This document transmits Revision 1 to Service Bulletin RB211-72-G188 Document History Service Bulletin Revision Status Supplement Revision Status Initial Issue May 28/09 Bulletin Revision 1 Remove Incorporate Reason for change All pages of the Service Bulletin Pages 1 to 3 of the Service Bulletin To clarify the actions to be taken at shop visit Page 1 of Appendix 1 To clarify the actions to be taken at shop visit**Printed in Great Britain** Oct.30/13

RB211-535 SERIES PROPULSION SYSTEM NON-MODIFICATION SERVICE BULLETIN



# RB.211−72−G188 Transmittal - Page 1 of 2 DateLIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin following incorporation of Revision 1 are as follows: Page Revision Number Revision Date

Bulletin R 1 1 Oct.30/13 R 2 1 Oct.30/13 R 3 1 Oct.30/13 Appendix 1 R 1 1 Oct.30/13**Printed in Great Britain**



# RB.211−72−G188 Transmittal - Page 21. Planning Information A. Effectivity Boeing 757 RB211-535E4-37 HP Turbine disc on Flight Plan A R with Part Number UL27681 and UL39767 only.
B. Reason This NMSB was originally issued ahead of a change to the DSCL in the TLM (ATA Chapter 05-10-01), which will occur on the 1st of July 2014. R R New stress and lifing analysis of the HP turbine disc R using updated methods shows a small reduction in predicted life for E4-37 Flight Plan R A operation. Consequently, R to comply with airworthiness regulations, it will become necessary to reduce the R Declared Safe Cyclic Limit (DSCL) in the Time Limits Manual (TLM) for the R RB211-535E4-37 Flight Plan A operation. The life will be reduced from 20,000 R flight cycles to 19,500 flight cycles on the 1st of July, 2014. R R No other flight plan will be affected. Revision 1 of this NMSB R is issued to clarify the actions to be taken at shop visit. R R C. Compliance
RECOMMENDED This Non-Modification Service Bulletin is anticipated to be the subject of an EASA Airworthiness Directive. R R R The applicable time limits are shown in Appendix 1. Appendix 1 also shows the change in DSCL that will occur on 1st July, 2014 R R and will be included in a revision to the Time Limits Manual 05-10-01, see References (1.H.). R Before 1st July 2014: R A Provisional Limit of 19,500 flight cycles is applicable. Operators are permitted to fly with disc lives between the Provisional Limit and the DSCL until the first applicable refurbishment. An applicable refurbishment is defined in Accomplishment Instructions (para 3.) below. R R R R ENGINE - HP TURBINE DISC - LIFE REDUCTION OF P/N UL27681 AND UL39767 (FLIGHT PLAN A) NON-MODIFICATION SERVICE BULLETIN - MOD.72-G188**Printed in Great Britain**



# RB.211−72−G188 Page 1 of 3 May 28/09 Oct.30/13 RAt the first applicable refurbishment, an operator must comply with para 3. Accomplishment Instructions. R R On or after 1st July 2014: R The Provisional Limit (19,500 flight cycles) will become the DSCL for Flight Plan A on 1st July 2014. The current DSCL of 20,000 flight cycles for Flight Plan A will be removed from the TLM 05-10-01, see References (1.H.). R R R D. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.035 on May.13/09, and again on Oct.24/13. R R E. Manpower Not Affected F. Material Price and Availability Not Applicable G. Tooling Price and Availability Not Applicable H. References Time Limits Manual, 05-10-01, CONFIG-1, R Group A Parts Lives. 2. Material Information
None**Printed in Great Britain**



# RB.211−72−G188 Page 2 May 28/09 Oct.30/13 R3. Accomplishment Instructions. Operators can use the Provisional Limits highlighted in Appendix 1 to prepare for the change in limits. R R During overhaul, the part life must be recalculated when an affected engine is inducted for an applicable refurbishment. An applicable refurbishment is where the HP turbine blades are removed from the HP turbine disc. R R R The part must be replaced if one or more of the two conditions that follow are correct: R R (1) The part will exceed the Provisional Limit (Flight Cycles) before the next planned applicable refurbishment. R R (2) The part will exceed the Provisional Limit (Flight Cycles) before the defined compliance date given in Compliance (1.C.). R R Normal Pro-rata (intermix) calculations are applicable for calculation of the part life for movement between the engine flight plans. The Provisional Limit must be used for intermix calculations as follows: R R R The movement of engines from Flight Plan A to other Flight Plans. R The movement of engines from other Flight Plans to Flight Plan A. R**Printed in Great Britain**



# RB.211−72−G188 Page 3 May 28/09 Oct.30/13 RRevised Time Limits For the initial issue of this NMSB, the RB211-535E4-37 TLM (Chapter 05-10-01-800-000, CONFIG-1) was changed to refer to this NMSB 72-G188. R R The life limits for the affected parts are as follows: R RB211-535 E4-37 ONLY R Flight Plan Current DSCL (Flight Cycles) R R R R Provisional Limit (Flight Cycles) R R R DSCL (Flight Cycles) on and after 1st July 2014 R R R R R R Time limits Manual Ref.

(72-41-51,01-350) R UL27681 A 20,000 R 19,500 19,500 TLM:05-10-01-800-000, CONFIG-1 R (72-41-51,01-350) R UL39767 A 20,000 R 19,500 19,500 TLM:05-10-01-800-000, CONFIG-1 R All other sections of Chapter 05-10-01-800-000, CONFIG-1 remain unchanged and must be obeyed as normal. R R
NOTE : On 1st July 2014, the RB211-535E4-37 TLM (05-10-01, CONFIG-1) will be revised to remove the current limit of 20,000 CSN (Flight Cycles) for Flight Plan A. The new limit of 19,500 CSN will then become the only applicable limit for these parts operated on Flight Plan A. R R R R APPENDIX 1**Printed in Great Britain**



# RB.211−72−G188 Appendix 1 - Page 1 of 1 May 28/09 Oct.30/13 R