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# SERVICE BULLETIN
ENGINE - TURBINE SECTION - Replace Specific Identified Low Pressure Second Stage Turbine (LPT2) Rotor Blad es, PN 3075424-2, -3 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, NLR Eligible. 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. and Honeywell Intellectual Properties Inc. (collectively "Honeywell"). 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-subsidiaries or a formally designated third party service provider; and direct recipients of Materials from Honeywell’s Aerospace Technical Publication Distribution. The terms and conditions of this License Agreement govern your use of these Materials, except to the extent that any terms and conditions of another applicable agreement with Honeywell regarding the operation, maintenance, or repair of Honeywell aerospace products conflict with the terms and conditions of this License Agreement, in which case the terms and conditions of the other agreement will govern. However, this License Agreement will govern in the event of a conflict between its terms and conditions and those of a purchase order or acknowledgement.

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1. License Gra nt - 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 license to use these Materials to operate, maintain, or repair Honeywell aerospace products only in accordance with that agreement. If you are a direct recipient of these Materials from Honeywell’s Aerospace Technical Publication Distribution and are not a party to an agreement related to the operation, maintenance or repair of Honeywell aerospace products, Honeywell hereby grants you a limited, non-exclusive license to use these Materials to maintain or repair the subject Honeywell aerospace products only at the facility to which these Materials have been shipped ("the Licensed Facility"). Transfer of the Materials to another facility owned by you is permitted only if the original Licensed Facility retains no copies of the Materials and you provide prior written notice to Honeywell. 2. Rights In Materials - Honeywell retains all rights in these Materials and in any copies thereof that are not expressly granted to you, including all rights in patents, copyrights, trademarks, and trade secrets. No license to use any Honeywell trademarks or patents is granted under this License Agreement. 3. Confidentiality - You acknowledge that these Materials contain information that is confidential and proprietary to Honeywell. You agree to take all reasonable efforts to maintain the confidentiality of these Materials. 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 Material s - Unless you have the express written permission of Honeywell, you may not make or permit making of copies of the Materials. Notwithstanding the foregoing, you may make copies of only portions of the Material for your internal use. You agree to return the Materials and any copies thereof to Honeywell upon the request of H oneywell. 6. Term - This License Agreement is effective until terminated as set forth herein. This License Agreement will terminate immediately, without notice from Honeywell, if you fail to comply with any provision of this License Agreement or will terminate simultaneously with the termination or expiration of your applicable product support agreement, authorized repair facility agreement, or your formal designation as a third party service provider. Upon termination of this License Ag reement, you will return these Materials to Honeywell without retaining any copies and will have one of your authorized officers certify that all Materials have been returned with no copies retained. 7. Remedies - Honeywell reserves the right to pursue all available remedies and damages resulting from a breach of this License Agreement. 8. Limitation of Liability - Honeywell does not make any representation regarding the use or sufficiency of the Materials. THERE ARE NO OTHER WARRANTIES, WHETHER WRITTEN OR ORAL, EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, (i) WARRANTIES ARISING FROM COURSE OF PERFORMANCE, DEALING, USAGE, OR TRADE, WHICH ARE HEREBY EXPRESSLY DISCLAIMED, OR (ii) WARRANTIES AGAINST INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES, EVEN IF HONEYWELL HAS BEEN ADVISED OF ANY SUCH INFRINGEMENT. IN NO EVENT WILL HONEYWELL BE LIABLE FOR ANY INCIDENTAL DAMAGES, CONSEQUENTIAL DAMAGES, SPECIAL DAMAGES, INDIRECT DAMAGES, LOSS OF PROFITS, LOSS OF REVENUES, OR LOSS OF USE, EVEN IF INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. TO THE EXTENT PERMITTED BY APPLICABLE LAW, THESE LIMITATIONS AND EXCLUSIONS WILL APPLY REGARDLESS OF WHETHER LIABILITY ARISES FROM BREACH OF CONTRACT, WARRANTY, TORT (INCLUDING BUT NOT LIMITED TO NEGLIGENCE), BY OPERATION OF LAW, OR OTHERWISE. 9. Controlling Law - This License shall be governed and construed in accordance with the laws of the State of New York without regard to the conflicts of laws provisions thereof. This license sets forth the entire agreement

