Leonardo S.p.A.
Via Giovanni Agusta, 520
21017 Cascina Costa di Samarate (VA) Italy
Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595
SERVICE BULLETIN
N° 109-160
RECOMMENDED DATE:
REV. :
August 2, 2024
/ - December 22, 2023
TITLE
ATA 64 – TAIL ROTOR DUPLEX BEARING SUPPORT IMPROVEMENT
REVISION LOG
First Issue
An appropriate entry should be made in the aircraft log book upon accomplishment.
If ownership of aircraft has changed, please, forward to new owner.
Page 1 of 63
1. PLANNING INFORMATION
A. EFFECTIVITY
All A109C helicopters.
B. COMPLIANCE
Within and not later than 48 (fourty-eight) months after the issue of this Service Bulletin.
C. CONCURRENT REQUIREMENTS
N.A.
D. REASON
This Service Bulletin is issued in order to provide the necessary instruction to improve
the tail rotor installation with the new design of the retaining system of the duplex
bearing.
LH issued this SB for the following reason:
Helicopter Reliability/Maintainability
Product Improvement ✔
Obsolescence
Customization
Product/Capability Enhancement
E. DESCRIPTION
Leonardo Helicopter has developed this Service Bulletin in order to perform the
replacement of the support bearing sleeve assy.
F. APPROVAL
The technical content of this Service Bulletin is approved under the authority of DOA
nr. EASA.21.J.005. For helicopters registered under other Aviation Authorities, before
applying the Service Bulletin, applicable Aviation Authority approval must be checked
within Leonardo Helicopters customer portal.
EASA states mandatory compliance with inspections, modifications or technical
directives and related time of compliance by means of relevant Airworthiness
Directives.
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If an aircraft listed in the effectivity embodies a modification or repair not LH certified
and affecting the content of this Service Bulletin, it is responsibility of the
Owner/Operator to obtain a formal approval by Aviation Authority having jurisdiction on
the aircraft, for any adaptation necessary before incorporation of the present Service
Bulletin.
G. MANPOWER
To comply with this Service Bulletin, approximately 10 (ten) MMH are deemed
necessary.
MMH are based on hands-on time and can change with helicopter configuration,
personnel and facilities available. MMH are not comprehensive of the overall hours
necessary to get access to work areas and to remove all the equipment that interferes
with the application of the prescribed instructions.
H. WEIGHT AND BALANCE
Negligible.
I. REFERENCES
I.1 PUBLICATIONS
Following Data Modules refer to MM:
DATA MODULE DESCRIPTION PART
DM01 00-20-1 Helicopter safety -
DM02 64-30-3 Pitch change mechanism- -
Removal/installation
I.2 ACRONYMS & ABBREVIATIONS
AMDI Aircraft Material Data Information
AR As Required
DM Data Module
DOA Design Organization Approval
EASA European Union Aviation Safety Agency
IPC Illustrated Parts Catalog
LH Left Hand
MM Maintenance Manual
MMH Maintenance Man Hours
N.A. Not Applicable
P/N Part Number
PTUM Pictorial Tools Usage Manual
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RH Right Hand
SB Service Bulletin
S/N Serial Number
I.3 ANNEX
Annex A – Removal/installation (Sleeve assy P/N 109G6430A03)
Annex B – Torque wrenches – Operation
Annex C – Threaded fasteners – Tighten procedure
J. PUBLICATIONS AFFECTED
A109C Maintenance Manual
A109C Illustrated Parts Catalog
CSPP-A-CSPP-00-X Common Standard Practices Publication
K. SOFTWARE ACCOMPLISHMENT SUMMARY
N.A.
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2. MATERIAL INFORMATION
A. REQUIRED MATERIALS
A.1 PARTS
# P/N ALTERNATIVE P/N DESCRIPTION Q.TY LVL NOTE LOG P/N
1 109G6430A03-101 Support bearing sleeve assy 1 . (1)
2 109G6430A03-105 Support bearing sleeve assy 1 . (2)
3 109G6430A04-101 Flange 1 . 709-104L1
4 109G6430A05-101 Peeling shim 1 . 709-104L1
5 AW021TB03H004 Bolt 6 . 709-104L1
6 MS21299C3K Countersunk washer 6 . 709-104L1
7 NAS1149C0332R Washer 6 . 709-104L1
Refer also to IPC for the spares materials required to comply with the MM DMs
referenced in the accomplishment instructions.
Refer also to Annex A for the spares materials required to comply with this Service
Bulletin.
