Honeywell International Inc.

111 S. 34th Street

Phoenix, Arizona 85034-2802
U.S.A.
CAGE: 99193
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Website: www.myaerospace.com

SERVICE BULLETIN
ENGINE - Convert Engine Models TFE731-3 to TFE731-3D and TFE731-3R to TFE731-3DR

Legal Notice

NOTICE: This is a CATEGORY 3, DURABILITY, MAINTAINABILITY, OR PRODUCT IMPROVEMENT

service bulletin.
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ECCN: EAR99, NLR Eligible.

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23 Jan 1996 TFE731-72-3568

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 SERVICE BULLETIN
TFE731

between you and Honeywell and may only be modified by a writing duly executed by the duly authorized
representatives of the parties.
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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Safety Data Sheets (OSHA Form 174 or equivalent) from the manufacturers or suppliers of the materials to
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Warranty/Liability Advisory
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/SFAR 36 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 1996, 2012 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: 20101101

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Transmittal Information

ATA Number TFE731-72-3568

Summary

The equipment changed in the revision(s) before this service bulletin may need additional changes. Refer to
Paragraph 3, Accomplishment Instructions.

This revision is a FULL replacement. This revision includes the changes that follow:
• Updated the modification kit to PN MK658566-8.

• Added compressor interstage diffusers, PN 3071722-14 and PN 3073749-2, to the list of alternate and
new parts.

The data 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 data that was moved or reformatted are not identified
with revision bars.

Revision History

This service bulletin has had six revision(s) as shown in Table 1.

Table 1. Revision History

Revision Number Revision Date
Initial Release 23 Jan 1996
1 18 Sep 1996
2 8 Jan 1997
3 26 Nov 2002
4 10 May 2004
5 15 Aug 2008
6 08 Mar 2012

Highlights

This section issues Revision 6 to Service Bulletin, ATA Number TFE731-72-3568 (Publication Number
TFE731-72-3568), 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 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.

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Page Description Effectivity

7 Paragraph 1.B.(1). Added Service Bulletin TFE731-72-3773 to the Concurrent All

Service Bulletin(s) table.
10 Paragraph 1.B.(2). Added Service Bulletin TFE731-72-3618 to the Optional All
Service Bulletin(s) table.
15 Paragraph 2.C.(4). Updated the source for the anti-seize compound from an All
address to a CAGE code.
16 Paragraph 2.F.(1). Updated the data to contact Honeywell in the third footnote to All
the Tooling - Price and Availability table.
17 Paragraph 3.A.(3). Changed LP compressor fourth stage static seal, PN All
3075339-3, from new part to alternate part in the Alternate/New Part Numbers
table.
17 Paragraph 3.A.(3). Changed washer, PN S9011Y199-085, from new part to All
alternate part in the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Added LP compressor fourth stage static seal, PN 3060334-1, All
as new part in the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Added washer, PN 3060367-1 as new part in the All
Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Added compressor interstage diffusers, PN 3073749-2 and All
PN 3071722-14, to the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Changed HP turbine rotor assembly, PN 3075777-1, from new All
part to alternate part in the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Changed HP turbine rotor assembly, PN 3075819-1, from All
alternate part to new part in the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Changed HP turbine disc, PN 3075772-1, from new part to All
alternate part in the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Added HP turbine disc, PN 3075814-1, as new part in the All
Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Added HP Turbine Blade, PN 3074758-8, as alternate part in All
the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Changed the new part number of the LP compressor fourth All
stage stator from 3074555-7, -9 to PN 3074555-10, in the Alternate/New Part
Numbers table.
17 Paragraph 3.A.(3). Changed the part number of the modification kit from 658566-2 All
to PN MK658566-8, in the first footnote to the Alternate/New Part Numbers table.
17 Paragraph 3.A.(3). Changed from Honeywell International Inc. to Honeywell in All
the third footnote to the Alternate/New Part Numbers table.

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Page Description Effectivity

17 Paragraph 3.A.(3). Added Footnote 14 for Pre Service Bulletin TFE731-72-3618 All
and referenced in Alternate/New Part Numbers table as applicable.
17 Paragraph 3.A.(3). Added footnote 15 for Post Service Bulletin TFE731-72-3618 All
and referenced in Alternate/New Part Numbers table as applicable.

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 SERVICE BULLETIN
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1. Planning Information

A. Effectivity
(1) This service bulletin is applicable to the turbofan aircraft engines given in Table 2.
Table 2. Applicable Engine(s)
PN Model Number Serial Number Application
1
3072800-1, -2, -4, -5 TFE731-3-1C Falcon 50
1
3072600-1, -3 TFE731-3-1F Jetstar II/L1329
1
3072500-1, -2, -4 TFE731-3-1G Westwind 1124
1
3072900-2, -3, -4, -6, -7, -8 TFE731-3-1H BAe HS125-SERIES
1
3074850-1, -3 TFE731-3-1K Jetstar II/L1329 (Springfield)
1
3073750-2, -3 TFE731-3R-1D Sabreliner 65/65A
(NA-265-65)
1
3074910-1 thru -4 TFE731-3R-1G Westwind 1124
1
3074000-1 thru -6 TFE731-3R-1H BAe HS125-SERIES
NOTE:
1. Engine serial number of engines converted from TFE731-3/-3R will be the serial number of the engine
being converted.

