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ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection GE Designated: -CONFIDENTIAL- The information contained in this document is GE proprietary information and is disclosed in con¿dence. 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, modi¿cations, spare parts, designs, or con¿guration 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 (2024) General Electric Company, U.S.A.
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 1 of 12
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection
1. PLANNING INFORMATION A. Effectivity CT7-2E1 This Alert Service Bulletin is applicable to CT7-2E1 engine models with power turbine (PT) drive shaft assembly part number (P/N) 5125T92G01 installed with less than 100 hours-time since new (TSN) or 100 hours-time since replacement (TSR) of the PT drive shaft assembly produced or made between 2020 and 2023.
The affected engine serial numbers (ESN) and PT drive shaft assembly serial numbers (S/N) listed in this Alert Service Bulletin is the best available data.
See Appendix A, T able 1 for a list of applicable ESNs and PT drive shaft assembly S/Ns.
B. Description This Alert Service Bulletin provides instructions to remove the engine C-sump cover and use an Ultrasonic T est (UT) Phase Array probe to inspect the PT drive shaft assembly reference tube magnetic insert end braze joint.
C. Compliance Category 1 GE recommends that you do this Alert Service Bulletin before subsequent Àight.
Non-passenger operation is allowed for repositioning the aircraft to a maintenance facility if required.
Impact A This recommendation is to address a condition that may affect Àight safety.
NOTE: This Alert Service Bulletin can be done on wing or in shop.
D. Concurrent Requirements None.
E. Reason
(1) Objective:
This Alert Service Bulletin provides an inspection to verify the minimum acceptable braze coverage on the PT drive shaft assembly reference tube magnetic insert.
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 2 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection
(2) Condition:
Multiple PT drive shaft assemblies were shipped with inadequate braze coverage on the end of the PT shaft reference tube magnetic insert joint.
(3) Cause:
Inadequate braze coverage within the torque reference tube magnetic insert joint can become compromised leading to improper torque and speed indications.
(4) Improvement:
Planning has been updated and UT Phase Array probe inspection has been incorporated into the manufacturing process of the torque reference tube assembly.
(5) Substantiation:
Substantiation is by analysis and ¿eld experience.
F. Approval The data contained in this Alert Service Bulletin has been reviewed by the FAA or authorized entity representing the FAA and the repair(s) and modi ¿cation(s) herein comply with the applicable Aviation Regulations and are APPROVED for installation in the model(s) listed in this Alert Service Bulletin.
G. Manpower You will need approximately one man-hour to do this Alert Service Bulletin once the area is exposed.
H. Weight and Balance Weight and balance are not changed.
I. References (Use the latest version of these documents) CT7-2E1 Turboshaft Engine Service Record FST-2572, Phase Array Ultrasonic Inspection Procedure GEK 112043-02, CT7-2E Maintenance Manual (MM) GEK 112044-02, CT7-2E Shop Manual (SM) GEK 115715, CT7-E1 Illustrated Parts Catalog (IPC) J. Publications Affected None.
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 3 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection K. Interchangeability Not applicable.
L. Software Accomplishment Summary Not applicable.
2. MATERIAL INFORMATION A. Material - Price and Availability
(1) Parts necessary to do this Alert Service Bulletin:
Part Number Qty/ Eng Part Name Unit ($) Price Pkg Qty Lead Time Days 4074T58P04 72-50-00-01-060A
(1) Packing, Preformed (SIN 91652) Quote (-) Quote J1400P011 72-50-00-01-060B (Alt) Packing, Preformed (SIN 91652) Quote (-) Quote 4074T58P09 72-50-00-01-070A
(1) Packing, Preformed (SIN 91650) Quote (-) Quote J1400P159 72-50-00-01-070B (Alt) Packing, Preformed SIN 91650 Quote (-) Quote
(2) Other Spare Parts:
None.
(3) Consumables:
Code Number Description C02-007 Assembly Fluid, Ultrachem No. 1 -- Oil, Engine B. Industry Support Information Not applicable.