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between you an d Honeywell and may only be modified by a writing duly executed by the duly authorized representatives of the parties. Safety Advisory WARNING: BEFO RE 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, solvents, pa ints, and other commercially available materials. The user of this publication must get the Material Safety Data Sheets (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 an d cautions set forth for the safe use, handling, storage, and disposal of the materials. Warranty/L iability 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/SFA R 36 REPAIR AUTHORIZATION. NEITHER DOES HONEYWELL ASSUME RESPONSIBILITY FOR SPECI AL TOOLS AND TEST EQUIPMENT FABRICATED BY COMPANIE S OTHER THAN HONEYWELL. WARNING: INCORRECTLY REPAIRED COMPONENTS CAN AFFECT AIRWORTHINESS OR DECREASE THE LIFE OF T HE COMPONENTS. INCORRECTLY FABRICATED SPECIAL TOOLING OR TEST EQUIPMENT CAN RESULT IN DAMAGE TO THE PRODUCT COMPONENTS OR GIVE UNSATISFACTORY RESULTS. 

## Copyright - Notice Copyright 2010 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: 20080902, VERSION 0017A (HT)

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Transmittal I nformation ATA Number TFE 731-72-5221 (Publication Number D201010000006) Summary This is the INI TIAL release. Revision History This service b ulletin has had no revision(s) as shown in Table 1. Table 1. Revis ion History Revision Number Revision Date 0 11 Nov 2010

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1. P l a n n i n g I n fo rm at i o n A. Effectivity (1) This is a CATEGORY 1, SAFETY service bulletin. (2) This service bulletin is applicable to the turbofan aircraft engines shown in Table 2. Table 2. Ap plicable Engine(s)

PN Model Number Prior to Se rial Number 1 Application 3060020-8 thru -14 TFE731-20R-1B 111223 2 Learjet 45 3060082-2, -3, -4, -6, -7 TFE731-2 0AR-1B 132195 2 Learjet 4 0/45 3060084-1, -2 TFE731-20BR-1B Learjet 40/40XR/45/45XR 3062020-1 TFE731-40AR-200G 126286 2 G150 3060040-4, -5 TFE731-40R-200G G100 (Astra SPX) 3060050-1 TFE731-40-1C Falcon 50EX/50-40 3060090-1 TFE731-50R-1H 122395 2 Hawker 900XP 3060000-4 TFE731-60-1C 112964 2 Falcon 900EX/900DX NOTES: 1. Refer to Paragraph 1.E. and Table 4 and Table 5 to determine the applicability of this service bulletin to your engine. 2. This service bulletin affects engines having serial numbers prior to the listed serial number. B. Concurrent Requirements (1) Not applicable. W

A R N I N G : FAILURE TO COMPLY WITH THIS SERVICE BULLETIN COULD RESULT IN DISTRESS TO THE LPT2 ROTOR BLADES, PN 3075424-2, -3, AND THIRD STAGE LOW PRESSURE TURBINE (LPT3) NOZZLE ASSEMBLY, PN 3060655-6. IF LEFT UNCORRECTED, THIS DISTRESS COULD RESULT IN AN UNCONTAINED LOW PRESSURE TURBINE (LPT) ROTOR DISC EVENT AND COULD RESULT IN SERIOUS INJURY OR DEATH TO PERSONNEL, AND LOSS OF OR DAMAGE TO THE AIRCRAFT. C. Reason (1) Problem: Some LPT2 rotor blades, PN 3075424-2, -3, produced from specific machining lots were machined with an aft discourager that was longer than the design requirement. During certain engine operating conditions, it is possible for these LPT2 rotor blades, PN 3075424-2, -3, to contact the LPT3 nozzle assembly, PN 3060655-6, causing rub damage to the LPT2 rotor blades, PN 3075424-2, -3, and LPT3 nozzle assembly, PN 3060655-6. This rub damage, if s evere, could result in the separation of the LPT3 nozzle assembly, PN 3060655-6, which would cause an engine shutdown and a possible uncontained LPT disc event. LPT2 rotor blades, PN 3075424-2, -3, are used in LPT2 rotor assembly, PN 3060608-2, -3, -5.

