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CF34-10E Service Bulletins (SBs) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 Date Printed:
2022/11/15 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
Page 1 of 9 CF34-10E SERVICE BULLETIN - 72-0351 R01 Revised:07/17/2019 SB 72-0351 R01 ENGINE - CORE MODULE-MAJOR COMPONENTS (72-00-02) - INTRODUCTION OF NEW HPT SHROUD/LPT NOZZLE ASSEMBLY P/N 2205M38G07 Issued:
12/18/2018 GE Designated: -CONFIDENTIAL- The information contained in this document is GE proprietary information and is disclosed in confidence. 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 creation, manufacture, development, or derivation of any repairs, modifications, 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 part.
This technical data is considered subject to the Export Administration Regulations (EAR) pursuant to 15 CFR Parts 730-774. Transfer of this data by any means to a Non-U.S. 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 (2019) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION REVISION 1 TO SERVICE BULLETIN 72-0351 Revision 1 is issued to update paragraphs 1., , 2., PLANNING INFORMATION MATERIAL , and 3., .INFORMATION ACCOMPLISHMENT INSTRUCTIONS The original was issued December 18, 2018. Revision bars in the left margin identify changes.
1. PLANNING INFORMATION A. Effectivity * * * CF34-10E This Service Bulletin is applicable to these CF34-10E engines:
*CF34-10E engines, serial numbers 994111 through 994999 and 424101 through 424880.
This Service Bulletin has been introduced in production to these CF34-10E engines:
*CF34-10E engines, serial numbers 424881 and up.
These serial numbers are the best available data.
The high pressure turbine (HPT) shroud/low pressure turbine (LPT) nozzle assemblies P/N , P/N , P/N , P/N , and2205M38G01 2205M38G02 2205M38G03 2205M38G04 P/N are affected by this Service Bulletin.2205M38G05 B. Description This Service Bulletin introduces a new HPT shroud/LPT nozzle assembly P/N with welded retaining rings.2205M38G07 This Service Bulletin also provides instructions to rework the affected HPT shroud/LPT nozzle assemblies to P/N .2205M38G07 C. Compliance Category 2 GE recommends that you do this Service Bulletin as soon as possible without effect on revenue service at the next time the HPT shroud/LPT nozzle assembly is removed from the engine, but no later than the next HPT rotor cycle expiration as specified in GEK 112081, 05-11-03, AIRWORTHINESS LIMITATIONS - TIME LIMITS 001.
Impact A This recommendation is to address a condition that may affect Flight Safety.
CF34-10E Service Bulletins (SBs) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 Date Printed:
2022/11/15 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
Page 2 of 9 NOTE:This Service Bulletin can be accomplished in shop.
This Service Bulletin is offered to improve the reliability or performance of your GE product, or to help prevent the occurrence of the event or condition described in this Service Bulletin. If the operator elects not to participate in the bulletin, that decision will be taken into consideration by GE in evaluating future product performance issues that may arise in the operator's fleet.
D. Concurrent Requirements None.
E. Reason
(1) Objective:
To introduce a new part, rework parts, and reduce cost of ownership.
(2) Condition:
The current retaining ring becomes loose during operation, allowing the support air duct to migrate against the inner surface of the combustion case. This condition can impact the cooling flow to the LPT stage 1 nozzle, resulting in airfoil distress. It also can cause unserviceable wear to the combustion case.
(3) Cause:
The current retaining ring has been found to be not properly engaged in the mating retention groove.
(4) Improvement:
The addition of two welds to the interface of the retaining ring and wear bushing will add a positive retention of the support air duct.
(5) Substantiation:
Substantiation is by comparative analysis.
F. Approval The data contained in this Service Bulletin has been reviewed by the FAA or authorized entity representing the FAA and the repair(s) and modification(s) herein comply with the applicable Aviation Regulations and are APPROVED for installation in the model(s) listed in this Service Bulletin.
G. Manpower After you get access to the HPT shroud/LPT nozzle assembly, you will need approximately 4 man-hours for each engine or component.
H. Weight and Balance Weight and balance are not changed.
I. References (Use the latest version of these documents) GEK 9250, Commercial Engine Standard Practices Manual (SPM) GEK 112081, CF34-10E Engine Manual (EM) GEK 112082, CF34-10E Illustrated Parts Catalog (IPC) NOTE:The reference documents listed below are for the engine manufacturer's internal use only:
CID: 560165, 560165-1 J. Publications Affected GEK 112081, CF34-10E Engine Manual (EM) GEK 112082, CF34-10E Illustrated Parts Catalog (IPC) K. Interchangeability The HPT shroud/LPT nozzle assembly P/N and an inspected/repaired/new2205M38G07 combustion case must be replaced as a set and are one-way interchangeable (it is required to tack-weld all 84 retaining rings).