A.2 CONSUMABLES
The following consumable materials, or equivalent, are necessary to accomplish this
Service Bulletin:
# SPEC./LH CODE NUMBER DESCRIPTION Q.TY NOTE PART
8 MS20995C32 Lockwire AR (3) -
Refer also to AMDI for the consumable materials required to comply with the MM DMs
referenced in the accomplishment instructions.
Refer also to Annex A for the consumable materials required to comply with this Service
Bulletin.
A.3 LOGISTIC MATRIX
In order to apply this Service Bulletin, the following Logistic P/N can be ordered in
accordance with the applicable notes:
LOGISTIC P/N Q.TY (PER HELO) NOTE PART
709-104L1 1 - -
109G6430A03-101 1 (1) -
109G6430A03-105 1 (2) -
NOTES
(1) Applicable to A109C helicopters that install duplex bearing P/N 109-0133-05-103
or P/N 109-0133-05-107.
(2) Applicable to A109C helicopters that install duplex bearing P/N 109-0133-05-101
or P/N 109-0133-05-105.
(3) Item to be procured as local supply.
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B. SPECIAL TOOLS
Refer to PTUM for the special tools required to comply with the AMP DM referenced in
the accomplishment instructions.
Refer also to Annex A for the special tools required to comply with this Service Bulletin.
C. INDUSTRY SUPPORT INFORMATION
Owners/Operators who comply with the instructions of this Service Bulletin no later than
the applicable date in the “Compliance” section will be eligible to receive REQUIRED
MATERIALS on free of charge basis, except for Consumable Materials and Special
Tools. NOTE: Customers who fail to comply with the instructions in this Service Bulletin
before the compliance date are not eligible for the aforementioned special policy. Please
Issue relevant MMIR form to your Warranty Administration Dpt.
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3. ACCOMPLISHMENT INSTRUCTIONS
GENERAL NOTES
a) Place an identification tag on all components that
are re-usable, including the attaching hardware that
has been removed to gain access to the modification
area and adequately protect them until their later re-
use.
b) Exposed thread surface and nut must be protected
using a layer of tectyl according to MIL-C-16173
grade I.
c) All lengths are in mm.
1. In accordance with MM DM 00-20-1, prepare the helicopter on ground for a safe
maintenance. Disconnect the battery, all electrical power sources and/or the external
power supply.
2. In accordance with the applicable steps of MM DM 64-30-3, disassembly the housing and
slider group. Discard the tail rotor support bearing sleeve assy P/N 109-0130-94-XXX (any
dash installed) and the locking nut P/N 109-0130-97-XXX (any dash installed).
3. In accordance with the applicable steps of Annex A, Annex B and Annex C, re-assembly
the housing and slider group with the new support bearing sleeve assy
P/N 109G6430A03-101 or P/N 109G6430A03-105, the new flange P/N 109G6430A04-
101 and the new peeling shim P/N 109G6430A05-101.
4. Return the helicopter to flight configuration and record for compliance with this Service
Bulletin on the helicopter logbook.
5. Gain access to My Communications section on Leonardo Customer Portal and compile
the “Service - Technical Bulletin Application”.
As an alternative, send the attached compliance form to the following mail box:
engineering.support.lhd@leonardo.com
and (for North, Central and South America) also to:
AWPC.Engineering.Support@leonardocompany.us
Non cancellare mai questo segnalibro Non cancellare mai interruzione sezione
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ANNEX A
REMOVAL/INSTALLATION (SLEEVE ASSY P/N 109G6430A03)
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ANNEX B
TORQUE WRENCHES – OPERATION
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ANNEX C
THREADED FASTENERS – TIGHTEN PROCEDURE
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Please send to the following address:
SERVICE BULLETIN COMPLIANCE FORM Date:
LEONARDO S.p.A.
CUSTOMER SUPPORT & SERVICES - ITALY Number:
PRODUCT SUPPORT ENGINEERING & LICENSES DEPT.
Via Giovanni Agusta, 520
21017 Cascina Costa di Samarate (VA) - ITALY Revision:
Tel.: +39 0331 225036 Fax: +39 0331 225988
Customer Name and Address: Telephone:
Fax:
B.T. Compliance Date:
Helicopter Model S/N Total Number Total Hours T.S.O.
Remarks:
Information:
We request your cooperation in filling this form, in order to keep out statistical data relevant to aircraft configuration up-to-date. The form should be filled in all
its parts and sent to the above address or you can communicate the application also via Technical Bulletin Application Communication Section placed in
Leonardo AW Customer Portal - MyCommunications Area. We thank you beforehand for the information given.