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(2) Background: During a routine replacement of LPT2 rotor blades, PN 3075424-2, -3, it was noticed that the new LPT2 rotor blades, PN 3075424-2, -3, being installed had aft discouragers that were approximately 0.020 inch (0.51 mm) longer than the existing LPT2 rotor blades, PN 3075424-2, -3. Further investigation revealed that the aft discouragers of the new LPT2 rotor blades, PN 3075424-2, -3, did not meet the design requirements. Only LPT2 rotor blades, PN 3075424-2, -3, manufactured from specific machining lots are affected. The suspect lots of LPT2 rotor blade, PN 3075424-2, were manufactured between March 2009 and September 2010. The suspect lots of LPT2 rotor blade, PN 3075424-3, were manufactured between July 2010 and September 2010. Initially, four new production engines with LPT2 rotor blades, PN 3075424-2, -3, from the affected machining lots were disassembled and inspected. Two of these engines had light contact marks on the LPT3 nozzle assembly, PN 3060655-6. Honeywell has subsequently ins pected an additional 39 engines with suspect LPT2 rotor blades with no evidence of contact between the LPT2 blade discouragers and the LPT3 nozzle. There have been no reported engine shutdowns due to this condition. LPT2 rotor blades, PN 3075424-2, -3, from the suspect blade lots are to be returned to Honeywell for inspection and rework. Reworked LPT2 rotor blades, PN 3075424-2, -3, will be reidentified with MFR-R or MRF-R on the underside of the LPT2 rotor blade aft discourager. (3) Action: Remove from service any LPT2 rotor blade, PN 3075424-2, -3, identified with a lot number listed in Table 5 that is not marked with MFR-R or MRF-R on the underside of the LPT2 rotor blade aft discourager and return to Honeywell for inspection and rework. D. Description (1) This service bulletin provides instructions to replace LPT2 rotor blades, PN 3075424-2, -3, identified with specific machining lots, which were manufactured with aft discouragers that did not meet the design requirements. E. Compliance (1) Compliance addresses a safety issue. (2) The warranty/program data is listed in Table 3. N OT E : The initial log book review to determine engine effectivity may be accomplished by the Operator. The procedures outlined in this service bulletin for the replacement of specific, identified LPT2 rotor blades, PN 3075424-2, -3, may be accomplished at the Major Service Center level or greater. Table 3. Warranty/Program Data Warranty/Program Yes No Commercial Warranty (Standard new engine warranty) X Spare Part Warranty (Standard new spare part warranty) X

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Table 3. Warranty/Program Data (Cont) Warranty/Program Yes No Special Extended Warranty Program Number (Extensio n of either standard commercial warranty or spare part warranty may apply) X Special Program Number 81 (Programs in which special pricing and/or special conditions may apply) X Special Pricing Notice Number (Reductio n from catalog list pricing, i.e., “P” condition pricing may apply) X

MSP X (3) Upon receipt of this service bulletin, review the engine log book (including the Life Limited Part Log Card for the installed LPT2 rotor assembly, PN 3060608-2, -3, -5), and this service bulletin to determine if the engine is affected, as indicated by any of the following conditions: (a) The engine is affected if the engine serial number is listed in Table 4 of this service bulletin. OR (b) The engine is affected if the LPT2 rotor assembly, PN 3060608-2, -3, -5, received maintenance between March 2009 and September 2010, which resulted in the replacement of any quantity of LPT2 rotor blade, PN 3075424-2. OR (c) The engine is affected if the LPT2 rotor assembly, PN 3060608-2, -3, -5, received maintenance between July 2010 and September 2010, which resulted in the replacement of any quantity of LPT2 rotor blade, PN 3075424-3. (4) If the engine serial number is not listed in Table 4 AND the LPT2 rotor assembly, PN 3060608-2, -3, -5, did not receive any maintenance that resulted in the replacement of any q uantity of LPT2 rotor blade, PN 3075424-2, between March 2009 and September 2010 AND the LPT2 rotor assembly, PN 3060608-2, -3, -5, did not receive any maintenance that resulted in the replacement of any quantity of LPT2 rotor blade, PN 30 75424-3, between July 2010 and September 2010, then make an entry in the engine log book and on the Life Limited Part Log Card for LPT2 rotor assembly, PN 3060608-2, -3, -5, indicating that Service Bulletin TFE731-72-5221 is not applicable. (5) If it is determined that the engine is affected by this service bulletin, determine the current total hours of operation of the installed suspect LPT2 rotor blades, PN 3075424-2, -3, (current total hours of suspect blade operation) as follows: (a) For engines having serial numbers listed in Table 4, the current total hours of suspect blade operation is the current engine total time since new (TSN). (b) For engines that received any maintenance that resulted in the replacement of any quantity of LPT2 rotor blade, PN 3075424-2, between March 2009 and September 2010 or any quantity of LPT2 rotor blade, PN 3075424-3, between July 2010 and September 2010, the current total hours of suspect