B. Concurrent Requirements
(1) The following 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.
Table 3. Concurrent Service Bulletin(s)
Service Bulletin Number Service Bulletin Title
TFE731-72-3001 (Rev 49 ENGINE – SERVICE LIFE – Service Life Limits of Critical Life Limited
or subsequent revisions) Components
TFE731-72-3057 (Rev 2 or ENGINE – LOW PRESSURE TURBINE ASSEMBLY – Install Improved Low
subsequent revisions) Pressure Turbine Rotating Seal
TFE731-72-3085 (Rev 11 ENGINE – FAN SPINNER – Replace Fan Spinner and Related Anti-Ice
or subsequent revisions) Components
TFE731-72-3124 (Rev 8 or ENGINE – ACCESSORY DRIVES – Modify Starter/Generator Drive Spur
subsequent revisions) Gearshaft
TFE731-72-3237 (Rev 3 or ENGINE – COMPRESSOR SECTION – Install HP Compressor Impeller,
subsequent revisions) Part No. 3073393-1, 3073394-1, 3073398-1/-2, 3073433-1, 3073434-1, or
3073435-1/-2 or 3075171-1/-2
TFE731-72-3367 ENGINE – TURBINE SECTION – Perform One Time Inspection of Nozzle
Throat (A5) Opening for Proper Dimension

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Table 3. Concurrent Service Bulletin(s) (Cont)

Service Bulletin Number Service Bulletin Title
TFE731-72-3370 ENGINE – TURBINE SECTION – Inspect and Rework Turbine Interstage
Transition Ducts, Part No. 3071486-X, 3072318-X and 3072726-X
TFE731-72-3405 (Rev 1 or ENGINE – TURBINE SECTION – Replace Shroud Retaining Sleeve, Part No.
subsequent revisions) 3070023-1 with Part No. 3070023-3 or 3070023-4
TFE731-72-3408 ENGINE – COMPRESSOR SECTION – Replace Spring Tension Washer, Part
No. 3000005-2/-56 with Part No. 3000005-64
TFE731-72-3409 (Rev 1 or ENGINE – COMPRESSOR SECTION – Install First Stage Compressor Wheel
subsequent revisions) Assembly Blade Retainer, Part No. 3075358-1
TFE731-72-3410 (Rev 1 or ENGINE – COMPRESSOR SECTION – Install Second Stage Compressor
subsequent revisions) Rotor Assembly Blade Retainer, Part No. 3075357-2
TFE731-72-3411 (Rev 1 or ENGINE – COMPRESSOR SECTION – Install Third Stage Compressor Rotor
subsequent revisions) Assembly Blade Retainer, Part No. 3075357-3
TFE731-72-3416 ENGINE – TURBINE SECTION – Install HP Impeller Shroud with an Improved
Aluminum Abradable Coating
TFE731-72-3421 ENGINE – COMPRESSOR SECTION – Install Compressor Bearing Housing,
Part No. 3071691-7 or 3077043-3
TFE731-72-3422 ENGINE – BY-PASS SECTION – Perform a One Time Inspection of Pinion
Gear Retainer Plate Assembly, Part No. 3072379-1, for Proper Rigid One-Piece
Type Nutplate, Part No. MS21070L3
TFE731-72-3426 ENGINE – TURBINE SECTION – Replace/Rework Third Stage LP Turbine
Nozzle, Part No. 3072342-2 to 3072342-4 or Part No. 3070014-3 to 3070014-5
TFE731-72-3429 ENGINE – COMPRESSOR SECTION – Replace Tie Bolt, Part No.
3070065-1/-4 with Part No. 3070065-3 or 3073049-1
TFE731-72-3449 ENGINE – COMPRESSOR SECTION – Install Washers, Part No.
S8154-2P025, on Bolts that Secure HP Shroud to HP Compressor Diffuser
TFE731-72-3476 ENGINE – TURBINE SECTION – Install HP Turbine Piston Ring Seal, Part
No. 3000002-10
TFE731-72-3482 ENGINE – TURBINE SECTION – Install LP Turbine Third Stage Rotor
Assembly, Part No. 3072848-3/-4 or 3074097-1, and Associated Parts
TFE731-72-3494 (Rev 7 or ENGINE – TURBINE SECTION – High Pressure Turbine (HPT) and Low
subsequent revisions) Pressure Turbine (LPT) Blade Hour Tracking and Turbine Blade Life Limits
TFE731-72-3498 ENGINE – BY-PASS SECTION – Install Fan Shaft and Ring Gear with New
Retaining Ring
TFE731-72-3524 ENGINE – BY-PASS SECTION – Install Retaining (Damper) Ring, Part No.
3072463-2
TFE731-72-3529 (Rev 2 or ENGINE – BY-PASS SECTION – Redesigned Fan Rotor Disc
subsequent revisions)

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Table 3. Concurrent Service Bulletin(s) (Cont)