L. Software Accomplishment Summary Not applicable.
2. MATERIAL INFORMATION A. Material - Price and Availability
(1) Parts necessary to do this Service Bulletin:
None.
(2) Other Spare Parts:
None.
(3) Consumables:
Code Number Description C02-026 Oil, Penetrating C06-051 Wire, Weld, L-605 (AMS 5796) (filler material) B. Industry Support Information None.
C. Configuration Chart Chg/
CF34-10E Service Bulletins (SBs) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 Date Printed:
2022/11/15 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
Page 3 of 9 New Part Number Qty/ Eng Part Name Old Part Number/ IPC Location Qty/ Eng Op Code Sprt Code 2205M60G05/ G06/G07 (X) Engine Assembly, Base (SIN 00102) 2205M60G05/ G06/G07 (X) RM -/- . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G05 01-090D,72-00-02
(1) RE/RW 5/A (FIELD ONLY) 2205M30G01/ G02/G03 (X) Assembly, Core Module (SIN 00104) 2205M30G01/ G02/G03 (X) RM -/- . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G01 01-090,72-00-02
(1) RW 5/A . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G02 01-090A,72-00-02
(1) RW 5/A . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G03 01-090B,72-00-02
(1) RW 5/A . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G04 01-090C,72-00-02
(1) RW 5/A 2205M60G04 (X) Assembly, Core Module (SIN 00102) 2205M60G04 (X) RM -/- . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G03 01-090B,72-00-02
(1) RW 5/A 2205M60G06 (X) Assembly, Core Module (SIN 00102) 2205M60G06 (X) RM -/- . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G02 01-090E,72-00-02
(1) RW 5/A . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G03 01-090F,72-00-02
(1) RW 5/A 2205M60G04/ G05/G06 (X) Assembly, Core Module (SIN 00102) 2205M60G04/ G05/G06 (X) RM -/- . 2205M38G07 01-090G,72-00-02
(1) Assembly, HPT Shroud/LPT Nozzle (SIN 17300) . 2205M38G04 01-090C,72-00-02
(1) RW 5/A Operation Codes RE=Replace RM=Remains RW=Rework Change Codes 5=Qualified interchangeability. Refer to paragraph .1.K., Interchangeability Support Codes A=Old parts will no longer be supplied.
D. Parts Disposition Rework.
E. Tooling - Price and Availability None.
3. ACCOMPLISHMENT INSTRUCTIONS A. General
(1) The paragraphs that follow are for engines that go through shop visit and have the old HPT shroud/LPT nozzle assembly P/N , P/N , P/N , P/N ,2205M38G01 2205M38G02 2205M38G03 2205M38G04 or P/N .2205M38G05
(2) Do a visual inspection of the combustion case inner shell surface for evidence of damage caused by liberated support air ducts. Refer to Table 1 and Figure 1.
Table 1 Inspection Maximum Serviceable Limit Maximum Repairable Limit Repair Method
CF34-10E Service Bulletins (SBs) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 Date Printed:
2022/11/15 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
Page 4 of 9 Combustion case wear/gouges in area A caused by contact from liberated support air ducts.
Refer to Figure 1.
Any amount, 0.005 inch (0.13 mm) in maximum depth without high metal.
Any amount with high metal if the remaining wall thickness after blending is no less than 0.0200 inch
(0.508 mm).
Remove the high metal and wear/gouges with a minimum blend radius of 0.250 inch (6.35 mm). Refer to GEK 9250, 70-42-00,
BLENDING AND REMOVAL
OF HIGH METAL PROCEDURES.
B. Rework
(1) Make sure that the 84 retaining rings (4, are installed as specified in GEKFigure 2) 112081, 72-53-00, ASSEMBLY 001, Subtask 72-53-00-440-016.
(2) Weld the retaining ring (4, to the wear bushing (1) as follows:Figure 2)
(a) Find each of the 84 retaining rings (4).
(b) Weld the retaining ring (4) onto the wear bushing (1). Refer to GEK 9250, 70-41-00, WELDING AND BRAZING PRACTICES and do as follows:
1 Use the tungsten inert-gas (TIG) welding method with filler material (C06-051).
Refer to GEK 9250, 70-80-06, WELD AND BRAZE MATERIALS.
2 Make two equally spaced welds of 0.060 inch (1.52 mm) in minimum length. If the retaining ring (4, melts or cracks, increase the two tack-weld lengthsFigure 2) to 0.210 inch (5.33 mm) in minimum length.
NOTE:Welding amperage can be adjusted as low as 4 amps to prevent melts.
(c) Do a visual inspection of each weld for cracking with a 5X minimum magnification glass and bright light. No cracking permitted. If you find cracks, it is permitted to weld again to fill the crack.
