# Honeywell Service Bulletin TFE731-72-3789

## Copies (2)

Copies the FAA filed in AD dockets on regulations.gov, newest revision first. A newer revision may exist.

- No revision named ("TFE731-72-3789"), 18 pages: PDF https://openairdocs.org/files/sha256/8a/f1/8af12c02573196d5cbe370233b1c20752954503f5bd161a07fa839229475967e; text https://openairdocs.org/service-documents/honeywell/tfe731-72-3789/file/8af12c025731.md. Rights: © Honeywell International Inc. Filed by the FAA in regulations.gov docket FAA-2015-2208; AD 2016-07-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- No revision named ("TFE731-72-3789 R0"), 18 pages: PDF https://openairdocs.org/files/sha256/c3/ce/c3ceb660e93b55c143e54697445cc231cfb53c7de0cc04684c63851a94b68d97; text https://openairdocs.org/service-documents/honeywell/tfe731-72-3789/file/c3ceb660e93b.md. Rights: © Honeywell International Inc. Filed by the FAA in regulations.gov docket FAA-2015-2208; AD 2016-07-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Honeywell](https://openairdocs.org/service-documents/honeywell.md)
- Type: Service bulletin (Service Bulletin)
- Number: TFE731-72-3789
- Page: https://openairdocs.org/service-documents/honeywell/tfe731-72-3789

## ADs that cite it (1) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2016-07-02](https://openairdocs.org/ad/2016-07-02.md), effective May 5, 2016: No revision named

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/honeywell/tfe731-72-3789/proposed.md).

## Text (18 pages)

No revision named, the newest copy. Rights: © Honeywell International Inc. Filed by the FAA in regulations.gov docket FAA-2015-2208; AD 2016-07-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

Honeywell International Inc.
111 S. 34th Street
Phoenix, Arizona 85034-2802
U.S.A.
CAGE: 99193
T elephone: 800-601-3099 (T oll Free U.S.A./Canada)
T elephone: 602-365-3099 (International Direct)
Website: www.myaerospace.com
SERVICE BULLETIN
ENGINE - TURBINE SECTION - Replace Specific Identified Interstage Turbine Transition (ITT) Duct on
TFE731-4, -5, and -5B Engine Family
Legal Notice
NOTICE: This is a CATEGORY 1, SAFETY service bulletin.
Export Control
This document contains technical data and is subject to U.S. export regulations. These commodities,
technology, or software were exported from the United States in accordance with the export administration
regulations. Diversion contrary to U.S. law is prohibited.
ECCN: 9E991.
Proprietary Information
Honeywell - Confidential
THIS DOCUMENT AND ALL INFORMATION AND EXPRESSION CONTAINED HEREIN ARE THE
PROPERTY OF HONEYWELL INTERNATIONAL INC., ARE PROVIDED IN CONFIDENCE, AND MAY BE
USED BY PERSONS REQUIRED BY FEDERAL AVIAT ION REGULATION PART 21.50 TO COMPLY WITH
ANY OF THE TERMS OF THESE INSTRUCTIONS. EXCEPT AS SET FORTH ABOVE, NO PERSON MAY ,
IN WHOLE OR IN PART , USE, DUPLICATE OR DISCLOSE THIS INFORMATION FOR ANY PURPOSE
WITHOUT THE PRIOR WRITTEN PERMISSION OF HONEYWELL INTERNATIONAL INC.
Honeywell Materials License Agreement
The documents and information contained herein ("the Materials") are the proprietary data of Honeywell
International Inc. These Materials are provided for the exclusive use of Honeywell Service Centers;
Honeywell-authorized repair facilities; operators of Honeywell aerospace products subject to an applicable
product support agreement, their wholly owned-subsidia ries or a formally designated third party service
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Agreement will govern in the event of a conflict between its terms and conditions and those of a purchase
order or acknowledgement.