Service Bulletin Number Service Bulletin Title
TFE731-72-3536 (Rev 1 or ENGINE – COMBUSTION SECTION – Install Combustion Chamber and Inner
subsequent revisions) Transition Liner (Controlled Fit /Low Smoke)
TFE731-A72-3544 ENGINE – TURBINE SECTION – Replacement of Specific Serial Numbered
First and Second Stage LP Turbine Disks Manufactured from the Same Heat Lot
TFE731-A72-3557 ENGINE – TURBINE SECTION – Replacement of Specific Serial Numbered
First and Second Stage LP Turbine Discs with Suspect Material Properties
TFE731-72-3662 (Rev 6 or ENGINE – Replace No. 4 and No. 5 Carbon Ring Seals and Associated
subsequent revisions) Vent/Oil System Components
TFE731-A72-3668 ENGINE – BY-PASS SECTION – Fan Rotor Disc Removal Schedule (Plan)
TFE731-72-3692 ENGINE – TURBINE SECTION – Install High Pressure Turbine (HPT)
Assembly, Part No. 3075777-1 or Part No. 3075778-1 (As Applicable)
TFE731-72-3773 ENGINE - COMPRESSOR SECTION - Introduction of Improved Stage 4 Case
and Vane Assemblies, PN 3074555-10, -11
TFE731-73-3075 ENGINE FUEL AND CONTROL – CONTROLLING – Replace Fuel Pump
Differential Pressure Indicator
TFE731-73-3083 ENGINE FUEL AND CONTROL – DISTRIBUTION – Replace Fuel Pump
Anti-Icing Valve
TFE731-73-3108 ENGINE FUEL AND CONTROL – DISTRIBUTION – Install Fuel Control P3
Sense Line Gasket, Part No. 3075481-1
TFE731-73-3110 ENGINE FUEL AND CONTROL – DISTRIBUTION – Replace Secondary
Flexible Hose Assembly (As Required) on Specific Identified Fuel Manifold
Assemblies
TFE731-73-3113 ENGINE FUEL AND CONTROL – DISTRIBUTION – Replace Fuel Heater
Outlet Adapter and Oil Transfer Tube
TFE731-73-3115 ENGINE FUEL AND CONTROL – CONTROLLING – Install Fuel Control
Incorporating a Minimum Modification Configuration Standard
TFE731-A73-3128 (Rev 1 ENGINE FUEL AND CONTROL – DISTRIBUTION – Install Flex Tube
or subsequent revisions) Assembly, Part No. 399-5500-0003 or 3074376-1
TFE731-73-3135 ENGINE FUEL AND CONTROL – DISTRIBUTION – Inspect/ Replace Flex Tube
Assembly, Part No. 3074376-1 (399-5500-0003) or 3074376-2 (As Applicable)
TFE731-74-3006 IGNITION – GENERAL – Install Ignition Igniter Plug, Part No. 3074541-1
TFE731-76-3054 ENGINE CONTROLS – POWER CONTROL – Install Surge Control Gasket,
Part No. 3075481-1
TFE731-77-3019 (Rev 2 or ENGINE INDICATING – TEMPERATURE – Install Thermocouple Harness,
subsequent revisions) Part No. 3073595-1
TFE731-A77-3020 ENGINE – TEMPERATURE – Remove and Replace Specific Serial Numbered
Thermocouple Lead Assemblies Listed in Table 1

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Table 3. Concurrent Service Bulletin(s) (Cont)

Service Bulletin Number Service Bulletin Title
TFE731-79-3050 (Rev 1 or OIL – DISTRIBUTION – Install Transfer Gearbox Oil Scavenge Transfer and
subsequent revisions) No. 6 Bearing Oil Scavenge Tubes Which Incorporate a Filter Screen and Add
a Fan Gearbox Oil Scavenge Screen
TFE731-79-3055 (Rev 2 or OIL – DISTRIBUTION – Replace Seal, Part No. 3020052-5/-16/-21 with Part
subsequent revisions) No. 3020052-24, in Air Breather Valve Assembly and Oil Nozzle Assembly, Part
No. 3072119-1 with Part No. 3072119-2, in Accessory Gearbox
TFE731-79-3066 (Rev 1 or OIL – DISTRIBUTION – Install Lube with Regulator and Scavenge Pump (Oil
subsequent revisions) Lube Pump), Part No. 3060785-2

(2) Review of the following should be accomplished by the operator for possible
incorporation at the time this service bulletin is accomplished.
Table 4. Optional Service Bulletin(s)
Service Bulletin Number Service Bulletin Title
TFE731-72-3078 ENGINE – POWER SECTION – Install New Bolts with Lockwire Feature
that Attach Transfer Tubes to Intermediate Case Assembly
TFE731-72-3120 ENGINE – COMPRESSOR SECTION – Replace LP Compressor Bearing,
Part No. 358736-1/-2 with Part No. 3072866-1
TFE731-72-3287 ENGINE – ACCESSORY DRIVES – Rework or Replace Accessory Drive
Gearbox Housing Assembly (Accessory Gearbox Rear Cover), Part No.
3071321-3 to Part No. 3071321-4
TFE731-72-3288 ENGINE – Modification to Provide Positive Retention of Engine Nameplate
TFE731-72-3293 ENGINE – ACCESSORY DRIVES – Replace Shim, Part No.
3070379-1/-2/-3 with Shim (Integral Seal), Part No. 3073493-1/-2/-3 at
Transfer Gearbox/Tower Shaft Housing Interface
TFE731-72-3304 ENGINE – BY-PASS SECTION – Replace/Rework Fan Disc Nut, Part
No. 3071981-1
TFE731-72-3413 ENGINE – COMBUSTION SECTION – Install Drain Valves, Part No.
868889-3, and Tee Plate, Part No. 3071835-1, that Incorporate Lockwire
Holes
TFE731-72-3455 (Rev 3 or ENGINE – ACCESSORY DRIVES – Install Packings, Part No. S9413-036,
subsequent revisions) and Seals, Part No. 3075506-2, on Tower Shaft Oil Transfer Tube
TFE731-72-3618 ENGINE – COMPRESSOR SECTION – Provide an Alternate LP
Compressor Fourth Stage Stator Seal, Part No. 3060334-1, With Required
Washers, Part No. 3060367-1
TFE731-72-3740 ENGINE - TURBINE SECTION - Install High Pressure Turbine (HPT) Rotor
Assembly, PN 3075819-1 or PN 3075821-1 (As Applicable)
TFE731-79-3032 (Rev 2 or OIL – DISTRIBUTION – Rework/Replace Number 6 Bearing Lubrication
subsequent revisions) Tube Assembly, Part No. 3073418-1 to Part No. 3073418-3

