# Rolls-Royce Service Bulletin 72-AJ985: No revision named - Rights: © Rolls-Royce plc. Filed by the FAA in regulations.gov docket FAA-2019-0338, the docket of AD 2019-11-07. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Rolls-Royce Service Bulletin 72-AJ985](https://openairdocs.org/service-documents/rolls-royce/72-aj985.md) - Title as filed: RR SB_72-AJ985_0 - Pages: 7 - PDF: https://openairdocs.org/files/sha256/c8/e9/c8e9d524aa037b04db677ed469d3354596731325d72cc39b3fbc4dfd7c699d2a - Page: https://openairdocs.org/service-documents/rolls-royce/72-aj985/file/c8e9d524aa03 ## 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 (OCR) P.O. Box 31, DERBY DE24 8BJ, UK Telephone: 44 (0) 1332 242424 Rolls-Royce Fax: 44 (0) 1332 249936 PUBLICATION TRANSMITTAL The technical information contained in this document has been approved under the authority of - See Planning Information, Approval. Date Apr. 17/18 RB211 524 G/H-T SERIES PROPULSION SYSTEMS NON-MODIFICATION SERVICE BULLETIN Printed in Great Britain This document transmits the Initial Issue of Service Bulletin RB211-72-AJ985 ALERT Bulletin Initial Issue Remove Incorporate Reason for change Pages 1 to 5 of the Initial Issue Service Bulletin ALERT RB.211-72-AJ985 Transmittal - Page 1 of 2 CHECK THAT ALL PREVIOUS TRANSMITTALS HAVE BEEN INCORPORATED If any have not been received please advise Customer Data Services, Rolls-Royce pic, Derby, England © Rolls-Royce plc (date as above) Printed in Great Britain ### Page 2 LIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin are as follows: Page Revision Number Revision Date Bulletin 1 Apr.17/18 2 Apr.17/18 3 Apr.17/18 4 Apr.17/18 5 Apr.17/18 Printed in Great Britain RB.211−72−AJ985 Transmittal - Page 2 ### Page 3 1. Planning Information A. Effectivity (1) Boeing 747 RB211-524G2-19, 524G2-19/11, 524G2-19/15, 524G2-T-19, 524G2-T-19/11, 524G2-T-19/15 Engines RB211-524G3-19, 524G3-19/15, 524G3-T-19, 524G3-T-19/15 Engines RB211-524H2-19, 524H2-19/11, 524H2-19/15, 524H2-T-19, 524H2-T-19/11, 524H2-T-19/15 Engines (2) Boeing 767 RB211-524H-36, 524H-36/11 Engines RB211-524H-T-36, 524H-T-36/11 Engines B. Reason (1) Problem A number of LP Compressor Shafts (UL24833, EIPC 72-31-20, 01-170) were subject to local repairs by an Operator MRO. These repairs were subsequently deemed to be detrimental to the shaft capability and repairs ceased in 2000. A 1250 cycle life reduction was imposed by artificially aging those LP Compressor shafts known to have been repaired. A further example of LP Compressor Shaft was identified in 2008 which had also been subject to the repair, but had not been identified during the initial investigation in 2000. This Shaft was also artificially aged, and all other LP Compressor Shafts that could have been repaired were subject to a temporary life reduction until the repair status could be confirmed. The temporary life reduction was applied by reducing the component DSCL in the engine records, this could then be corrected when the shaft had been removed at shop visit, visually inspected to confirm it had not been repaired, and the engine records updated again to restore the Shaft DSCL. Due to the retirement of the Operators fleet assets, not all engines were subject to the inspection prior to fleet redeployment and Engines were sold with the temporarily reduced DSCL Shaft life still in the engine records. Where possible the potentially repaired LP Compressor shafts have been investigated and all confirmed instances of repair status have been sentenced. ENGINE - LP COMPRESSOR SHAFT - LIFE REDUCTION - NON-MODIFICATION SERVICE BULLETIN - MOD.72-AJ985 Printed in Great Britain RB.211−72−AJ985 Page 1 of 5 Apr.17/18 Apr.17/18 ### Page 4 However the history of some Shafts has not been determined and efforts to confirm the repair status from the MRO or engine records has not been possible in all cases. In order to ensure that the subject Shafts do not exceed the reduced life it is necessary to reduce the published declared safe cyclic life of those Shafts. This Non-Modification Service Bulletin (NMSB) reduces the current declared cyclic life for the subject LP Compressor Shafts identified in 3.Accomplishment Instructions with immediate effect. (2) Safety Intent The Safety intent of this NMSB is to prevent exceedance of the LP Compressor Shaft reduced life following repair (or potential repair), which if not adhered too could lead to fracture of the LP Compressor shaft. C. Description This NMSB instructs 10 off LP Compressor Shafts (UL24833, EIPC 72-31-20, 01-170) identified in 3. Accomplishment Instructions as potentially being subject to an unauthorised repair, to be subject to a reduced Declared Safe Cyclic Life (DSCL) life of 10,500 cycles. D. Compliance ALERT This Non Modification Service Bulletin is anticipated to be the subject of an EASA Airworthiness Directive. This Non Modification Service Bulletin should be accomplished on all RB211-524G/H and -T engines within 1 month of receipt of this NMSB E. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.035 on Apr.13/18. F. Manpower (1) In shop Not Affected (2) On-wing Not Affected Printed in Great Britain RB.211−72−AJ985 Page 2 Apr.17/18 Apr.17/18 ### Page 5 G. Material Price and Availability Not affected H. Tooling Price and Availability Not affected I. References Time Limits Manual Subtask 05-10-01-890-300 Printed in Great Britain RB.211−72−AJ985 Page 3 Apr.17/18 Apr.17/18 ### Page 6 2. Material Information None Printed in Great Britain RB.211−72−AJ985 Page 4 Apr.17/18 Apr.17/18 ### Page 7 3. Accomplishment Instructions A. The DSCL for the LP Compressor Shafts is reduced for the following serial numbers only: IPC Fig/Item No. Part Number Declared Life (Flight Cycles) (72-31-20, 01-170) UL24833 10,500 Serial Numbers PAVN1765 PAVN1853 PAVN2152 PAVN2157 PAVN2259 PAVN2636 PAVN2991 PAVN2992 PATH3121 PATH3113 Time Limits Manual SUBTASK 05-10-01-890-300 (Config 1) and 05-10-01-890-325 (Config 2) will be amended to reduce the life of these components Printed in Great Britain RB.211−72−AJ985 Page 5 Apr.17/18 Apr.17/18 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. 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