1. License Grant - If you are a party to an applicable product support agreement, a Honeywell Service Center
agreement, or an authorized repair facility agreement, Honeywell hereby grants you a limited, non-exclusive
23 Mar 2015 TFE731-72-3789
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### Page 2

SERVICE BULLETIN
TFE731
license to use these Materials to operate, maintain, or repair H oneywell aerospace products only in accordance
with that agreement.
If you are a direct recipient of these Materials from Honeywell’s Aerospace T echnical Publication Distribution
and are not a party to an agreement related to the operation, maintenance or repair of Honeywell aerospace
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original Licensed Facility retains no copies of the Materials and you provide prior written notice to Honeywell.
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4. Assignment And Transfer - This License Agreement may be assigned to a formally designated service
designee or transferred to a subsequent owner or operator of an aircraft containing the subject Honeywell
aerospace products. However, the recipient of any s uch assignment or transfer must assume all of your
obligations under this License Agreement. No assignment or transfer shall relieve any party of any obligation
that such party then has hereunder.
5. Copies of Materials - Unless you have the express written permission of Honeywell, you may not make or
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representatives of the parties.
23 Mar 2015 TFE731-72-3789
Revision 0, 23 Mar 2015 Page 2
Publication Number D201407000043
© Honeywell International Inc. Do not copy without express permission of Honeywell.

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SERVICE BULLETIN
TFE731
Safety Adviso ry
WARNING: BEFORE THE MATERIALS CALLED OUT IN THIS PUBLICATION ARE USED, KNOW THE
HANDLING, STO RAGE 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,
solvents, paints, and other commercially available materials. The user of this publication must get the Material
Safety Data S heets (OSHA Form 174 or equivalent) from the manufacturers or suppliers of the materials to
be used. The user must know the manufacturer/supplie r data and obey the procedures, recommendations,
warnings and cautions set forth for the safe use, handling, storage, and disposal of the materials.
Warranty/Liability Advisory
WARNING: HONEYWELL ASSUMES NO RESPONSI BILITY FOR ANY HONEYWELL EQUIPMENT
WHICH IS NOT MAINTAINED AND/OR REPAIRED IN ACCORDANCE WITH HONEYWELL’S PUBLISHED
INSTRUCTIONS AND/OR HONEYWELL’S FAA/SFAR 36 REPAIR AUTHORIZATION. NEITHER DOES
HONEYWELL ASSUME RESPONSIBILITY FOR SPECI AL 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 2015 Honeywell International Inc. All rights reserved.
Honeywell is a registered trademark of Honeywell International Inc.
All other marks are owned by their respective companies.
THIS IS THE SB FOSI - DATE: 20121114
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SERVICE BULLETIN
TFE731
Transmittal I nformation
ATA Number TFE 731-72-3789 (Publication Number D201407000043)
Summary
This is the INI TIAL release.
Refer to Parag raph 1.N. for a list of the acronyms and abbreviations used in this service bulletin.
Revision Hist ory
This service b ulletin has had no revision(s) as shown in T able 1.
Table 1. Revis ion History
Revision Numb er Revision Date
0 23 Mar 2015
23 Mar 2015 TFE731-72-3789
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SERVICE BULLETIN
TFE731
1. P lanning Information
A. Effectivity
( 1 ) T h i si saC A T E G O R Y1 ,S A F E T Ys e r v i c eb u l l e t i n .
NOTE: CATEGORY 1 service bulletins address safety issues. Typically, they
require urgent action and are often, but not always, referred to by an FAA
Airworthiness Directive. Category 1 service bulletins may be issue da s
an ALERT service bulletin when immediate attention is required. ALERT
service bulletins are printed on light blue paper. The compliance schedule
stated in this service bulletin provides a reasonable reduction i nr i s k
while minimizing engine downtime.
(2) This service bulletin is applicable to the ITT duct shown in T able 2.