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Table 4. Optional Service Bulletin(s) (Cont)

Service Bulletin Number Service Bulletin Title
TFE731-79-3041 OIL – DISTRIBUTION – Replacement/Inspection/Rework of Chip Detector
TFE731-79-3064 (Rev 2 or OIL – DISTRIBUTION – Install Oil Lube and Scavenge Pump, Part No.
subsequent revisions) 3071949-12, That Incorporates an Improved Pressure Regulator Section

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C. Reason

(1) This service bulletin allows conversion of Engine Models TFE731-3 to TFE731-3D and
TFE731-3R to TFE731-3DR. The engines have improved turbine durability, higher ITT
temperature limits, and improved performance retention. The conversion will result
in increased ITT margins and reduced cost of ownership. This conversion does not
change Engine Model TFE731-3/-3R thrust rating.

D. Description

(1) This service bulletin allows conversion of Engine Models TFE731-3 to TFE731-3D and
TFE731-3R to TFE731-3DR. Conversion to TFE731-3D/-3DR engine models requires
prior or concurrent compliance with all service bulletins listed in Table 3 under the
heading “The following 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.”

E. Compliance

(1) Compliance addresses durability, maintainability, or product improvement.

(2) The procedures outlined in this service bulletin should be performed during a
compressor zone inspection (CZI) or major periodic inspection (MPI) at a Heavy
Maintenance Facility only.
Table 5. Warranty/Program Data
Warranty/Program Yes No
Commercial Warranty X
(Standard new engine warranty)
Spare Part Warranty X
(Standard new spare part warranty)
Special Extended Warranty Program Number X
(Extension of either standard commercial warranty or spare part warranty)
Special Program No. 20 X
(Programs in which special pricing and/or special conditions may apply)
Special Pricing Notice No. X
(Reduction from catalog list pricing, i.e., “P” condition pricing)
MSP X

F. Approval

(1) The engine model conversion authorized by this service bulletin complies with
applicable Federal Aviation Regulations and is FAA approved.

G. Manpower

(1) Not applicable.

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H. Weight and Balance

(1) Weight difference resulting from incorporation of component parts listed in Section
2 is plus (+) 13.0 pounds. The aircraft weight and balance is as indicated in the
Supplemental Type Certificate (STC) listed below.
(a) Falcon 50, ST341CH-D.
(b) Hawker 400/600/700, ST456CH-D.
(c) Westwind 1124, ST458CH-D.
(d) Jetstar, ST459CH-D (Jetstar II/L1329, Springfield).

I. Electrical Load Data

(1) Not applicable.

J. Software Accomplishment Summary

(1) Not applicable.

K. Publications References

(1) The sources of information used in the preparation of this service bulletin include
Honeywell engineering documentation and the documents listed in Table 6.
Table 6. Sources of Information
Heavy Maintenance Light Maintenance Illustrated Parts
Part/Model Number Manual Manual Catalog
1 1 1
TFE731-3-1C 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3-1F 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3-1G 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3-1H 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3-1K 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3R-1D 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3R-1G 72-02-71 72-02-15 72-00-74
1 1 1
TFE731-3R-1H 72-02-71 72-02-15 72-00-74
NOTE:
1. Refer to Paragraph 3 for use.

L. Other Publications Affected

(1) Not applicable.

M. Interchangeability or Intermixability of Parts

(1) Not applicable.

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2. Material Information

A. Material - Price and Availability

(1) Parts required are contained in Paragraph 3. All removed hardware becomes the
property of Honeywell.

B. Industry Support Information

(1) A special program may be available for this modification, under certain conditions,
providing compliance recommendations of Paragraph 1.E. are met. Information
on special program and availability of parts may be obtained from a Honeywell
authorized service facility. (Refer to Service Information Letter (SIL) F731-3.) A
listing of authorized service facilities is also available on the e-engines website
(www.e-engines.honeywell.com).

C. Material Necessary for Each Engine

(1) The following parts in Table 7 are reworkable and must be returned within 48 hours
after their removal. The parts are to be shipped to the address listed below Table 7.
Table 7. Reworkable Parts
PN Keyword/Nomenclature
3072319-4, -6, -9, -11 LP Turbine First Stage Nozzle
3072340-1, -4, -5 LP Turbine Second Stage Nozzle
3072160-1, -2 Fan Support Housing Assy

Honeywell International Inc.

