted after
successful completion of laboratory analyses confirming the oil conforms to
specifications identified in the References. In-service APUs to be used for the
field evaluation requires certain parts to be inspected both before and after
completion of the field evaluation (if new parts are used, only post-evaluation
inspection is required). The parts that require inspection may vary by the APU
and the oil that is tested. Oil sampling, in-service routine maintenance
requirements, recording/reporting, and others details of the field evaluation will
be developed with each approval activity.
(d) Oils tentatively approved by Honeywell for field evaluation are identified as
Category “T”, in the applicable tables for use in field evaluation units, only after
successfully completing a property and compatibility analysis and evaluation,
and an engine test (hot oil testing for oil durability). Oil approval, as specified
herein, is conditional upon successful completion of the field evaluation testing
and/or satisfactory service experience.
(7) Coking Resistance
(a) MIL-PRF-23699 HTS and SAE AS 5780 HPC oils have demonstrated excellent
coking resistance, even in the more demanding APU applications.
(8) Ambient Temperature Range
(a) Refer to Appendix Table 5.

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B. Industry Support Information

(1) Not applicable.

C. Material Necessary for Each Engine

(1) Not applicable.

D. Material Necessary for Each Spare

(1) Not applicable.

E. Reidentified Parts
(1) Not applicable.

F. Tooling - Price and Availability

(1) Not applicable.

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3. Accomplishment Instructions
A. Not Applicable

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4. Appendix
A. Appendix A,
Refer to Table 3 for a list of the acronyms and abbreviations used in this service bulletin.
Table 3. Acronyms and Abbreviations

Term Full Term

AMM aircraft maintenance manual
ATA Air Transport Association
APU auxiliary power unit
BP British Petroleum
CAGE commercial and government entity
CMM component maintenance manual
cSt centistoke
ECC Eastman Chemical Company
ECCN Export Control Classification Number
FAA Federal Aviation Administration
HTS high thermal stability
HPC high performance capability
OSHA Occupational Safety and Health Administration
PMA Parts Manufacturer Approval
SFAR Special Federal Aviation Regulation
TSO Technical Standard Order
°C degree Celsius
°F degree Fahrenheit

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B. Appendix B, Approved Oils

WARNING: BEFORE YOU USE A MATERIAL, REFER TO THE MANUFACTURERS’
MATERIAL SAFETY DATA SHEETS. SOME MATERIALS CAN BE
DANGEROUS.
CAUTION: DO NOT USE MATERIALS THAT ARE NOT EQUIVALENT TO
HONEYWELL-SPECIFIED MATERIALS. MATERIALS THAT ARE NOT
EQUIVALENT CAN CAUSE DAMAGE TO THE EQUIPMENT AND CAN MAKE
THE WARRANTY NOT APPLICABLE.
CAUTION: USE OF NON-APPROVED OILS, OR WHEN BRANDS OR TYPES OF OILS
ARE MIXED TOGETHER, CAN DAMAGE APU.
CAUTION: FOLLOW THE LUBRICANT MANUFACTURER’S RECOMMENDATIONS IN
REGARD TO THE PERMITTED SHELF LIFE. HOWEVER, HONEYWELL
RECOMMENDS THAT AFTER 3 YEARS FROM PRODUCT MANUFACTURE,
AND EACH 3 YEARS (OR LESS) THEREAFTER, THE OIL SHOULD BE TESTED
TO VERIFY THAT ITS QUALITIES COMPLY WITH THE APPLICABLE
MANUFACTURER'S SPECIFICATIONS, ESPECIALLY IN REGARD TO WATER
CONTENT.
(1) The figures that follow summarize the approval status of various oil brands for each
applicable Honeywell APU model. Obsolete or superseded oil formulations have been
deleted. The figures apply to most commercial applications only.
(2) How to use the data in Figure 1 and Figure 2:
(a) To Find Approved Oils - for a specific Honeywell model APU locate the product
model(s) designation (shown numerically across the top). Read down the vertical
column for indicated approvals and then across the table to the left-hand column
for brand names of approved oils.
(b) To Find the Product Model(s) - on which a specific oil is approved, locate the
oil by the brand name (identified in the left-hand vertical column). Read across
the table for the indicated approval. The product model is shown at the top of
the chart.
(c) Brand-Name Oils - The oils identified in the tables that follow are approved by
Honeywell for use with the applicable units, based upon military specifications
and information furnished by the respective petroleum product manufacturers.
Honeywell does not undertake any responsibility for or surveillance of the quality
or characteristics of any particular brand-name of oil. Information concerning
the specific characteristics of any particular brand of oil should be obtained from
the applicable manufacturer.
(3) Refer to Table 4 for the codes and notes that are used in Figure 1 and Figure 2:
Table 4. Explanation of Codes and Notes Used in Approved Lubricants Charts

Code
A Approved
D Disapproved

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Table 4. Explanation of Codes and Notes Used in Approved Lubricants Charts (Cont)

P Preservative use only (on applicable models). Refer to Note (3)

R Restricted -- Not Approved or Disapproved, due to model specification omission
T Field Evaluation/Test Only
Note Oil(s) Note(s)
1 (All) Applies to commercial APU models only.
2 Brayco 880 Now Castrol 399.
3 Castrol Aerojet 5 Restricted use (P) -- may be used ONLY as a preservative oil by
cold-motoring. The unit must be de-preserved in accordance with
the applicable unit maintenance manual and serviced with an
approved (A) oil before operation. Exception: 331-350 APUs are
required by CMM to use this oil for the entire test cell run with no
preservation required.
4 Castrol 3C These identified oils, which are no longer produced, are approved
Castrol 205 for use as shown in Figure 2. Usage may continue until the existing
Castrol 325 stocks are depleted.
Castrol 5050 CAUTION: FOLLOW THE LUBRICANT MANUFACTURERS
Castrol 98 RECOMMENDATIONS IN REGARDS TO PRODUCT
Chevron Jet Oil 5 SHELF LIFE.
Exxon ETO85
Mobil 291
Monsanto SkyLube 450
5 BPTO 2197 Now ETO 2197, ETO 2380, ETO 2389, ETO 25, and ETO 274,
BPTO 2380 which are identical to the corresponding BPTO products after ECC
BPTO 2389 purchased BP turbine engine oil products.
BPTO 25
BPTO 274

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Figure 1. (Sheet 1 of 5) Commercial Auxiliary Power Unit Approved Oils

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Figure 1. (Sheet 2 of 5) Commercial Auxiliary Power Unit Approved Oils

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Figure 1. (Sheet 3 of 5) Commercial Auxiliary Power Unit Approved Oils

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Figure 1. (Sheet 4 of 5) Commercial Auxiliary Power Unit Approved Oils

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Figure 1. (Sheet 5 of 5) Commercial Auxiliary Power Unit Approved Oils

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Table 5. Ambient Temperature Operating Range

Viscosity Ambient Temperature

Specification (cSt) Minimum/Maximum
Def Stan 91-94 3.0 -54°C (-65°F) TO +54°C (130°F)
MIL-PRF-7808L 3.0 -54°C (-65°F) TO +54°C (130°F)
Def Stan 91-100 5.0 -40°C (-40°F) TO +54°C (130°F)
MIL-PRF-23699F 5.0 -40°C (-40°F) TO +54°C (130°F)
SAE AS5780 5.0 -40°C (-40°F) TO +54°C (130°F)
Def Stan 91-98 7.5 -40°C (-40°F) TO +54°C (130°F)

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Figure 2. (Sheet 1 of 1) Auxiliary Power Unit Approved Oils No Longer Produced

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