Table 2. Applicable Component(s)
PN
Affected Serial
Number 1
Engine
Serial
Number 2 PN
Affected Serial
Number 1
Engine
Serial
Number 2
3075292-4 950740421028 91136 3075292-4 1P22068 91504
3075292-4 950740421032 107628 3075292-4 1P22074 107409
3075292-4 960740402198 107759 3075292-4 1P8991 107420
3075292-4 00P07441 97398 3075292-4 1P9001 129225
3075292-4 00P09667 129287 3075292-4 1P9030 91667
3075292-4 00P12273 129137 3075292-4 2P10353 101305
3075292-4 00P20459 101319 3075292-4 2P12109 101236
3075292-4 00P23906 101269 3075292-4 2P1245 97258
3075292-4 01P05211 107398 3075292-4 2P1264 91403
3075292-4 01P07665 91435 3075292-4 2P4691 101158
3075292-4 01P08207 95127C 3075292-4 2P6155 102264
3075292-4 01P12559 91565 3075292-4 3P14039 107137
3075292-4 01P20088 101340 3075292-4 3P6805 101420
3075292-4 02P01960 107166 3075292-4 4P10306 91625
3075292-4 02P03983 97201 3075292-4 4P2185 102128
3075292-4 02P03984 107262 3075292-4 4P4315 95145
3075292-4 02P10194 101139 3075292-4 4P4317 107647
3075292-4 02P15527 107995 3075292-4 4P4324 101396
3075292-4 02P16154 76413C 3075292-4 4P5992 101304
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SERVICE BULLETIN
TFE731
Table 2. Applicable Component(s) (Cont)
PN
Affected Serial
Number 1
Engine
Serial
Number 2 PN
Affected Serial
Number 1
Engine
Serial
Number 2
3075292-4 02P17346 107133 3075292-4 5P11505 91512
3075292-4 02P21034 91535 3075292-4 5P11521 107443
3075292-4 03P20390 129135 3075292-4 5P3488 129197
3075292-4 04P03299 129168 3075292-4 5P7228 103254
3075292-4 04P20683 91502 3075292-4 96P03849 129353
3075292-4 04P20684 129140 3075292-4 96P03850 101402
3075292-4 04P23548 107520 3075292-4 96P04326 107966
3075292-4 05P03900 107666 3075292-4 96P17051 107770
3075292-4 05P07641 107499 3075292-4 97P00659 101303
3075292-4 05P09006 129118 3075292-4 97P06967 107268
3075292-4 05P17126 101107 3075292-4 97P08610 129360
3075292-4 06P02193 97262 3075292-4 97P10344 91568
3075292-4 06P04324 101149 3075292-4 97P10667 102283
3075292-4 06P19260 107991 3075292-4 97P21679 103101
3075292-4 06P21521 103180 3075292-4 98P03253 97129C
3075292-4 06P21523 107964 3075292-4 98P03665 102287
3075292-4 06P25314 91508 3075292-4 98P04855 129281
3075292-4 06P28426 91101 3075292-4 98P13626 101155C
3075292-4 06P28428 107325 3075292-4 98P24678 107557
3075292-4 06P30988 101226 3075292-4 98P28482 107589
3075292-4 06P30991 129279 3075292-4 98P28493 103124
3075292-4 07P07953 97290 3075292-4 99P03680 107440
3075292-4 07P07954 101148 3075292-4 99P08319 107462
3075292-4 07P07959 91356 3075292-4 99P13368 103230
3075292-4 0P2650 129141 3075292-4 99P13369 98121
3075292-4 0P2674 91273 3075292-4 99P15841 107173
3075292-4 1P13236 91341 3075292-4 99P16718 101401
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SERVICE BULLETIN
TFE731
Table 2. Applicable Component(s) (Cont)
PN
Affected Serial
Number 1
Engine
Serial
Number 2 PN
Affected Serial
Number 1
Engine
Serial
Number 2
3075292-4 1P21306 91153 3075292-4 99P20651 98155
3075292-4 1P21949 107425
NOTES:
1. If an ITT duct listed in T able 2 is identified with "P35864", the ITT duct has been reworked to replace the
suspect aft flange, and is no longer affected by this service bulletin.
2. Last known location of the affected ITT duct are included for reference.
(3) The component(s) shown in T able 2 are used on turbofan aircraft engines. This service
bulletin is applicable to the serial numbers shown in T able 3.