Fast Shop
1944 East Sky Harbor Circle
Phoenix, AZ 85034-3440

(2) The following parts in Table 8 are reworkable and must be returned within 48 hours
after their removal. The parts are to be shipped to the address listed below Table 8.
Table 8. Reworkable Parts
PN Keyword/Nomenclature
3071722-3 thru -7, 3070043-4, or 3077013-All (where Compressor Interstage Diffuser
All denotes all dash numbers)
3072678-5, -8, -11, 3072410-All, 3077049-All, or HP Compressor Diffuser
3073386-1
3072318-1, -3 Turbine Interstage Transition Duct (Review Service
Bulletin TFE731-72-3309 (FAA Airworthiness Directive
86-03-01) for Accomplishment)
3070023-1 Shroud Retaining Sleeve
3071431-3, -4, -7, -8 Thrust and Exhaust Nozzle

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Honeywell International Inc.

Material Receiving
1944 East Sky Harbor Circle
Phoenix, AZ 85034-3440
(3) The following parts in Table 9 must also be returned but in normal time frames. The
parts are to be shipped to the address listed below Table 9.
Table 9. Special Program Return Parts
PN Keyword/Nomenclature
3072543-1, -3, -4, -5 LP Turbine Third Stage Rotor Assy
3074555-4 LP Compressor Fourth Stage Stator
3072398-1, -2 LP Fourth Stage Compressor Disc
3072327-2 thru -7, 3072327-9, 3077022-1, -2 Outer Transition Liner
3072314-2 HP Turbine Rotor Assy
3072352-1 thru -4 LP First Stage Turbine Rotor Assy
3072541-1 thru -4 LP Second Stage Turbine Rotor Assy
3072448-All, 3072674-All, 3073482-All, 3077002-All Combustion Chamber Liner
3072337-All Inner Transition Liner
3072344-1 thru -8, 3073428-1, -2 HP Turbine Blade Shroud Segment

Honeywell International Inc.

Special Program Return Hardware
1944 East Sky Harbor Circle
Phoenix, AZ 85034-3440
(4) Materials and compounds required to do this service bulletinare given in Table 10.
Table 10. Materials and Compounds
1
Number Description
Liquid nitrogen (A-A-59503) (Commercially available)
Anti-seize compound (C5-A Copper Based)
CAGE: 05972
NOTE:
1. NOTE: Equivalent substitutes may be used for listed items.

D. Material Necessary for Each Spare

(1) The same as given in Paragraph 2.C.

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E. Reidentified Parts
(1) Refer to Table 11 for the reidentified parts data.
Table 11. Reidentified Parts
New PN Keyword/Nomenclature Old PN
3071770-4 LP Compressor Case 3071770-2

F. Tooling - Price and Availability

(1) The ground support equipment in Table 12 is required to accomplish the instructions
outlined in this service bulletin.
Table 12. Tooling - Price and Availability
PN Nomenclature Unit List Price
1 2
Balancing machine
(Gisholt Model 1S or 13S)
1 3
289905-1, -2 Rotating assembly balancing kit
NOTES:
1. Equivalent substitutes may be used for listed items.
2. Manufacturers address: Giddings and Lewis Inc, 142 Doty St, Fond Du Lac, WI 54935 or Gisholt Machine
Co, 1245 E Washington Ave, Madison, WI 53701
3. Information regarding price and availability of ground support equipment may be obtained from Honeywell,
Global Customer Care Center, Telephone: 800-601-3099 (Toll Free U.S.A./Canada), 602-365-3099
(International Direct), 00-800-601-30999 (EMEA Toll Free), 420-234-625-500 (EMEA Direct).

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3. Accomplishment Instructions

A. Convert Engine Model TFE731-3 to TFE731-3D and TFE731-3R to TFE731-3DR

(1) Disassemble engine and remove parts as required in accordance with Engine Light
and Heavy Maintenance Manuals, 72-02-15 and 72-02-71.
(2) Install parts listed in the new/alternate part number column and in the “NOTES”
following the parts listing in Table 13 in accordance with Engine Light and Heavy
Maintenance Manuals, 72-02-15 and 72-02-71.
(3) Parts not replaced by this conversion service bulletin or replaced by a service bulletin
listed in Paragraph 1.B. can be reused if serviceable.
NOTE: Part numbers indicated with a dot (.) under another part number are a
component of that part.
Table 13. Alternate/New Part Numbers
Note Alternate PN New PN Qty Nomenclature
9
3073563-2 1 Fan Disc
(Refer to Service Bulletin 30 Adapter
TFE731-72-3529 (Rev 2
or subsequent revisions))
8
3075351-5 1 LP Fourth Stage
Compressor Rotor Assy
.525-595-9105 8 Nut, LP Fourth Stage
Compressor Rotor Assy
.145-131-9007 8 Bolt, LP Fourth Stage
Compressor Rotor Assy
1
.3075326-3 1 Compressor Disc, LP
Fourth Stage Compressor
Rotor Assy
1
.3075327-2 1 LP Compressor Fourth
Stage Rotor Seal
.3072402-1, -3, -4, -5, -6 42 Compressor Blade, LP
Fourth Stage Compressor
Rotor Assy
.3072454-2 42 Blade Retainer
2 10
3077077-1, -2, -3, -4 3074803-4 1 Shouldered Shaft, LP
Fourth Stage Compressor
Rotor Assy
1 14 15
3075339-3 3060334-1 1 LP Compressor Fourth
Stage Static Seal
1
MS9489-08 6 Bolt
1 14 15
S9011Y199-085 3060367-1 6 Washer