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blade operation is the number of hours the engine has operated since any suspect LPT2 rotor blade, PN 3075424-2, -3, was installed. (6) If it is determined that the engine is affected by this service bulletin, Honeywell recommends that the engine be disassembled for the removal of any suspect LPT2 rotor blade, PN 3075424-2, -3, at the next scheduled major periodic inspection (MPI) or at next access to the LPT2 rotor assembly, PN 3060608-2, -3, -5, not to exceed 3000 hours TSN on the LPT2 rotor blades, PN 3075424-2, -3, or seven (7) years from the initial release date of this service bulletin, whichever comes first. Next access is defined as when the LPT module is disassembled. N OT E : Removed LPT2 rotor blades, PN 3075424-2, -3, from the suspect LPT2 rotor blade lots are to be returned to Honeywell for inspection and rework. Reworked LPT2 rotor blades, PN 3075424-2, -3, will be reidentified with MFR-R or MRF-R on the underside of the LPT2 rotor blade aft discourager and may be reinstalled even though they are marked with a machining lot number listed on Table 5.

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Table 4. Engines With LPT2 Rotor Blades, PN 3075424-2, -3, From the Affected Machining Lots
Engine Model Number Engine Serial Number Engine Model Number Engine Serial Number Engine Model Number Engine Serial Number TFE731-20AR-1B P132191 TFE731-50R- 1H P122342 TFE731-50R- 1H P122362 TFE731-20AR-1B P132192 TFE731-50R-1H P122343 TFE731-50R-1H P122363 TFE731-20AR-1B P132193 TFE731-50R-1H P122344 TFE731-50R-1H P122364 TFE731-20AR-1B P132194 TFE731-50R-1H P122345 TFE731-50R-1H P122365 TFE731-50R-1H P122325 TFE731-50R-1H P122346 TFE731-50R-1H P122366 TFE731-50R-1H P122326 TFE731-50R-1H P122347 TFE731-50R-1H P122367 TFE731-5 0R-1H P122328 TFE731-5 0R-1H P122348 TFE731-5 0R-1H P122368 TFE731-50R-1H P122329 TFE731-50R-1H P122349 TFE731-50R-1H P122369 TFE731-50R-1H P122330 TFE731-50R-1H P122350 TFE731-50R-1H P122370 TFE731-50R-1H P122331 TFE731-50R-1H P122351 TFE731-50R-1H P122371 TFE731-50R-1H P122332 TFE731-50R-1H P122352 TFE731-50R-1H P122372 TFE731-50R-1H P122333 TFE731-50R-1H P122353 TFE731-50R-1H P122373 TFE73 1-50R-1H P1223 34 TFE73 1-50R-1H P1223 54 TFE73 1-50R-1H P1223 74 TFE731-50R-1H P122335 TFE731-50R-1H P122355 TFE731-50R-1H P122375 TFE731-50R-1H P122336 TFE731-50R-1H P122356 TFE731-50R-1H P122376 TFE731-50R-1H P122337 TFE731-50R-1H P122357 TFE731-50R-1H P122385 TFE731-50R-1H P122338 TFE731-50R-1H P122358 TFE731-50R-1H P122386 TFE731-50R-1H P122339 TFE731-50R-1H P122359 TFE731-50R-1H P122387 TFE 731-50R-1H P12 2340 TFE 731-50R-1H P12 2360 TFE 731-50R-1H P12 2388 TFE731-50R-1H P122341 TFE731-50R-1H P122361 Table 5. Affected Machining Lot Numbers of LPT2 Rotor Blades, PN 3075424-2, -3 LPT2 Rotor Blade PN Machining Lot Number 3075424-2 HM-0004 thru HM-0250 HM-9001 thru HM-9365 3075424-3 HM-0130 thru HM-0250 F. Approval (1) The inspection authorized by this service bulletin complies with applicable Federal Aviation Regulations and is FAA approved.