Table 3. Applicable Engine(s)
PN Model Number
Prior to Serial
Number Application
3075900-1 TFE731-4-1C
1
Falcon 50-4
3073640-2, -3 TFE731-4R-2S
1
Cessna Citation VII
3074860-1, -2 TFE731-5AR-1C
1
Falcon 900
3075360-1, -2 TFE731-5AR-2C
1
Falcon 20-5
3075330-3, -4, -5 TFE731-5BR-1C
1
Falcon 900B/900C
3075160-3, -4 TFE731-5BR-1H
1
Hawker 800XP/850XP/750
3075370-2, -3 TFE731-5BR-2C
1
Falcon 20-5
3074600-1, -2, -3, -4, -5 TFE731-5R-1H
1
Hawker 800
NOTE:
1. Refer to T able 2 to determine effectivity.
B. Concurrent Requirements
(1) The service bulletin(s) listed in T able 4 shall be accomplished prior to or concurrent
with this service bulletin. The accomplishment instructions outlined in each service
bulletin stand alone; therefore, compliance with this service bulletin does not indicate
compliance with any other service bulletin.
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SERVICE BULLETIN
TFE731
Table 4. Concurrent Service Bulletin(s)
Service Bulletin Number Service Bulletin Title
TFE731-72-3728 ENGINE - TURBINE SECTION - Install an Improved Turbine Interstage
Transition ( ITT) Duct
TFE731-72-3768 1 ENGINE - TURBINE SECTION - Install F irst Stage Low Pressure Turbine
(LPT1) Rotor Assembly with Riveted Blade Retention
TFE731-72-3769 2 ENGINE - TURBINE SECTION - Install F irst Stage Low Pressure Turbine
(LPT1) Roto r Assembly with Riveted Blade Retention
NOTES:
1. Except TFE731-5AR-2 C and TFE731-5BR-2C.
2. TFE731-5AR-2C and TF E731-5BR-2C only.
C. Reason
WARNING: FAILURE TO OBEY THIS SERVICE BULLETIN COULD CAUSE AN
UNCONTAINED FAILURE. IF LEFT UNCORRECTED, THIS COULD
RESULT IN AN IN-FLIGHT ENGINE SHUTDOWN AND COULD CAUSE
SERIOUS INJURY OR DEATH TO PERSONNEL, AND DAMAGE TO OR
LOSS OF THE AIRCRAFT .
(1) Problem:
(a) During rework of ITT duct, PN 3075292-1, -3 to PN 3075292-4, for compliance
with SB TFE731-72-3728, a forging was installed that d id not receive a
required heat treat process. The ITT ducts that received the incorrect forgings
(suspect ITT ducts) do not meet the requirements of SB TFE731-72-3728 or
FAA AD 2008-19-12.
(2) Background:
(a) A total of 110 modified ITT ducts, PN 3075292-4, received the incorrect
forging. Fifteen of the suspect ITT ducts were recovered and returned to
Honeywell prior to installation, but the remaining suspect ducts were installed
in engines when complying with SB TFE731-72-3728 and AD 2008-19-12.
The suspect ITT duct serial numbers and their last known location are
identified in T able 2. ITT ducts, PN 3075292-4 that are spare parts (shelf
stock) are also affected by this service bulletin.
(b) Suspect ITT duct are to be returned to Honeywell for rework. Suspect ITT
duct that have been reworked to correct the issue addressed by this service
bulletin will be identified by "P35864". ITT duct that are identified with a serial
number listed in T able 2, and are also identified with "P35864" are no longer
affected by this service bulletin, and may be returned to service, provided they
meet all other applicable inspection requirements.
(3) Action:
(a) Review the engine log book, T able 2, and Figure 1 to determine if one of the
suspect ITT ducts is installed. If a suspect ITT duct is installed, replace
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SERVICE BULLETIN
TFE731
the suspect ITT duct with a serviceable part at next access or at next MPI,
whichever occurs first.
