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This document transmits Revision 2 to Service Bulletin TRENTXWB-72-AK188 Document History Service Bulletin Revision Status Supplement Revision Status Initial Issue Aug.13/19 Revision 1 Sep.20/19 Bulletin Revision 2 Remove Incorporate Reason for change Pages 1 to 37 of the Service Bulletin Pages 1 to 38 of the Service Bulletin Updated to clarity to limits in 3. Accomplishment Instructions and to update Appendix 1.
Page 1 of Appendix 1 Page 1 and 2 of Appendix 1 Updated to clarity to limits in 3. Accomplishment Instructions and to update Appendix 1.
All pages of Appendix 2 Page 1 of Appendix 2 Updated to clarity to limits in 3. Accomplishment Instructions and to update Appendix 1.
Printed in Great Britain Dec.17/19
TRENT XWB SERIES PROPULSION SYSTEMS NON-MODIFICATION SERVICE BULLETIN ALERT TRENT XWB 72−AK188 Transmittal - Page 1 of 3 Date ALERT
CHECK THAT ALL PREVIOUS TRANSMITTALS HAVE BEEN INCORPORATED If any have not been received please advise Customer Data Services, Rolls-Royce plc, Derby, England ©Rolls-Royce plc (date as above) Printed in Great Britain
LIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin following incorporation of Revision 2 are as follows:
Page Revision Number Revision Date Bulletin R 1 2 Dec.17/19 R 2 2 Dec.17/19 R 3 2 Dec.17/19 R 4 2 Dec.17/19 R 5 2 Dec.17/19 R 6 2 Dec.17/19 R 7 2 Dec.17/19 R 8 2 Dec.17/19 R 9 2 Dec.17/19 R 10 2 Dec.17/19 R 11 2 Dec.17/19 R 12 2 Dec.17/19 R 13 2 Dec.17/19 R 14 2 Dec.17/19 R 15 2 Dec.17/19 R 16 2 Dec.17/19 R 17 2 Dec.17/19 R 18 2 Dec.17/19 R 19 2 Dec.17/19 R 20 2 Dec.17/19 R 21 2 Dec.17/19 R 22 2 Dec.17/19 R 23 2 Dec.17/19 R 24 2 Dec.17/19 R 25 2 Dec.17/19 R 26 2 Dec.17/19 R 27 2 Dec.17/19 R 28 2 Dec.17/19 R 29 2 Dec.17/19 R 30 2 Dec.17/19 R 31 2 Dec.17/19 R 32 2 Dec.17/19 R 33 2 Dec.17/19 R 34 2 Dec.17/19 R 35 2 Dec.17/19 R 36 2 Dec.17/19 R 37 2 Dec.17/19 R 38 2 Dec.17/19 Appendix 1 R 1 2 Dec.17/19 R 2 2 Dec.17/19 Appendix 2 Printed in Great Britain TRENT XWB 72−AK188 Transmittal - Page 2
R 1 2 Dec.17/19 Printed in Great Britain TRENT XWB 72−AK188 Transmittal - Page 3
1. Planning Information A. Effectivity Airbus A350-900 All Trent XWB-75 Engines All Trent XWB-79 Engines All Trent XWB-79B Engines All Trent XWB-84 Engines B. Reason
(1) Problem The purpose of the engine mount is to position the engine relative to the aircraft pylon and to transfer all loads and rotational moments between engine and aircraft pylon.
The front Engine Mount Support Structure (EMSS) comprises of the LP Compressor Outlet Guide Vane (OGV) assembly and OGV Outer Mount Ring Assembly (CSN 72354601150).
Revised analysis of these parts when the Front Mount Catcher Lug is engaged in the failsafe condition has now been undertaken using more advanced modelling techniques. This gives a more comprehensive understanding of the loading and therefore stresses in the structure. This analysis predicts that once the Front Engine Mount is in the failsafe condition, the most highly stressed LP Compressor OGV (CSN 72354601500) has a life that could be substantially lower than one shop visit.
This Non-Modification Service Bulletin (NMSB) introduces an inspection to protect against the front engine mount entering the failsafe condition via a failure of the OGV Outer Mount Ring Assembly outer rail lug fillet.
(2) Safety Intent The safety intent of this Non-Modification Service Bulletin (NMSB) is to confirm that the OGV Outer Mount Ring Assembly lug fillet area is not cracked, to prevent any potential progression to failsafe operation when the life of the EMSS is predicted to be low and failure of the EMSS could occur.