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G. Manpower (1) An estimated 11.5 man-hour(s) is/are required to accomplish this change when performed as part of scheduled maintenance. H. Weight and Balance (1) No change. 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 Table 6. Table 6. Sources of Information

Part/Model Number Heavy Maintenance Manual Light Maintenance Manual 1 Illustrated Parts Catalog 1 TFE731-20R-1B N/A 72-03-06 72-03-05 TFE731-20AR-1B N/A 72-03-06 72-03-05 TFE731-20BR-1B N/A 72-03-06 72-03-05 TFE731-40-1C N/A 72-03-06 72-03-09 TFE731-40AR-200G N/A 72-03-06 72-03-09 TFE731-40R-200G N/A 72-03-06 72-03-09 TFE731-50R-1H N/A 72-03-06 72-03-17 TFE731-60-1C N/A 72-03-06 72-03-13 NOTE: 1. Affected Chapter/Section/Subject 72-50-04. (2) The service bulletin(s) listed in Table 7 is/are applicable to this service bulletin. Table 7. Service Bulletin References Service Bulletin Number Service Bulletin Title TFE731-72-5179 ENGINE - TURBINE SECTION - Install Low Pressure Second Stage Turbine (LPT2) Blades, PN 3075424-3
L. Other Publications Affected (1) Same as those listed under Paragraph 1.K.(1). (2) Inspection/Repair Manual, 72-IR-02.

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M. Interchangeability or Intermixability of Parts (1) Not applicable.

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2. M ate ri a l I n fo rm at i o n A. Material - Price and Availability (1) Honeywell wil l cover the cost of the LPT2 rotor blade, PN 3075424-2, -3, reworks beyond the new engine warranty period at no cost to the operators up through the completion of the next MPI. Operators out of new engine warranty at the time of MPI may be respon sible for the replacement/repair of other engine hardware not associated with the LPT2 rotor blade, PN 3075424-2, -3, non-conformance addressed in this service bull etin. Refer to TFE731 Special Program Number 81 for additional details. (2) Information regarding price 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-Engin es website (www.e-engines.honeywell.com). Availability and pricing of parts may also be obtained from the Honeywell Product Catalog at http://portal.honeywell.com/wps/portal/aero. B. Industry Support Information (1) A special program is available for this modification, under certain conditions, provided 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 parts required to accomplish the instructions outlined in this service bulletin are shown in Ta ble 8. Refer to Table 9 for the Instructions/Disposition Codes. N OT E : Applicabl e illustrated parts catalogs and spare parts bulletins, dated later than the original issue date of this service bulletin, may introduce different parts for installation. Refer to these documents before ordering parts. N OT E : Expendable parts, discarded in gaining access to the affected area of the equip ment, are not included. Table 8. O perator-Purchased Material

New PN Keyword/ Nomenclature Old PN Qty Unit Price 1 Instruct ions/ Disposition Codes 3075424-2 2 or 3075424-3 3 LPT2 rotor blade 3075424-2 or 3075424-3 AR 4 T, O

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Table 8. Operator-Purchased Material (Cont)

New PN Keyword/ Nomenclature Old PN Qty Unit Price 1 Instructions/ Disposition Codes 3060655-6 5 LPT3 nozzl e assembly 3060655-6 1 E, R 3061829-1 Blade retainer 3061829-1 or 3060649-5 52 B