C. Con¿guration Chart Not applicable.
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 4 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection D. Parts Disposition See paragraph 3., A CCOMPLISHMENT INSTRUCTIONS.
E. Tooling - Price and Availability Part Number Nomenclature GE-FQAP-803 Ultrasonic Probe T est Kit (Provided by GE Aerospace)
3. ACCOMPLISHMENT INSTRUCTIONS A. General NOTE 1: This task can be performed on-wing with the exhaust center body frame and C-sump housing removed.
NOTE 2: T o accomplish this inspection there must be access to the engine C-sump heat shield to allow removal of the heat shield and the C-sump cover to insert the Phase Array Probe (approximately 12.5 inches (318 mm)). The inspection also requires power for an ultrasonic instrument (approximately 12 inches x 12 inches x 6 inches (305 mm x 305 mm x 152 mm)) which must be visually observed by the inspector during the test and must be in close proximity to the probe. This may require removal of the engine from the aircraft in some installations. This inspection may also be carried out on an engine stand or in an engine storage container with the lid removed.
NOTE 3: Review the engine log book for the installation time of the installed PT drive shaft assembly P/N 5125T92G01. If the current operational time on the part since installation is over 100 hours, compliance with this Alert Service Bulletin is satis ¿ed. Go to paragraph 3.B.(3) and record compliance with this Alert Service Bulletin. If the PT drive shaft assembly is less than 100 hours, proceed with the remainder of this Alert Service Bulletin.
NOTE 4: This procedure gives instructions to remove the C-sump heat shield (01-020, Figure 1) and C-sump cover (01-040) to inspect the magnetic insert braze joint on the PT drive shaft assembly (01-070, Figure 2 and Figure 3).
(1) Remove the C-sump heat shield (01-020, Figure 1) and C-sump cover (01-040). Refer to CT7-2E MM GEK 112043-02, 72-50-00, REMOVAL AND INSTALLATION, TASK 72-50-00-400-801, paragraph 4.A..
NOTE: The UT Phase Array Probe inspection must be performed by a level 2 or 3 NDT ultrasonic inspector who has been trained by GE Aerospace.
(2) Following the GE proprietary inspection procedure FST-2572 - Phase Array Ultrasonic Inspection Procedure for the torque reference tube, perform the braze inspection to quantify the percentage of braze.
(a) If the percentage of braze is greater than or equal to 42%, the engine may be returned to service.
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 5 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection
(b) If the percentage of braze is less than 42%, tag the engine as failed PT shaft UT inspection and return the engine or PT module to an MRO shop for repair or replacement of the PT drive shaft assembly.
(3) Once the inspection is completed, re-install the C-sump cover (01-040, Figure
1) and C-sump heat shield (01-020). Refer to CT7-2E MM GEK 112043-02, 72-50-00, REMOVAL AND INSTALLATION, TASK 72-50-00-400-801, paragraph 4.B.(3)
(4) For installed engines that have passed inspection, perform required checks. Refer to CT7-2E MM GEK 112043-02, 72-00-00, TEST , TASK 72-00-00-760-803, paragraph 4 (Checkout Procedure After Replacement of Parts), paragraph 6.D. (Idle Speed Leakage Check), and paragraph 7.B. (Oil Consumption Check).
(5) For spare engines at the operator that have passed inspection, perform the following:
(a) Go to paragraph 3.B., C ompliance as the inspection will meet the intent of this Alert Service Bulletin. When the engine is installed in an aircraft, perform the required checks. Refer to CT7-2E MM GEK 112043-02, 72-00-00, TEST , TASK 72-00-00-760-803, paragraph
6.C. (Functional T est Procedures for Newly Installed Engines and Component Replacement (includes Idle Speed Leakage Check)) and paragraph 7.B. (Oil Consumption Check).
(6) For engines and modules at an MRO facility that have passed inspection, perform the following:
(a) T est engines per CT7-2E SM GEK 112044-02, 72-00-00, TESTING 006, TASK 72-00-00-760-809 (Idle Speed Check) and 72-00-00, TESTING 011, TASK 72-00-00-760-814 (Oil Consumption Check).