ENGINE - RING, ASSY OGV OUTER MOUNT - FLUORESCENT PENETRANT INSPECTION OF THE MOUNT RING OUTER RAIL LUG FILLETS - NON-MODIFICATION SERVICE BULLETIN - MOD.72-AK188 Printed in Great Britain TRENT XWB 72−AK188 Page 1 of 38 Aug.13/19 Dec.17/19R
TRENT XWB SERIES
SERVICE BULLETIN
C. Description This NMSB instructs the repeat inspection of the OGV Outer Mount Ring Assembly using a fluorescent penetrant technique (FPI).
Accomplishment of this NMSB is to be recorded in accordance with local Service Bulletin tracking system procedures and a completed copy of Appendix 1 (or similar form) returned to your Rolls-Royce Representative upon completion of the inspection.
Revision 1 of this NMSB was issued to correct a cleaning procedure reference in
3.B In-Shop Accomplishment Instructions.
R R Revision 2 of this NMSB is issued to clarify the limits for redeposited material/blackspots in 3.A. and 3.B. Accomplishment Instructions and to clarify labelling of the fillets in Appendix 1.
R R R D. Compliance
(1) On-Wing ALERT This Non-Modification Service Bulletin is anticipated to be the subject of an EASA Airworthiness Directive.
Carry out 3. A. Accomplishment Instructions on engines listed in 1. A.
Effectivity before achieving 2000 flight cycles since new and every 1000 flight cycles thereafter. For engines which have exceeded 1700 flight cycles since new at the point of publication of this NMSB and not embodied this NMSB, inspect within 300 flight cycles after the publication of the NMSB or before 30th April 2020 whichever occurs first and thereafter at intervals of no more than 1000 flight cycles.
For engines ESN 21021, ESN 21032, ESN 21033, ESN 21038, ESN 21041, ESN 21043, ESN 21044, ESN 21065, ESN 21088 and ESN 21188 carry out 3.A.
Accomplishment Instructions before 30th November 2019 and thereafter at intervals of no more than 1000 flight cycles.
(2) In-Shop ALERT Carry out the inspection in accordance with 3.B. Accomplishment Instructions on engines listed in 1.A. Effectivity at any module shop visit Workscope of Level 1 (Serviceability) or above if the engine is at 1750 flight cycles since new or greater and the inspection has not been carried out in the last 250 flight cycles.
Printed in Great Britain TRENT XWB 72−AK188 Page 2 Aug.13/19 Dec.17/19R
TRENT XWB SERIES
SERVICE BULLETIN
Any applicable repeat inspection requirements for mount rail lug fillets as defined in this NMSB must be recorded in the carry forward sheet. If an inspection is completed In-Shop, it is the responsibility of the MRO facility to report the inspection results in accordance with the instructions using the feedback form (or similar) in the NMSB.
E. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.065 on Aug.12/19 and was re-approved Dec.17/19.
R R F. Manpower
(1) On-wing
(a) Time to gain access
0.5 hours (1 person * 0.5 hours) - Estimated
(b) Time to inspect 2 hours (1 person * 2 hours) - Estimated The Fluorescent Penetrant Inspection (FPI) defined in this NMSB shall only be performed by personnel qualified to FPI Level 2 or higher and in possession of up-to-date eyesight record in accordance with EN4179/NAS410 or alternative standards/guidelines accepted by the applicable National Aviation Authority.
(c) Time to restore to serviceable condition
0.5 hours (1 person * 0.5 hours) - Estimated
(2) In-shop Not Applicable NOTE: The parts affected by this NMSB are accessible in-shop when carrying out a Level 1 or above workscope.
G. Material Price and Availability For Material price and availability contact your assigned Rolls-Royce Representative.
Printed in Great Britain TRENT XWB 72−AK188 Page 3 Aug.13/19 Dec.17/19R
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SERVICE BULLETIN
H. Tooling Price and Availability Part Description Quantity Fan case access ladders RRT081482 (or equivalent) 1 Dark Non-Reflective cover to darken the area for inspection No specific As necessary Battery powered Ultraviolet Light Source capable of providing a minimum UV radiation intensity of 1200 microwatts per square centimetre at the inspection surface.