NOTES: 1. Refer to Paragraph 2.A. for information regarding price and availability of parts. 2. If LPT2 rotor blade, PN 3075424-2, is installed, after assembly the LPT2 rotor assembly, PN 3060608-2, -3, -5, must be returned to Honeywell Phoenix for high speed tip grinding. 3. If LPT2 rotor blade, PN 3075424-3, is used, no tip grinding is required. Refer to Service Bulletin TFE731-72-5179. 4. The quantity required depends on the number of LPT2 rotor blades, PN 3075424-2, -3, required to be replaced, up to a maximum quantity of 52. 5. Required only if LPT3 nozzle assembly, PN 3060655-6, is rejected. Table 9. Instructions/Disposition Codes Code Description Disposition Code B Dispose of old part according to company practices. Disposition Code E Reinstall removed part if serviceable; if not, replace. Disposition Code O Replacement part is available on exchange basis. Contact your service facility for details. Disposition Code R Send the old part to Honeywell International Inc., Material Receiving, 1944 E. Sky Harbor Circle, Phoenix, AZ 85034-3440 for evaluation. Disposition Code T If the removed LPT2 rotor blades, PN 3075424-2, -3, are marked with a machining lot number listed in Table 5, return the LPT2 rotor blades, PN 3075424-2, -3, regardless of condition. Otherwise, inspect and reuse if acceptable. Tag the rejected LPT2 rotor blades, PN 3075424-2, -3, as unserviceable and reference Service Bulletin TFE731-72-5221 and the total hours of the LPT2 rotor blades, PN 3075424-2, -3. Send the unserviceable LPT2 rotor blades, PN 3075424-2, -3, to Honeywell International Inc., Material Receiving, 1944 E. Sky Harbor Circle, Phoenix, AZ 85034-3440. Indicate on the shipping paperwork that the part is being returned in accordance with Service Bulletin TFE731-72-5221 and TFE731 Special Program Number 81. D. Material Necessary for Each Spare (1) The same as given in Paragraph 2.C. E. Reidentified Parts ( 1) N ot applicable. 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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3. Acco m p l i s h m e n t I n st ru ct i o n s A. General Information N OT E : 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. B. Replace LPT2 Rotor Blades, PN 3075424-2, -3, Identified With Suspect Lot Numbers (1) Review Paragraph 1.E. to make sure this service bulletin is applicable before disassembling the engine. (2) Disassemble the engine, as required, to get access to and remove the LPT2 rotor assembly, PN 3060608-2, -3, -5. Refer to the instructions in the engine light maintenance manual (LMM). (3) Remove all LPT2 rotor blades, PN 3075424-2, -3, from the LPT2 rotor assembly, PN 3060608-2, -3, -5, in accordance with the instructions in the engine LMM. For each removed LPT2 rotor blade, PN 3075424-2, -3, accomplish the following inspection: (a) Measure the axial length of each LPT2 rotor blade, PN 3075424-2, -3, as shown in Figure 1. The total axial length must not exceed 1.682 inches (42.72 mm).

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Figure 1. (Sheet 1 of 1) LPT2 Rotor Blades, PN 3075424-2, -3, Maximum Axial Length and Marking Locations

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KEY TO FIGURE 1 (SHEET 1 OF 1)

Reference Limits Inches (mm) DIM. A 1.682 (42.72) (b) Inspect each removed LPT2 rotor blade, PN 3075424-2, -3, to determine the machining lot number. Refer to Figure 1. (c) Notify Honeywell if any LPT2 rotor blade, PN 3075424-2, -3, fails the axial length check and is identified with a machining lot number that is NOT listed in Table 5. Also notify Honeywell if a removed LPT2 rotor blade, PN 3075424-2, -3, is identified with a machining lot number listed in Table 5, but passes the axial length check. (4) Reject any removed LPT2 rotor blade, PN 3075424-2, -3, that is identified with a machining lot number listed in Table 5, or any LPT2 rotor blade, PN 3075424-2, -3, that exceeds the maximum total axial length specified in Paragraph 3.B.(3)(a). (a) Return any rejected LPT2 rotor blade, PN 3075424-2, -3, to Honeywell for inspection and repair in accordance with Table 9. (b) Tag the rejected LPT2 rotor blades, PN 3075424-2, -3, as unserviceable, and reference Service Bulletin TFE731-72-5221 and the total hours of the LPT2 rotor blades, PN 3075424-2, -3. N OT E : Replacement LPT2 rotor blades, PN 3075424-2, -3, shipped after September 2010 may be identified with one of the suspect machining lot numbers listed in Table 5. These LPT2 rotor blades, PN 3075424-2, -3, were inspected and repaired by Honeywell and will be identified with MFR-R or MRF-R on the underside of the LPT2 rotor blade aft discourager, and may be installed. Make sure any replacement LPT2 rotor blade, PN 3075424-2, -3, identified with a lot number listed in Table 5, is also identified with the rework identifier MFR-R or MRF-R on the underside of the LPT2 rotor blade aft discourager before installation. Refer to Figure 1. (c) Any LPT2 rotor blade, PN 3075424-2, -3, that is not identified with a machining lot number listed in Table 5 AND passes the axial length check (refer to Paragraph 3.B.(3)(a)), may be reused provided all other maintenance manual inspection criteria are met. (5) Reassemble the LPT2 rotor assembly, PN 3060608-2, -3, -5, using serviceable LPT2 rotor blades, PN 3075424-2, -3, in accordance with the instructions in the engine LMM.