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Table 13. Alternate/New Part Numbers (Cont)

Note Alternate PN New PN Qty Nomenclature
3
3073749-2 3071722-14 1 Compressor Interstage
Diffuser
3
3077096-1 thru -8 3072678-12, -14 1 HP Compressor Diffuser
1
3075126-1 1 Diffuser Vane Deswirl
1
3073525-3 3073632-2 1 Outer Transition Liner
4 8
3072843-9 1 HP Turbine Nozzle (A4)
Assembly
.3072844-4, -5, -6 AR Nozzle Segment
3077089-1, -2, -3 .3074783-7, -8, -9 AR Nozzle Segment
.3075413-1 1 Transition Liner
1
.3072746-8 1 Anti-Rotation Ring
.3072338-1, -2, -3, -4 S1 Air Seal Support
1
.3074984-1 1 Nozzle Support
13
.MS35650-304 3 Nut
.3072339-1 2 Segment Flange
.MS9581-09 18 Key Washer
.MS9489-04 18 Bolt
13
.AN3-3A 3 Bolt
3072344-2, -4, -7 3073374-1, -3, -4, -7, -11 6 HP Turbine Blade Shroud
3077036-2, -4, -7 Segment
1
3072413-4 1 HP Turbine Coupling Shaft
.3073609-5 1 Metal Ring (“V”) Seal
1 7
3075777-1 3075819-1 1 HP Turbine Rotor Assy
3075772-1 .3075814-1 1 HP Turbine Disc
3074785-8 .3074785-8 62 HP Turbine Blade
or
3074786-9 1 HP Turbine Rotor Assy
.3075227-1, -2 1 HP Turbine Disc
.3074785-8 62 HP Turbine Blade
CAUTION: NO PATCHES ARE ALLOWED ON THE ID OF THE
INNER BAND ON FIRST STAGE NOZZLE ASSEMBLY DUE
TO CLEARANCES REQUIRED FOR THE LP TURBINE FIRST
STAGE ROTATING SEAL, PN 3073735-1.

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Table 13. Alternate/New Part Numbers (Cont)

Note Alternate PN New PN Qty Nomenclature
3 8
3072842-8 3072842-10 1 LP First Stage Turbine
Nozzle Assy
.3073765-10 .3073765-10 1 LP Turbine First Stage
Nozzle Seal
.3073764-2 .3073764-4 1 LP Turbine First Stage
Nozzle Support
1
3072834-4 1 HP Turbine Aft Coupling
Shaft
3
3072318-4 1 Turbine Interstage
Transition Duct
6 8
3072333-9 1 LP Turbine Stub Shaft Assy
1
.3072334-7 1 Shaft Seal, LP Turbine
Shaft and Seal Assy
2 11
3077083-1 .3072335-3 1 Half-Shaft Coupling, LP
Turbine Shaft and Seal
Assy
1
.3073735-1 1 Seal Plate, LP Turbine Shaft
and Seal Assy
.MS9489-06, -07 S12 Bolt
.525-613-9005 12 Nut
1 7
3074078-2 1 LP Turbine First Stage
Rotor Assy
.3074098-1 86 Turbine Blade
.3074076-2 1 LP Turbine First Stage
Rotor Disc
.3074009-1 43 Platform (Feather) Seal
1
3074079-2 1 LP Turbine Second Stage
Rotor Assy
.3074099-1 84 Turbine Blade
.3074077-1 1 LP Turbine Second Stage
Rotor Disc
.3073609-3 1 Metal Ring (“V”) Seal (Fwd)
.3073609-2 1 Metal Ring (“V”) Seal (Aft)
3 8
3072340-7 1 LP Turbine Second Stage
Nozzle
.3074075-2 1 Air Seal

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Table 13. Alternate/New Part Numbers (Cont)

Note Alternate PN New PN Qty Nomenclature
.3071636-1 18 Nozzle Spacer
.3071633-1 1 Retainer Ring
.NAS1198-4-6 18 Rivet
2 12
3072780-2 1 Tie Shaft
2 5
3071770-4 1 LP Compressor Case
1
3074555-10 1 LP Compressor Fourth
Stage Stator
3
3077082-1, -2, -3 3072160-3 1 Fan Support Housing
Assembly
NOTES:
1. Will be furnished with Modification Kit, PN MK658566-8.
2. Existing part may be reworked into another part number configuration.
3. Return part to Honeywell, Phoenix, Arizona for rework. Refer to Paragraph 2.C.(2)
4. For HP turbine nozzle (A4) assembly (Ae=13.60-14.34 square-inches).
5. Refer to Paragraph 3.B. for instructions to rework LP Compressor Case, Part No. 3071770-2 to Part No.
3071770-4.
6. Refer to Paragraph 3.C. for assembly instructions.
7. The following “CAUTION” applies when handling the rotor assembly.