No specific 1 Battery powered White light source, capable of providing a minimum of 1000 Lux at the inspection surface No specific 1 Temporary stand/tripod for positioning inspection lights No specific 1 Calibrated light radiometer, containing both UV and visible sensor No specific 1 I. References
(1) Maintenance Procedures:
(a) A350-A-71-13-XX-00001-398A-A: Opening of the Fan Cowl Doors with the Power Door Opening System (PDOS).
(b) A350-A-70-21-XX-00001-25BA-A: Cleaning and Coating Removal with Non-Aqueous Liquid Degreasing.
(c) A350-A-70-8X-XX-00001-398A-A: List of Materials - Maintenance Practices.
(d) A350-A-70-30-61-00001-398A-A: Inspection of Cracks with Fluorescent Penetrant Printed in Great Britain TRENT XWB 72−AK188 Page 4 Aug.13/19 Dec.17/19R
TRENT XWB SERIES
SERVICE BULLETIN
(e) A350-A-71-21-61-00001-310A-A: Detailed Inspection of the Forward Engine Mount
(f) A350-A-71-13-XX-01001-398A-A:R Closing of the Fan Cowl Doors with the Power Door Opening System (PDOS).
(2) Overhaul Process Manual (TSD594J):
(a) TASK 70-00-00-100-101 - Overhaul Process 101 - Non-Aqueous Vapour and Liquid Degreasing.
(b) TASK 70-00-00-200-210 - Overhaul Process 210 - Fluorescent Penetrant Inspection.
Printed in Great Britain TRENT XWB 72−AK188 Page 5 Aug.13/19 Dec.17/19R
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SERVICE BULLETIN
2. Material Information A. Consumables, materials and expendables Name Quantity Remarks AMS2644 Type 1, Method D, Level 2 (1D2) compliant aerosol penetrant (Fluorescent, Post Emulsified, Medium Sensitivity) As necessary OMat 650 AMS2644 Type 1, Method D, Level 4 (1D4) compliant aerosol penetrant (Fluorescent, Post Emulsified, Ultra-high Sensitivity) As necessary OMat 652 AMS2644 Type 1, Method A, Level 3 (1A3) compliant aerosol penetrant (Fluorescent, water washable, High Sensitivity) As necessary OMat 632 AMS2644 Form D - Non-Aqueous Wet Developer
- Aerosol As necessary OMat 617 Acetone based solvent degreaser As necessary OMat 150 Penetrant 1D2 test panel (TAM Panel) As necessary OMat 677 Penetrant 1D4 test panel (TAM Panel) As necessary OMat 677 Penetrant 1A3 test panel (TAM Panel) As necessary OMat 677 Absorbent Cloths, Lint Free As necessary OMat 2-101 Printed in Great Britain TRENT XWB 72−AK188 Page 6 Aug.13/19 Dec.17/19R
TRENT XWB SERIES
SERVICE BULLETIN
Scotch-brite As necessary OMat 582 Scotch-brite As necessary OMat 583 Sponge type cotton buds As necessary No specific Disposable plastic nitrile gloves As necessary No specific Waterproof, Silicon Carbide As necessary OMat 5/36 Waterproof, Silicon Carbide As necessary OMat 5/32 Emery, Polishing Paper As necessary OMat 5/60 Emery, Polishing Paper As necessary OMat 5/54 Printed in Great Britain TRENT XWB 72−AK188 Page 7 Aug.13/19 Dec.17/19R
TRENT XWB SERIES
SERVICE BULLETIN
3. Accomplishment Instructions A. On-wing WARNING: BE CAREFUL WHEN YOU DO THIS PROCEDURE. OBEY THE EQUIPMENT MANUFACTURER'S HEALTH AND SAFETY INSTRUCTIONS AND YOUR LOCAL REGULATIONS. INJURY CAN OCCUR IF YOU DO NOT OBEY THESE INSTRUCTIONS.
WARNING: DO NOT OPERATE AN ULTRAVIOLET SOURCE IF IT DOES NOT HAVE A FILTER OR THE FILTER DOES NOT HAVE THE CORRECT FIT OR THE FILTER HAS A CRACK.
ULTRAVIOLET RADIATION THAT IS NOT FILTERED CAN CAUSE INJURY TO YOUR EYES AND SKIN.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE IS SHUT DOWN. THE ENGINE PARTS CAN STAY HOT FOR ALMOST 1 HOUR.
WARNING: DO NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.