(b) T est modules per CT7-2E SM GEK 112044-02, 72-00-00, TESTING 004, TASK 72-00-00-760-834 (EngineT est Requirements) (Engine Start, Idle Speed Leakage, Transient, and Engine Shutdown Checks).
B. Compliance
(1) Record information in T able A.
(2) Provide copies of T able A and the GE UT inspection report to the GE Field Service Representative and the Customer Representative.
(3) Record compliance of this Alert Service Bulletin in the appropriate CT7 Turboshaft Engine Service Record.
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 6 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection
TABLE A - POWER TURBINE DRIVE SHAFT ASSEMBLY INSPECTION RESULTS Engine or PT Module S/N (if applicable) PT Drive Shaft Assembly P/N PT Drive Shaft Assembly S/N PT Shaft Time Since New (Hours) PT Shaft Time Since Repair (Hours) %B r a z e Coverage Date Work Performed by (Print Name): Signature: Date:
February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 7 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
GE Aviation CT7-2E1
ALERT SERVICE BULLETIN ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection C-SUMP
HOUSING
EXHAUST FRAME
OIL NOZZLE (TYPICAL) NO. 5 CARBON SEAL 00000
OIL NOZZLE (TYPICAL)
PREFORMED
PACKING (01-070) NO. 6
BEARING
- 00-0 C-SUMP
COVER G-SUMP (01-040) HEAT SHIELD NO. 5 (01-020) BEARING NO. 5 AND NO. 6
BEARING SUPPORT NOTE:
ALL IPC REFERENCES ARE FROM 72-50-00 UNLESS SPECIFIED DIFFERENTLY. 6045825-00 C-Sump Heat Shield and C-Sump Cover - Removal and Installation Figure 1 February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 8 GE Designated: - CONFIDENTIAL Subject to the restrictions on the media
GE Aviation CT7-2E1
ALERT SERVICE BULLETIN ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection
REFERENCE TABS
AFT END OF
POWER TURBINE SHAFT 6045651-00 C-Sump and Aft End of Power Turbine Shafte Figure 2 February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 9 GE Designated: - CONFIDENTIAL Subject to the restrictions on the media
GE Aviation CT7-2E1
ALERT SERVICE BULLETIN ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection TORQUE
SENSOR TUBE (01-120)
REAR INSERT (01-110) POWER
TURBINE SHAFT (01-080)
PREFORMED
PACKING FRONT INSERT PIN (01-060) (01-100) LOCKNUT (01-090) (01-040) PIN (01-090) POWER TURBINE
DRIVE SHAFT ASSY (01-070) NOTE:
ALL IPC REFERENCES ARE FROM 72-52-00 UNLESS SPECIFIED DIFFERENTLY. 6045824-00 Power Turbine Drive Shaft Assembly Figure 3 February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 10 GE Designated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection
4. APPENDIX A TABLE 1 - LIST OF APPLICABLE CT7-2E1 ENGINE AND COMPONENT SERIAL NUMBERS Component Nomenclature Part Number Engine Serial Number Component Serial Number Power Turbine Drive Shaft Assy 5125T92G01 780111 UNK Power Turbine Drive Shaft Assy 5125T92G01 780132 UNK Power Turbine Drive Shaft Assy 5125T92G01 780298 GATJA6W8 Power Turbine Drive Shaft Assy 5125T92G01 780307 GATJA0R4 Power Turbine Drive Shaft Assy 5125T92G01 780309 GATJA9LL Power Turbine Drive Shaft Assy 5125T92G01 780310 GATJADNN Power