CAUTION: WHEN HANDLING THE ROTOR ASSEMBLY, CARE MUST BE TAKEN TO

ENSURE THE TURBINE BLADES DO NOT FALL OUT. DUE TO BLADE
CONSTRUCTION, NOTHING IS HOLDING THE BLADES IN PLACE AND BLADES
COULD FALL OUT OF DISC DURING HANDLING. SHOULD THE BLADES COME
OUT, THE DISC MAY FALL, CAUSING INJURY TO PERSONNEL OR DAMAGE
TO THE DISC.
8. Assembly part number change when listed detail parts are used.
9. Refer to Service Bulletin TFE731-72-3529 for Fan Disc, PN 3073563-2, and Adapter, PN 3073566-3
or 3073722-1 (as applicable).
10. Refer to Service Bulletin TFE731-72-3510RWK for instructions to rework LP fourth stage compressor
shouldered shaft.
11. Refer to Service Bulletin TFE731-72-3250RWK for instructions to rework LP Turbine Half-Shaft Coupling, PN
3072335-1 to PN 3072335-2, and Service Bulletin TFE731-72-3511RWK for instructions to rework LP Turbine
Half-Shaft Coupling, PN 3072335-2 to PN 3077083-1.
12. Refer to Service Bulletin TFE731-72-3512RWK for instructions to rework Tie Shaft, PN 3072780-1 to PN
3072780-2.
13. Used for handling purposes only.
14. Pre Service Bulletin TFE731-72-3618 (optional).
15. Post Service Bulletin TFE731-72-3618.

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(4) Reidentify converted engine as follows.

(a) Upon completion of this conversion accomplish the following.
1 Obtain a replacement engine identification plate if needed. Contact,
Honeywell, Dept 67-60 (Business Manager) or, Dept 84-10
(Production QA) for replacement plate.
2 Stamp existing information on replacement or existing engine
identification plate except for the changes in Table 14 and Table 16.
a TFE731-3 to TFE731-3D in Table 14.
Table 14. TFE731-3 to TFE731-3D
MODEL TFE731-3D
PART Refer to Table 15 for PN
SERIES
SERIAL
EQUIP CODE
RATING:
MAXIMUM
MAX CONT
5 MIN
TYPE CERT
PROD CERT
OIL SPEC
FUEL SPEC
CONTRACT
STOCK
MFG DATE
FAR 34

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Table 15. Engine Part Numbers and Model Numbers

From To
PN Model No. PN Model No.
3072800-1, -2, -4, -5 TFE731-3-1C 3074570-1 TFE731-3D-1C
3072500-1, -2, -4 TFE731-3-1G 3073790-1 TFE731-3D-1G
3072900-2, -3, -6 TFE731-3-1H 3074580-1 TFE731-3D-1H
3072900-4, -7 TFE731-3-1H 3074580-2 TFE731-3D-1H
3072600-1, -3 TFE731-3-1F
or
3074850-1, -3 TFE731-3-1K 3074050-1 TFE731-3D-1K

b TFE731-3R to TFE731-3DR in Table 16.

Table 16. TFE731-3R to TFE731-3DR
MODEL TFE731-3D
PART Refer to Table 17 for PN
SERIES
SERIAL
EQUIP CODE
RATING:
MAXIMUM
MAX CONT
5 MIN
TYPE CERT
PROD CERT
OIL SPEC
FUEL SPEC
CONTRACT
STOCK
MFG DATE
FAR 34

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Table 17. Engine Part Numbers and Model Numbers

From To
PN Model No. PN Model No.
3074910-1, -2, -3, -4 TFE731-3R-1G 3074010-1 TFE731-3DR-1G
3074000-1 thru -6 TFE731-3R-1H 3074590-1 TFE731-3DR-1H
3073750-2, -3 TFE731-3R-1D 3070120-1 TFE731-3DR-1D

c Stamp the letter “C” following the serial number to denote

conversion.
(b) Make an entry in Engine Log Book (engine data page) noting new (converted)
engine model and part number.
CAUTION: DO NOT USE A WATER MANOMETER TO CHECK CAVITY PRESSURES.
AFTER COMPLIANCE WITH SERVICE BULLETIN TFE731-72-3596, THE
CAVITY PRESSURES WILL TYPICALLY BE NEGATIVE. TO CHECK 4/5
SEAL CAVITIES AND FAN GEARBOX PRESSURES, A COMPOUND GAGE
CAPABLE OF MEASURING PLUS OR MINUS 10 PSI SHOULD BE USED.
(5) Upon completion of engine reassembly, check and ensure proper engine operation in
accordance with Engine Heavy Maintenance Manual except as follows.
(a) Refer to the engine operating limits of the engine model converted from
except for the following.
1 ITT Limit.
a TFE731-3D = 910 C.
b TFE731-3DR = 929 C.
2 Delete (do not perform) Adjustment Test, Step 3.0.(6), perform only
Vent Pressure System Pressure Check and associated Figure 504.
(b) EEC, reset ITT limiter as follows.
1 TFE731-3D = 911 C ± 1 C.
2 TFE731-3DR = 938 C ± 1 C.
(c) Set fuel control manual mode from 890 to 910 C.
(d) If MEDRA version 4.1 or earlier is used to perform Test Data Reduction, identify
the engine model as the engine model converted from, and reduce the data.
(6) Make entry in 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).
(7) Complete the Record of Conversion form and send to the pre-printed address. Contact
a local Honeywell authorized service center to obtain forms, if required.