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Make sure all of the engine LMM requirements are met, including balance, tip grind (as necessary), and LPT2 rotor assembly, PN 3060608-2, -3, -5, tip diameter requirements. N OT E : If any new, unused LPT2 rotor blade, PN 3075424-2, is being installed, the LPT2 rotor assembly, PN 3060608-2, -3, -5, must be sent to Honeywell Phoenix for high speed tip grind. If previously used (previously tip ground) LPT2 rotor blade, PN 3075424-2, is received, it may be installed without tip grind provided all of the engine LMM requirements for LPT2 rotor assembly, PN 3060608-2, -3, -5, tip diameter are met. (6) Inspect the LPT3 nozzle assembly, PN 3060655-6, for evidence of rub on the forward surface of the seal support flange. Refer to Figure 2.

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Figure 2. (Sheet 1 of 1) Rub Inspection of LPT3 Nozzle Assembly, PN 3060655-6 (7) If the LPT3 nozzle assembly, PN 3060655-6, has no evidence of contact with the LPT2 rotor blades, PN 3075424-2, -3, the nozzle may be reused if all other maintenance manual inspection criteria are met. (8) If the LPT3 nozzle assembly, PN 3060655-6, shows only light, intermittent witness marks with no measurable depth into the nozzle parent material, and the nozzle meets all other maintenance manual inspection criteria, repair the nozzle as follows: (a) Lightly hand blend witness marks and any positive buildup to provide a surface finish of 63 microinches (0.0016 mm), or better.

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(b) Accomplish a pre-penetrant etch of the repaired areas in accordance with 72-IR-02, Appendix 2, REPAIR, Method Number 418. (c) Accomplish a Level 4 fluorescent penetrant inspection of the repaired area only. Refer to 72-IR-02, Appendix 1, INSPECTION, Method Number 302A. No indications are allowed. (9) If the LPT3 nozzle assembly, PN 3060655-6, has rub damage with any measurable depth into the nozzle parent material, reject the nozzle and return it to Honeywell for inspection and possible repair. Refer to Table 9. (10) Reassemble the engine. Refer to the instructions in the engine LMM. (11) Check and ensure proper engine operation in accordance with the aircraft flight manual and/or appropriate aircraft documents. (12) Upon completion of engine reassembly, check and ensure proper engine operation in accordance with the engine test instructions. (13) 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). (14) Complete the Certificate of Compliance form in Paragraph 4.A. and send to Honeywell.

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Blank Page

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4. A p pe n d ix 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 fax the completed certificate to: Honeywell International Inc. 111 S 34th Street, Mail Stop 503-320 Phoenix, AZ 85034-2802 Fax: (602) 231-3014 Owner/Operator

Aircraft Model Aircraft Serial Number I certify that the following engine/equipment has been modified in accordance with the listed service bulletins. Table 10. 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 BULLETIN NUMBER REV. NUMBER SERVICE BULLETIN NUMBER REV. NUMBER SERVICE BULLETIN NUMBER REV. NUMBER SERVICE BULLETIN NUMBER REV. NUMBER

Signature Date Repair Facility

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FAX TO U.S.A. (602) 231-3014

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