Figure 1. (Sheet 1 of 1) Location of ITT Duct Part Number and Serial Numbers
D. Description
(1) This service bulletin provides instructions to review the engine log book and T able 2 of
this service bulletin to determine if a suspect ITT duct is installed. It also provides
instructions to replace the suspect ITT ducts with serviceable ITT ducts having serial
numbers that are not listed in T able 2, or if listed in T able 2, are also identified with
"P35864".
E. Compliance
(1) Compliance addresses a safety issue.
(2) Honeywell recommends that this service bulletin be accomplished at first access to
affected parts or next MPI, whichever occurs first.
(3) Review the part number and serial number of the installed ITT duct (refer to Figure 1)
and/or the engine log book/ITT Duct Component Maintenance/Modification Card, to
determine the part number and serial number of the installed ITT duct. If the installed
ITT duct part number and serial number is listed in T able 2, and if the ITT duct is not
identified with "P35864", remove the ITT duct from service and return to Honeywell
for rework, and replace with an ITT duct not affected by this service bulletin. If a
replacement ITT duct is identified with a part number and serial number is listed in
T able 2, and is also identified with "P35864", the ITT duct has been reworked and is no
longer affected by this service bulletin.
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SERVICE BULLETIN
TFE731
(4) Review the part number and serial number of all ITT duct as spare parts (shelf stock),
to determine the part number and serial number of the ITT duct. If the ITT duct part
number and serial number is listed in T able 2, and if the ITT duct is not identified with
"P35864", return the ITT duct to Honeywell for rework. If a replacement ITT duct
is identified with a part number and serial number is listed in T able 2, and is also
identified with "P35864", the ITT duct has been reworked and is no longer affected
by this service bulletin.
F . Approval
(1) The accomplishment instructions of this service bulletin comply with applicable Federal
Aviation Regulations and are FAA approved.
G. Manpower
(1) No additional man-hours are required to accomplish this change when performed at
time of MPI or when repair necessitates access to the affected part.
H. Weight and Balance
(1) None.
I. Electrical Load Data
(1) Not applicable.
J. Software Accomplishment Summary
(1) Not applicable.
K. References
(1) The sources of information used in the preparation of this service bulletin include
Honeywell engineering documentation and the documents listed in T able 5.
Table 5. Sources of Information
Part/Model Number
Heavy Maintenance
Manual
Light Maintenance
Manual
Illustrated Parts
Catalog 1
TFE731-4-1C NA 72-02-33 72-02-32
TFE731-4R-2S NA 72-02-33 72-02-32
TFE731-5R-1H NA 72-02-75 72-02-51
TFE731-5AR-1C NA 72-02-75 72-02-91
TFE731-5AR-2C NA 72-02-75 72-02-91
TFE731-5BR-1C NA 72-02-96 72-02-95
TFE731-5BR-1H NA 72-02-96 72-02-95
TFE731-5BR-2C NA 72-02-96 72-02-95
NOTE:
1. Affected Chapter/Section/Subject 72-50-05.
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SERVICE BULLETIN
TFE731
L. Other Publications Affected
(1) Same as those listed under Paragraph 1.K.(1).
M. Interchangeability or Intermixability of Parts
(1) Not applicabl e.
N. Acronyms and Abbreviations
(1) Refer to T able 6 for a list of the acronyms and abbreviations used in this service bulletin.
Table 6. List of Acronyms and Abbreviations
Term Full Term
AD Airworthiness Directive
ATA Air Transport Association
CAGE commercial and government entity
ECCN Export Cont rol Classification Number
FAA Federal Aviation Administration
ITT interstage turbine transition
LMM light maintenance manual
MPI major periodic inspection
MSP Maintenance Support Program
NA not appl icable
OHM overhaul manual
OSHA Occupational Safety and Health Administration
PN part number
Rev. revision
SB service bulletin
SFAR Special Federal Aviation Regulation
SIL service information letter
TSN time since new
TSO time since last overhaul
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SERVICE BULLETIN
TFE731
2. M aterial Information
A. Material - Price and Availability
(1) Information r egarding price and availability of parts may be obtained
from a Honeywe ll-authorized service facility. (Refer to SIL F731-3.)
