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

Date
LIST 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 2
1. Planning Information

A. Effectivity

Boeing 757

RB211-535E4-37

R with Part Number UL27681 and UL39767 only. HP Turbine disc on Flight Plan A

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.

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R

R New stress and lifing analysis of the HP turbine disc using updated methods

R shows a small reduction in predicted life for E4-37 Flight Plan A operation.

R to comply with airworthiness regulations, it will become Consequently,

R Declared Safe Cyclic Limit (DSCL) in the Time Limits necessary to reduce the

R RB211-535E4-37 Flight Plan A operation. The life will be Manual (TLM) for the

R flight cycles to 19,500 flight cycles on the 1st of July, reduced from 20,000

2014.

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No other flight plan will be affected.

R is issued to clarify the actions to be taken at shop Revision 1 of this NMSB

visit.

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C. Compliance

RECOMMENDED

This Non-Modification Service Bulletin is anticipated to be the subject of an

EASA Airworthiness Directive.

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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

R revision to the Time Limits Manual 05-10-01, see References (1.H.).

R Before 1st July 2014:

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.

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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

R Oct.30/13
At the first applicable refurbishment, an operator must comply with para 3.

Accomplishment Instructions.

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R

R On or after 1st July 2014:

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.).

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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.

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E. Manpower

Not Affected

F. Material Price and Availability

Not Applicable

G. Tooling Price and Availability

Not Applicable

H. References

R Group A Parts Lives. Time Limits Manual, 05-10-01, CONFIG-1,

2. Material Information

None

Printed in Great Britain

RB.211−72−G188

Page 2

May 28/09

R Oct.30/13
3. Accomplishment Instructions.

Operators can use the Provisional Limits highlighted in Appendix 1 to prepare for

the change in limits.

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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.

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The part must be replaced if one or more of the two conditions that follow are

correct:

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(1) The part will exceed the Provisional Limit (Flight Cycles) before the next

planned applicable refurbishment.

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(2) The part will exceed the Provisional Limit (Flight Cycles) before the

defined compliance date given in Compliance (1.C.).

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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:

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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.

Printed in Great Britain

RB.211−72−G188

Page 3

May 28/09

R Oct.30/13
Revised 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.

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R The life limits for the affected parts are as follows:

RB211-535 E4-37

R ONLY

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

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R

R

R

R

Time limits Manual

Ref.

R (72-41-51,01-350)

UL27681

R 19,500 A 20,000 19,500 TLM:05-10-01-800-000,

R CONFIG-1

R (72-41-51,01-350)

UL39767

R 19,500 A 20,000 19,500 TLM:05-10-01-800-000,

R CONFIG-1

All other sections of Chapter 05-10-01-800-000, CONFIG-1 remain unchanged and must

be obeyed as normal.

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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.

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APPENDIX 1

Printed in Great Britain

RB.211−72−G188

Appendix 1 - Page 1 of 1

May 28/09

R Oct.30/13