(d) Do step 3.B.(2) for the 84 retaining rings (4, on the HPT shroud/LPT nozzleFigure 2) assembly.
NOTE:Part number re-identification is not necessary.
C. Disassembly of Welded Retaining Rings Post-CF34-10E S/B 72-0351
(1) Make sure that the HPT shroud/LPT nozzle assembly is disassembled as specified in GEK 112081, 72-53-00, DISASSEMBLY 001, Subtask 72-53-00-040-001 through Subtask 72-53-00-040-005.
(2) Remove the LPT nozzle assembly from the LPT shroud/nozzle support (5, asFigure 2) follows:
CAUTION:DO NOT SCRATCH OR GROOVE THE INNER WALL OF THE LPT SHROUD/NOZZLE SUPPORT WEAR BUSHING
(1) WHEN YOU REMOVE THE RETAINING RINGS (4).
(a) Use a drill and ball burr to remove all retaining ring tack welds and all the retaining rings (4) from the wear bushings (1).
(b) Discard the remaining retaining ring (4) material from the wear bushing (1). Use a 90-degree machinist hook scribe.
WARNING:REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND PROPER USE OF THIS PRODUCT.
(c) Apply penetrating oil (C02-026) to the support air ducts (2).
(3) Continue with the disassembly procedure as specified in GEK 112081, 72-53-00, DISASSEMBLY 001, Subtask 72-53-00-040-007 through Subtask 72-53-00-040-011.
CF34-10E Service Bulletins (SBS) SB 72-0351 RO1 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07
COMBUSTION CASE
COMBUSTION CASE SURF. C (AFT FLANGE) OUTLET
GUIDE VANE B-B 5061754-00 Combustion Case Inspection Figure 1 (Sheet 1) PROPRIETARY INFORMATION - Not to be used, disclosed to others or Date Printed: reproduced without the express written consent of GE. Technical data Page 2022/11/15 considered ITAR and/or EAR controlled; transfer of this data to a Non-US 5 of 9 Person, without USG authorization, is strictly prohibited.
CF34-10E Service Bulletins (SBs) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 Date Printed:
2022/11/15 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.
Page 6 of 9 Combustion Case Inspection Figure 1 (Sheet 2)
CF34-10E Service Bulletins (SBS) SB 72-0351 RO1 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 SURF. C AREA A 270° 180% 180°
0.600
(15.24) 1.00 SURF. C
(25.4)
1.400
(35.56) (BLEND AREAS DUE TO CONTACT WITH
LIBERATED SUPPORT AIR DUCT) NOTE:
DIMENSIONS ARE IN INCHES WITH MILLIMETERS IN PARENTHESES.
5061764-00 Combustion Case Inspection Figure 1 (Sheet 3) PROPRIETARY INFORMATION - Not to be used, disclosed to others or Date Printed: reproduced without the express written consent of GE. Technical data Page 2022/11/15 considered ITAR and/or EAR controlled; transfer of this data to a Non-US 7 of 9 Person, without USG authorization, is strictly prohibited.
CF34-10E Service Bulletins (SBS) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 A-A 5060234-00 Retaining Ring Weld Location Figure 2 (Sheet 1) GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or Date Printed: reproduced without the express written consent of GE. Technical data Page 2022/11/15 considered ITAR and/or EAR controlled; transfer of this data to a Non-US 8 of 9 Person, without USG authorization, is strictly prohibited.
CF34-10E Service Bulletins (SBS) SB 72-0351 R01 ENGINE - Core Module-Major Components (72-00-02) - Introduction of New HPT Shroud/LPT Nozzle Assembly P/N 2205M38G07 _ 2 FWD B
0.060 MIN LENGTH
(1.52)
TWO EQUALLY SPACED WELDS 1 (REF) LEGEND:
1. WEAR BUSHING (QTY-84) (01-025, 72-53-00)
2. SUPPORT AIR DÚCT (QTY-84) (05-080, 72-53-00)
3. LPT STAGE 1 NOZZLE (QTY-21) (05-050 AND 05-060, 72-53-00)
4. RETAINING RING (QTY-84) (05-070, 72-53-00)
5. LPT SHROUD/NOZZLE SUPPORT 4 (REF) (01-010, 72-53-00) NOTE:
DIMENSIONS ARE IN INCHES WITH MILLIMETERS IN PARENTHESES. 5061797-01 Retaining Ring Weld Location Figure 2 (Sheet 2) GE Designated: - CONFIDENTIAL Subject to the restrictions on the media GE PROPRIETARY INFORMATION - Not to be used, disclosed to others Date Printed: reproduced without the express written consent of GE. Technical data Page 2022/11/15 considered ITAR and/or EAR controlled; transfer of this data to a Non-US 9 of 9 [Person, without USG authorization, is strictly prohibited.