CAUTION: THE FLUORESCENT PENETRANT SHOULD BE ONLY APPLIED ON THE INSPECTION SURFACE. DO NOT LET THE FLUORESCENT PENETRANT GO INTO ANY LOCATION OTHER THAN THE INSPECTION SURFACE. IF THE FLUORESCENT PENETRANT GOES INTO ANY
LOCATION OTHER THAN THE INSPECTION SURFACE, STOP THE PROCEDURE AND CONTACT ROLLS-ROYCE FOR FURTHER INSTRUCTIONS.
CAUTION: MAKE SURE THAT ONLY PERSONS WHO ARE APPROVED BY THE APPLICABLE AUTHORITY DO THESE PROCEDURES. PERSONS WHO ARE NOT APPROVED CAN POSSIBLY GET AN INCORRECT RESULT, WHICH CAN SUBSEQUENTLY CAUSE COMPONENT FAILURE.
CAUTION: USE ONLY THE CONSUMABLE MATERIALS GIVEN IN THIS TASK. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN GET AN UNSATISFACTORY RESULT.
CAUTION: THE USE OF HAND HELD AIR AND ELECTRICAL POWER TOOLS IS NOT PERMITTED.
CAUTION: DO NOT LET THE FLUORESCENT PENETRANT REMOVER STAY ON THE SURFACE FOR MORE THAN THE SPECIFIED TIME. IF THE REMOVER STAYS ON THE SURFACE FOR MORE THAN THE SPECIFIED TIME, YOU CAN GET AN INCORRECT RESULT. THIS CAN SUBSEQUENTLY CAUSE COMPONENT FAILURE.
CAUTION: DO NOT USE A TEST PANEL TAM (PSM-5) THAT WAS USED WITH A FLUORESCENT PENETRANT WITH A DIFFERENT OMAT NUMBER. IF YOU DO, YOU CAN GET AN
INCORRECT RESULT AND THIS CAN SUBSEQUENTLY CAUSE COMPONENT FAILURE Printed in Great Britain TRENT XWB 72−AK188 Page 8 Aug.13/19 Dec.17/19R
TRENT XWB SERIES
SERVICE BULLETIN
CAUTION: IN ORDER TO REDUCE THE POTENTIAL FOR MULTIPLE ENGINE IN-FLIGHT SHUTDOWN,
POWER LOSS, OR OTHER ANOMALY DUE TO MAINTENANCE ERROR, ROLLS-ROYCE
RECOMMENDS THAT OPERATORS AVOID PERFORMING MAINTENANCE ON MULTIPLE ENGINES INSTALLED ON THE SAME AIRCRAFT AT THE SAME TIME. IF IT IS NOT
POSSIBLE TO AVOID MAINTENANCE ON MORE THAN ONE ENGINE AT THE SAME TIME,
ROLLS-ROYCE RECOMMENDS THAT ADDITIONAL CONTROLS ARE APPLIED IN ORDER TO ENSURE THAT MAINTENANCE TASKS HAVE BEEN COMPLETED AS DEFINED.
MAINTENANCE GUIDELINES SHOULD BE REVISED, WHERE POSSIBLE, TO PROMOTE THIS RECOMMENDATION.
(1) Perform the following tasks to gain access (if the engine is not installed on an aircraft, start the procedure at Step 3.A.(2)) and then inspect the OGV Outer Mount Ring Assembly (72-35-65, 01-150), in accordance with the following steps:
(a) Open the fan cowl doors, refer to MP A350-A-71-13-XX-00001-398A-A.
(b) Put the fan case access ladders RRT081482 (or eqivalent) in position.
(2) Perform a detailed inspection of the forward engine mount catcher pin front-plate (71-21-61, 01-523) and the front mount bracket (71-21-61, 01-500) in accordance with MP A350-A-71-21-61-00001-310A-A.
(3) For the following Fluorescent Penetrant Inspection (FPI) use OMat 650 Penetrant where Penetrant is referred to and use OMat 677 Penetrant 1D2 test panel (TAM panel) where an OMat 677 Penetrant test panel is referred to unless otherwise instructed.
(4) Prepare the OGV Outer Mount Ring outer rail lug fillets (72-35-65, 01-150), see Figures 1 to 5 for inspection area, for FPI inspection in accordance with the following steps:
(a) Clean the inspection areas prior to FPI in accordance with the following steps, refer to MP A350-A-70-21-XX-00001-25BA-A:
Printed in Great Britain TRENT XWB 72−AK188 Page 9 Aug.13/19 Dec.17/19R