You can also us e the “Dealer and Service Center Locator” tool at
https://myaerospace.honeywell.com/wps/myportal to find approved service locations.
Get the price and availability of parts from the Honeywell Product Catalog at
https://myaerospace.honeywell.com/wps/myportal. If the part is not in the catalog,
go to Honeywe ll, Aerospace Contact T eam, T elephone: 800-601-3099 (T oll Free
U.S.A./Canada), 602-365-3099 (International Direct).
B. Industry Sup port Information
(1) Send claims through the Honeywell MyAerospace web portal (www.myaerospace.com).
Select the Maintenance Plans tab and use the Claims-Maintenance Programs
sub-option.
(2) A special/warranty program may be available for this modification, under
certain con ditions, provided compliance recommendations of Paragraph 1.E.
are met. Information on special/warranty program and availability of parts
may be obtained from a Honeywell-authorized service facility. (Refer to SIL
F731-3.) Y ou can also use the “Dealer and Service Center Locator" tool at
https://myaerospace.honeywell.com/wps/my portal to find approved service locations.
(3) The warranty/program data is listed in T able 7.
NOTE: The procedures outlined in this service bulletin may be accomplished at the
Major Service Center level or greater.
Table 7. Warranty/Program Data
Warranty/Program Yes 12 No
Commercial Warranty
(Standard new engine warranty)
X
Spare Par t Warranty
(Standard new spare part warranty)
X
Special Extended Warranty Program Number
(Extension of either standard commercial warranty or spare part warranty may apply)
X
Special Program Number 88
(Programs in which special pricing and/or special conditions may apply)
X
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SERVICE BULLETIN
TFE731
Table 7. Warranty/Program Data (Cont)
Warranty/Program Yes 12 No
Special Pricing Notice Number
(Reduction from catalog list pricing, i.e., “P” condition pricing may apply)
X
MSP X
NOTES:
1. The costs of compliance with this service bulletin may be covered by Warranty, MSP , or other Programs
marked with an “X” in the “Yes” column, subject to the terms and conditions of the applicable Warranty, MSP ,
or other Programs contracts. This service bulletin in no way alters, modifies, or extends the terms of any
Warranty, MSP , or other Programs contract. For clarification or questions, contact Honeywell Warranty
Department at 800-601-3099, Domestic or 602-365-3099, International and select Option # 2.
2. Send claims through the Honeywell MyAerospace web portal (www.myaerospace.com). Select the
Maintenance Plans tab and use the Claims-Maintenance Programs sub-option.
C. Material Necessary for Each Engine
(1) The parts required to accomplish the instructions outlined in this service bulletin are
shown in T able 8. Refer to T able 9 for th e Instructions/Disposition Codes.
NOTE: Expendable parts, discarded in gaining access to the affected area of
the equipment, are not included.
Table 8. Operator-Purchased Material
New PN
Keyword/
Nomenclature Old PN Qty
Unit
Price 1
Instructions/
Disposition
Codes
3075292-4 2 ITT duct 3075292-4 1 O, T
NOTES:
1. Refer to Paragraph 2.A. for information regarding price and availability of parts.
2. If a replacement ITT duct is received is listed in T able 2 but is identified with "P35864", the ITT duct has been
reworked to replace the suspect aft flange, and is no longer affected by this service bulletin.
Table 9. Instructions/Disposition Codes
Code Description
Disposition Code O Replacement part is available on exchange basis. Contact your service facility for
details.
Disposition Code T Send the old part to Honeywell International Inc., Material Receiving, 1944 E Sky
Harbor Circle, Phoenix, AZ 85034-3440. Indicate on shipping paperwork that part is
unserviceable and is being returned per SB TFE731-72-3789.
D. Material Necessary for Each Spare
(1) The same as given in Paragraph 2.C.
E. Reidentified Parts
(1) Not applicable.
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SERVICE BULLETIN
TFE731
F . Tooling - Price and Availability
(1) No special tooling is required except that already listed in publications referenced
in Paragraph 1.K.(1).