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B. Rework LP Compressor Case, PN 3071770-2 to PN 3071770-4

(1) Position 831376-1 compressor case fixture drill guide on Surface (Datum) B (ensure
that alignment pin on tool is in alignment hole on Surface (Datum) B and secure with
bolts. (See Figure 1.)
(2) Locate and drill one hole 0.210 to 0.215 inch diameter through Surface (Datum) B.
(See Figure 1.)
(3) Deburr reworked area.
(4) Line through existing dash number (3071770-2), and reidentify LP compressor case as
PN 3071770-4, using electrochemical etch process per Aerospace Standard AS478,
Method 7A2, to a maximum depth of 0.001 inch.

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Figure 1. (Sheet 1 of 1) Rework LP Compressor Case, PN 3071770-2 to PN 3071770-4

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C. Assembly Instructions for LP Turbine Shaft and Seal Assembly, PN 3072333-9

(1) The materials and compounds given in Table 10 and equipment listed in Table 12
are required to do this service bulletin.
CAUTION: USE CARE WHEN HANDLING COMPONENTS WITH CURVIC COUPLINGS.
CAUTION: USE PROTECTIVE EQUIPMENT WHEN HANDLING HEATED COMPONENT
PARTS TO PREVENT PERSONAL INJURY.
(2) Heat Seal Plate, PN 3073735-1, to 300 to 350 F for 1 hour in a preheated temperature
controlled oven.
NOTE: Seal plate is required to be heated and coupling to be chilled prior to
assembly, due to tight interference fit.
WARNING: USE PROTECTIVE EQUIPMENT (EYES, HANDS, ETC) WHEN USING
LIQUID NITROGEN AS SERIOUS PERSONAL INJURY CAN RESULT IF
IT SPLASHES ON YOU.
(3) Cool Coupling (seal/seal plate end), PN 3072335-3/3077083-1, in liquid nitrogen for
approximately 5 to 10 minutes.
NOTE: Paragraph 3.C.(3) must be accomplished quickly, after coupling is removed
from liquid nitrogen there is approximately 30 seconds to assemble seal
plate to coupling. Alignment pins will assist in hole alignment.
(4) Assemble heated seal plate to chilled coupling, ensure bolt holes are aligned and seal
plate seats fully on coupling. (See Figure 2.)
(5) Assemble Seal, PN 3072334-7, to seal plate and coupling. By design, there is a
slight interference fit between seal and seal plate, which will require the seal to be
chilled prior to assembly.

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Figure 2. (Sheet 1 of 1) Assembly of LP Turbine Shaft and Seal Assembly, PN 3072333-9

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(6) Using anti-seize compound (C5-A Copper Based) on threads, as required, secure
seal and seal plate to coupling using 12 Bolts, PN MS9489-07, and 12 Nuts, PN
525-613-9005, as follows.
(a) Install Bolts, PN MS9489-07, in each hole.
(b) Secure bolts with Nuts, PN 525-613-9005. Snug tighten only, do not torque.
(7) Balance LP turbine shaft and seal assembly as follows.
(a) Adapt LP turbine shaft and seal assembly (coupling) to standard balancing
machine using 290562-1 and 290701-1 couplings on coupling curvic
couplings, 290566-32 tie bolt, and 290565-1 nut.
(b) Dynamic balance LP turbine shaft and seal assembly on curvic couplings
(Datums H and J) to an accuracy of 0.02 ounce-inch maximum in Plane
M. (See Figure 3.)
CAUTION: DO NOT REMOVE ANY MATERIAL FROM BOLT HEADS TO
ACHIEVE BALANCE REQUIREMENTS.
(c) To achieve balance requirements, the following methods may be used. Do not
remove any material from bolt heads to achieve balance requirements.
1 A shorter Bolt(s), PN MS9489-06, may be used in place of PN
MS9489-07.
2 Material may be removed from Seal, PN 3072334-7, as indicated in
Figure 3. If material is removed, the resultant fillet shall have a radius
of 0.125 inch minimum and a surface finish of AA125 or better.
NOTE: Two methods of achieving balancing requirements are provided for
ease of balancing. A shorter Bolt, PN MS9489-06, may be installed
in place of PN MS9489-07, or material may be removed from Seal,
PN 3072334-7. (See Figure 3.)
(8) Tighten Nuts, PN 525-613-9005, to a torque of 40 inch-pounds.
(9) Visually inspect curvic couplings to ensure cleanliness and that no damage has
occurred.
(10) Identify part as PN 3072333-9 in the area of existing serial number and lot number on
Seal Plate, PN 3073735-1, using electrochemical etch method to a maximum depth
of 0.001 inch. (See Figure 4.)

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Figure 3. (Sheet 1 of 1) Assembly of LP Turbine Shaft and Seal Assembly, PN 3072333-9

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Revision 6, 8 Mar 2012 Page 29
Publication Number TFE731-72-3568
© Honeywell International Inc. Do not copy without express permission of Honeywell.
 SERVICE BULLETIN
TFE731

Figure 4. (Sheet 1 of 1) Assembly of LP Turbine Shaft and Seal Assembly, PN 3072333-9

23 Jan 1996 TFE731-72-3568

Revision 6, 8 Mar 2012 Page 30
Publication Number TFE731-72-3568
© Honeywell International Inc. Do not copy without express permission of Honeywell.