# General Electric Service Bulletin 72-0749: No revision named - Rights: © General Electric Company. Filed by the FAA in regulations.gov docket FAA-2017-0668, the docket of AD 2018-07-05. Not covered by OpenAirDocs’ CC0 dedication. - Document: [General Electric Service Bulletin 72-0749](https://openairdocs.org/service-documents/ge/sb-72-0749.md) - Title as filed: CF6-80A SB 72-0749 R02 - Pages: 9 - PDF: https://openairdocs.org/files/sha256/8b/e6/8be662f1b23291a99e4d9dfb13eee93ea650374167edc146731497f4cea94b27 - Page: https://openairdocs.org/service-documents/ge/sb-72-0749/file/8be662f1b232 ## Text 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 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement GE PROPRIETARY INFORMATION The information contained in this document is GE proprietary information and is disclosed in con- fidence. It is the property of GE and shall not be used, disclosed to others or reproduced without the express written consent of GE, including, but without limitation, it is not to be used in the cre- ation, manufacture, development, or derivation of any repairs, modi fications, spare parts, designs, or configuration changes or to obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in whole or in part, this notice and the notice set forth on each page of this document shall appear in any such reproduction in whole or in part. This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively. Transfer of this data by any means to a Non-US Person, whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly prohibited. Copyright (2016) General Electric Company, U.S.A. May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 1 of 9 ### Page 2 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement TRANSMITTAL INFORMATION REVISION 2 TO SERVICE BULLETIN 72-0749 Revision 2 is issued to update paragraphs 1.D., C ompliance, 1.I., R eferences,a n d2 . A . ,Material - Price and Availability. Revision 1 was issued June 10, 2014. The original was issued May 16, 2000. Revision bars in the left margin identify changes. 1. PLANNING INFORMATION A. Effectivity CF6-80A/A1/A2/A3 Low pressure turbine (LPT) stage 3 nozzles 9290M52P05, 9290M52P06 and stage 4 nozzles 9290M53P05, 9290M53P06 are affected by this Service Bulletin. B. Concurrent Requirements None. C. Description This Service Bulletin recommends replacement of stage 3 nozzles 9290M52P05, 9290M52P06 with 9290M52P07, 9290M52P08, 9290M52P09, 9290M52P10 and stage 4 nozzles 9290M53P05, 9290M53P06 with 9290M53P07, 9290M53P08, 9290M53P09, 9290M53P10. Stage 3 nozzles 9290M52P07, 9290M52P08, 9290M52P09 and stage 4 nozzles 9290M53P07, 9290M53P08, 9290M53P09 were identi fied in Spare Parts Release Service Bulletins as indicated in A PPENDIX A. Stage 3 nozzle 9290M52P10 and stage 4 nozzles 9290M53P10 are introduced in this Service Bulletin. D. Compliance For stage 3 nozzles: Category 2 GE recommends that you do stage 3 nozzles P/N 9290M52P05, P/N 9290M52P06 replacement as soon as possible without effect on revenue service but before 36 months from Service Bulletin revision effective date. Impact B This recommendation is to address a condition that may result in an increased rate of In-Flight Shutdowns (IFSD), T akeoff Aborts (TOA), Air Turn Backs (ATB), or Diversions (DIV). May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 2 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 3 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement For stage 4 nozzles: Category 5 GE recommends you do as soon as the stage 4 nozzles P/N 9290M53P05, P/N 9290M53P06 are removed from the engine. Impact E This recommendation is to improve the cost of ownership, reduce maintenance requirements, or is a product improvement. E. Reason (1) Objective: REDUCE SIGNIFICANT EVENTS - UNCONTAINED FAILURES Improve the reliability of the LPT . (2) Condition: Stage 3 nozzles 9290M52P05/P06 and stage 4 nozzles 9290M53P05/P06 have cracked ( figure 1). (3) Cause: Cracks are high cycle fatigue caused by high stress. (4) Improvement / Inspection: The previously introduced stage 3 nozzles 9290M52P07/P08 and stage 4 nozzles 9290M53P07/P08 provide improved geometry that reduces stress fatigue. The previously introduced stage 3 nozzles 9290M52P09 and stage 4 nozzles 9290M53P09 have the improved geometry but also have CODEP and chromide coatings to increase corrosion resistance. The new 9290M52P10 and 9290M53P10 also have improved geometry, and CODEP and chromide coatings. (5) Substantiation: The impact of the new coatings on fatigue life was tested. No reduction in fatigue life was indicated. F. Approval This Service Bulletin has been reviewed by the FAA and the repair(s) and modification(s) herein comply with the applicable Federal Aviation Regulations and are FAA APPROVED for installation in the model(s) listed in this Service Bulletin. May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 3 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 4 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement G. Manpower No additional man-hours are necessary to do this Service Bulletin. H. Weight and Balance The change in this Service Bulletin increases weight by 0.1 lbs (0.05 kg) at approximate Engine Station 290 inches (7366 mm). I. References (Use the latest version of these documents) CF6-80A Engine Manual, GEK 72501 V.4001 (A/A2) CF6-80A Engine Manual, GEK 72501 V.4010 (A1/A3) CF6-80A Illustrated Parts Catalog (IPC), GEK 72507 (A/A2) CF6-80A Illustrated Parts Catalog (IPC), GEK 72507-1 (A1/A3) CF6-80A S/B 72-0455, ENGINE - Spare Parts Release For CF6-80A Engines CF6-80A S/B 72-0723, ENGINE - Spare Parts Release For CF6-80A Engines CF6-80A S/B 72-0746, ENGINE - Spare Parts Release For CF6-80A Engines CF6-80A S/B 72-0809, ENGINE - Stage 4 LPT Nozzles (72-56-00) and Stages 1, 2, and 3 LPTR Blades (72-57-00) - New/Rewor k for Improved Engine Reliability CF6-80A S/B 72-0814, ENGINE - Low Pressure Turbine Module (72-00-04) - New Stages 1, 2, and 3 LPT Shrouds NOTE: The reference documents listed below are for the engine manufacturer's internal use only: CID: 848211 BPP:16-72-56-56833 J. Publications Affected CF6-80A Illustrated Parts Catalog (IPC), GEK 72507 (A/A2) CF6-80A Illustrated Parts Catalog (IPC), GEK 72507-1 (A1/A3) K. Interchangeability Replace the stage 3 nozzles P/Ns 9290M52P05 and 9290M52P06 with the stage 3 nozzles P/Ns 9290M52P07, 9290M52P08, 9290M52P09, and 9290M52P10, and the stage 4 nozzles P/Ns 9290M53P05 and 9290M53P06 with the stage 4 nozzles P/Ns 9290M53P07, 9290M53P08, 9290M53P09, and 9290M53P10. Do not replace the stage 3 nozzles P/Ns 9290M52P07, 9290M52P08, 9290M52P09, and 9290M52P10 with the stage 3 nozzles P/Ns 9290M52P05 and 9290M52P06, May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 4 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 5 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement and the stage 4 nozzles P/Ns 9290M53P07, 9290M53P08, 9290M53P09, and 9290M53P10 with the stage 4 nozzles P/Ns 9290M53P05 and 9290M53P06. 2. MATERIAL INFORMATION A. Material - Price and Availability (1) Parts necessary to do this Service Bulletin: Part Number Qty/ Eng Part Name Unit ($) Price Pkg Qty Lead Time Days 9290M52P07* (23) Nozzle - Stage 3 NP (-) -- 9290M52P08* (1) Nozzle - Stage 3 NP (-) -- 9290M52P09 (23) Nozzle - Stage 3 15,380 (1) 5 9290M52P10 (1) Nozzle - Stage 3 14,520 (1) Quote 9290M53P07* (23) Nozzle - Stage 4 NP (-) -- 9290M53P08* (1) Nozzle - Stage 4 NP (-) -- 9290M53P09** (23) Nozzle - Stage 4 NP (-) -- 9290M53P10** (1) Nozzle - Stage 4 NP (-) -- NP = Not Provisioned. *Superseded part, no longer available. For the latest con figuration, refer to paragraph 2.C., C onfiguration Chart of this Service Bulletin. **Superseded part, no longer available. For the latest con figuration, refer to CF6-80A S/B 72-0809-R01, paragraph 2.C., C onfiguration Chart. (2) Other Spare Parts: None. (3) Consumables: None. May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 5 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 6 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement B. Industry Support Information None. C. Configuration Chart New Part Number Qty/ Eng Part Name Old Part Number/ IPC Location Qty/ Eng Op Code Chg/ Sprt Code 9213M59G01 (X) Rotor/Stator Assembly 9213M59G01 (X) RM -/- .9290M52P07 (23) Nozzle, Stage 3 .9290M52P05 72-56-00-1-170 72-56-00-1A-170 (23) SU 1/B OR .9290M52P09 (23) Nozzle, Stage 3 .9290M52P05 72-56-00-1-170 72-56-00-1A-170 (23) SU 1/B .9290M52P09 (23) Nozzle, Stage 3 .9290M52P07 72-56-00-1-170 72-56-00-1A-170 (23) RE 2/B .9290M52P08 (1) Nozzle, Stage 3 .9290M52P06 72-56-00-1-190 72-56-00-1A-190 (1) SU 1/B OR .9290M52P10 (1) Nozzle,Stage 3 .9290M52P06 72-56-00-1-190 72-56-00-1A-190 (1) SU 1/B .9290M52P10 (1) Nozzle, Stage 3 .9290M52P08 72-56-00-1-190 72-56-00-1A-190 (1) RE 2/B .9290M53P07 (23) Nozzle, Stage 4 .9290M53P05 72-56-00-1-100 72-56-00-1A-100 (23) SU 1/B OR .9290M53P09 (23) Nozzle, Stage 4 .9290M53P05 72-56-00-1-100 72-56-00-1A-100 (23) SU 1/B .9290M53P09 (23) Nozzle, Stage 4 .9290M53P07 72-56-00-1-100 72-56-00-1A-100 (23) RE 2/B .9290M53P08 (1) Nozzle, Stage 4 .9290M53P06 72-56-00-1-120 72-56-00-1A-120 (1) SU 1/B May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 6 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 7 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement New Part Number Qty/ Eng Part Name Old Part Number/ IPC Location Qty/ Eng Op Code Chg/ Sprt Code OR .9290M53P10 (1) Nozzle, Stage 4 .9290M53P06 72-56-00-1-120 72-56-00-1A-120 (1) SU 1/B .9290M53P10 (1) Nozzle, Stage 4 .9290M53P08 72-56-00-1-120 72-56-00-1A-120 (1) RE 2/B *Parts were previously released as indicated in A PPENDIX A. The P/Ns 9290M52P07, 9290M52P08, 9290M52P09, and 9290M52P10 parts are acceptable, but P/Ns 9290M52P09, 9290M52P10, 9290M53P09, and 9290M53P10 nozzles have the added bene fit of a corrosion protection coating. Operation Codes RE = Replace RM = Remains SU = Superseded Change Codes 1 = One-way interchangeable. 2 = Two-way interchangeable. Support Codes B = Old parts will be supplied until all old parts are sold. D. Parts Disposition Discard stage 3 nozzles P/Ns 9290M52P05, 9290M52P06 and stage 4 nozzles P/Ns 9290M53P05 and 9290M53P06. E. Tooling - Price and Availability None. 3. ACCOMPLISHMENT INSTRUCTIONS A. General Assembly and disassembly of the old and new stage 3 and stage 4 nozzles are not changed. Refer to the CF6-80A EM, 72-56-00, LOW PRESSURE TURBINE STATOR ASSEMBLY 5-570, 5A-210, or 8-140, 72-00-04 - ASSEMBLY and LOW PRESSURE TURBINE STATOR ASSEMBLY 5-570, 5A-210, and 8-140, 72-00-04 - DISASSEMBLY . May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 7 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 8 (OCR) CF6-80A GE Aircraft Engines SERVICE BULLETIN ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement A AIRFOIL LEADING EDGE - AIRFOIL LEADING EDGE LEADING EDGE CRACKING AIRFOIL SEDGE LEADING B AIRFOIL _LEADING EDGE LEADING EDGE CRACKING AIRFOIL/PLATFORM CRACKING 1181307-00 LPT Stage 3 and Stage 4 Cracking Figure 1 May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 8 GE PROPRIETARY INFORMATION - Subject to the restrictions on the cover or first page. ### Page 9 ENGINE - LPT (72-56-00) - Stage 3 and 4 Nozzles - Replacement 4. APPENDIX A - LPT STAGE 3 AND STAGE 4 NOZZLE PARTS PROGRESSION CHART Part Number Part Name Identified By Service Bulletin No. Improvements 9290M52P05 LPT Stage 3 Nozzle Baseline -- 9290M52P06 LPT Stage 3 Nozzle Baseline -- 9290M52P07 LPT Stage 3 Nozzle S/B 72-0455 Shape 9290M52P08 LPT Stage 3 Nozzle S/B 72-0455 Shape 9290M52P09 LPT Stage 3 Nozzle S/B 72-0746 Coatings 9290M52P10 LPT Stage 3 Nozzle S/B 72-0749 Coatings 9290M53P05 LPT Stage 4 Nozzle Baseline -- 9290M53P06 LPT Stage 4 Nozzle Baseline -- 9290M53P07 LPT Stage 4 Nozzle S/B 72-0455 Shape 9290M53P08 LPT Stage 4 Nozzle S/B 72-0455 Shape 9290M53P09 LPT Stage 4 Nozzle S/B 72-0723 Coatings 9290M53P10 LPT Stage 4 Nozzle S/B 72-0749 Coatings May 16, 2000 CF6-80A S/B 72-0749 Revision 02, August 31, 2016 PAGE 9 GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.