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SERVICE BULLETIN
TFE731
3. A ccomplishment Instructions
A. General Information
(1) Obey the precautions.
NOTE: Publications listed in Paragraph 1.K.(1) provide applicable disassembly, cleaning,
inspection, reassembly, and testing instructions and shall be referred to during the
accomplishment of the following instructions.
NOTE: Service bulletins listed in Paragraph 1.B. shall be accomplished prior to or in
conjunction with the following instructions.
NOTE: Suspect ITT duct listed in T able 2 that have been reworked to correct the quality
escape addressed by this service bulletin will be identified with "P35864". ITT duct
identified with "P35864" are no longer affected by this service bulletin and may be
returned to service, provided they meet all other applicable inspection requirements.
B. Replace Ide ntified ITT duct
(1) Make sure a suspect ITT duct is installed prior to engine disassembly. Refer to
Paragraph 1.E. (Compliance).
(2) Disassemble engine as required to gain access to and remove the suspect ITT duct,
PN 3075292-4, in accordance with the applicable engine LMM.
(3) T ag the removed ITT duct as unserviceable per SB TFE731-72-3789, and return to
Honeywell in accordance with T able 9, Instructions/Disposition Codes.
(4) Replace suspect ITT duct with a serviceable ITT duct, PN 3075292-4, that is not
identified with a serial number listed in T able 2, or if listed in T able 2, is also identified
with "P35864".
(5) Reassemble engine in accordance with engine LMM.
(6) Check and ensure proper engine operation in accordance with airplane flight manual
and/or appropriate aircraft documents.
(7) Update the Component Maintenance/Modification Card for the removed and installed
ITT duct.
(8) Make an entry in the engine log book noting date of compliance, engine operating
time, part number(s) and serial number(s) of installed component(s) (as applicable),
and compliance with this service bulletin (and service bulletin revision number, if
applicable).
(9) Complete the Certificate of Compliance form in Paragraph 4.A. and send to Honeywell.
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SERVICE BULLETIN
TFE731
Blank Page
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Honeywell
SERVICE BULLETIN
TFE731
4.  Appendix
A.  Appendix A, Certificate of Compliance
To: Operator or Service Center Performing Modification
Upon modification of equipment, please fill in the information requested below, then mail or email the
completed Certificate of Compliance (refer to Figure 2) to:
Honeywell International Inc.
111 S 34th Street, Mail Stop 503-320
Phoenix, AZ 85034-2802
Email: engine.reliability@honeywell.com
Owner/Operator
Aircraft Model  Aircraft Serial Number
I certify that the following engine/equipment has been modified in accordance with the
listed service bulletins.
ENGINE/EQUIPMENT
NUMBER 1  NUMBER 2  NUMBER 3  NUMBER 4
PART NUMBER  PART NUMBER  PART NUMBER  PART NUMBER
MODEL NUMBER  MODEL NUMBER  MODEL NUMBER  MODEL NUMBER
SERIAL NUMBER  SERIAL NUMBER  SERIAL NUMBER  SERIAL NUMBER
TSN/TSO  TSN/TSO  TSN/TSO  TSN/TSO
CYCLES  CYCLES  CYCLES  CYCLES
SERVICE  SERVICE  SERVICE  SERVICE
BULLETIN  REV.  BULLETIN  REV.  BULLETIN  REV.  BULLETIN  REV.
NUMBER  NUMBER  NUMBER  NUMBER  NUMBER  NUMBER  NUMBER  NUMBER
NUMBER 1  NUMBER 2  NUMBER 3  NUMBER 4
Signature  Date  ID-306376
Repair Facility
Figure 2. (Sheet 1 of 1) Certificate of Compliance
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SERVICE BULLETIN
TFE731
EMAIL TO
engine.reliability@honeywell.com
23 Mar 2015 TFE731-72-3789
Revision 0, 23 Mar 2015 Page 18
Publication Number D201407000043
© Honeywell International Inc. Do not copy without express permission of Honeywell.

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