Turbine Drive Shaft Assy 5125T92G01 780311 GATJAE32 Power Turbine Drive Shaft Assy 5125T92G01 780312 GATJAF9W Power Turbine Drive Shaft Assy 5125T92G01 780326 GATJAN5F Power Turbine Drive Shaft Assy 5125T92G01 780338 GATJA9LH Power Turbine Drive Shaft Assy 5125T92G01 780339 GATJC0M1 Power Turbine Drive Shaft Assy 5125T92G01 780342 GATJAPFA Power Turbine Drive Shaft Assy 5125T92G01 780343 GATJC0T3 Power Turbine Drive Shaft Assy 5125T92G01 780344 GATJC22C Power Turbine Drive Shaft Assy 5125T92G01 780345 GATJAWRD Power Turbine Drive Shaft Assy 5125T92G01 780347 GATJC0TA Power Turbine Drive Shaft Assy 5125T92G01 780349 GATJAT02 Power Turbine Drive Shaft Assy 5125T92G01 780350 GATJC4LW Power Turbine Drive Shaft Assy 5125T92G01 780351 GATJC52M Power Turbine Drive Shaft Assy 5125T92G01 780352 GATJC3E3 Power Turbine Drive Shaft Assy 5125T92G01 780353 GATJC5A7 Power Turbine Drive Shaft Assy 5125T92G01 780354 GATJC5W9 Power Turbine Drive Shaft Assy 5125T92G01 780355 GATJC69A Power Turbine Drive Shaft Assy 5125T92G01 780356 GATJC6JF Power Turbine Drive Shaft Assy 5125T92G01 780357 GATJC68W Power Turbine Drive Shaft Assy 5125T92G01 780358 GATJC6FA Power Turbine Drive Shaft Assy 5125T92G01 780359 GATJC6HM February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 11 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media
ENGINE - Power Turbine Module (72-50-00) - Power Turbine Shaft/Torque Reference Tube Magnetic Insert Braze Inspection Component Nomenclature Part Number Engine Serial Number Component Serial Number Power Turbine Drive Shaft Assy 5125T92G01 780361 GATJC89G Power Turbine Drive Shaft Assy 5125T92G01 780362 GATJC9A6 Power Turbine Drive Shaft Assy 5125T92G01 780363 GATJC9A3 Power Turbine Drive Shaft Assy 5125T92G01 780364 GATJC7WC Power Turbine Drive Shaft Assy 5125T92G01 780365 GATJC8TP Power Turbine Drive Shaft Assy 5125T92G01 780366 GATJC90P Power Turbine Drive Shaft Assy 5125T92G01 780367 GATJCA4E Power Turbine Drive Shaft Assy 5125T92G01 780368 GATJC3G2 Power Turbine Drive Shaft Assy 5125T92G01 780369 GATJC6JE Power Turbine Drive Shaft Assy 5125T92G01 780370 GATJC1PP Power Turbine Drive Shaft Assy 5125T92G01 780371 GATJC6W5 Power Turbine Drive Shaft Assy 5125T92G01 780372 GATJC90M Power Turbine Drive Shaft Assy 5125T92G01 780373 GATJCALA Power Turbine Drive Shaft Assy 5125T92G01 780374 GATJCAPR Power Turbine Drive Shaft Assy 5125T92G01 780375 GATJC6HA Power Turbine Drive Shaft Assy 5125T92G01 780376 GATJCCG6 Power Turbine Drive Shaft Assy 5125T92G01 780377 GATJCAPK Power Turbine Drive Shaft Assy 5125T92G01 780378 GATJC90T Power Turbine Drive Shaft Assy 5125T92G01 780379 GATJCAFK Power Turbine Drive Shaft Assy 5125T92G01 780380 GATJCC35 Power Turbine Drive Shaft Assy 5125T92G01 780381 GATJCDHW Power Turbine Drive Shaft Assy 5125T92G01 780382 GATJCEH8 Power Turbine Drive Shaft Assy 5125T92G01 780383 GATJCF59 Power Turbine Drive Shaft Assy 5125T92G01 780384 GATJCEPW Power Turbine Drive Shaft Assy 5125T92G01 780385 GATJCEHC February 26, 2024 CT7-2E1 S/B 72-A0034 PAGE 12 GE Desig nated: - CONFIDENTIAL Subject to the restrictions on the media