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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES
1. PLANNING INFORMATION A. Effectivity (1) Engines affected: All installed and uninstalled Viper Mk.521 engines (2) Assemblies affected: All Group A components as detailed in Table 1. B. Reason A review of Group A Lifing by Rolls-Royce plc has resulted in reduced Flight Cycle Lives for the components listed in Table 1. Group A lives for these components that are presently documented in the Viper Mk.521 Overhaul Manual are unsupported.

January 2015 Performance Reliability Maintenance Overhaul Repair Schemes Interchangeability Not affected Improved Not affected Affected Not affected Not affected

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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES



### ItemC. Description 

### (1) This ALERT Service Bulletin instructs operators to implement the revised supported cleared lives in flight cycles for the following components detailed in Table1.

a e T b l 1 

### - Rev1sed G

### roup A Comoonent 1ves 

### Present cleared cyclic life (flights) Revised Ref Time Cleared Part No. Limits Chapter Cyclic Remarks 5-10-01 of Life Overhaul (flights) Manual dated Feb 2013 Compressor 

### Rotor Discs 

### Zero stage
1st stage

2nd stage

3rd stage

4th stage

5th stage

72-A408 Page 2 V27415 18900 5623 V56418 18900 5623 V27418 7030 1525 V900633 13000 11600 V901351 13000 11600 V27421 11475 2867 V41178 11475 11475 V901360 11475 11475 V22424 14075 2452 V27424 14075 2452 V41180 14075 121 60 V901361 14075 12160
V25191 14075 2891 V27427 14075 12160 V901362 14075 12160 V27430 12600 2074 V42057 12600 10480 V901363 12600 10480

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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES
Table 1 - Revised Group A Component Lives (cont.)

Item

6th stage

7th stage (front)

7th stage (rear)

7th stage sub unit <comprising V28501 front & V28502 rear discs) 7th stage sub unit (comprising V901365 front & V901366 rear discs) Rotating Shrouds Zero Stage

January 2015 Present cleared cyclic life (flights) Revised Ref Time Cleared Part No. Limits Cyclic Chapter 5- Life 10-01 of (flights) Overhaul Manual dated Feb 2013 V27433 12600 2074 V42059 12600 12000 V901364 12600 12000 V28382 2500 702 V42062 2500 702 V28501 16200 7673 V901365 16200 7673

V28383 2500 702 V42061 2500 702 V28502 16200 7673 V901366 16200 7673 V35813 16200 7673

V901359 16200 7673

V24671 2400 2400 V44045 2400 2400 V53088 2400 2400 V110422 2400 2400

Useordisclosureofthis infonnationissubjectto The restrictionsonthetitle pageofthis document Remarks

One overhaul life after salvage to V46088 72-A408

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# ALERTSERVICE BULLETIN Mk.521 Number 72-A408 Circulation B ENGINE REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES Table 1 - Revised Group A Component Lives (cont.)

Item

6th stage

Turbine

Turbine

72-A408 Page 4 Mainshaft

Disc Present cleared cyclic Life (flights) Revised Ref Time Limits Cleared Part No. Chapter 5- Cyclic 10-01 of Life Overhaul (flights) Manual dated Feb 2013 V26812 3900 3900 V27891 Unlimited Unlimited V44051 Unlimited Unlimited V48723 Unlimited Unlimited V107239 Unlimited Unlimited V109011 Unlimited Unlimited V110430 Unlimited Unlimited

V21171 3150 790 V25276 3150 790 V26569 3150 790 V29405 20000 5014 V44068 20000 5014 V42839 20000 5014 V36910 5000 1254 V36911 5000 1254 V36912 5000 1254

V25184 3600 630 V26832 7500 1314 V27502 7500 1314 V44810 5000 876 V56338 5000 876

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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES Table 1 -Revised Group A Component Lives (cont.) Present cleared cyclic Life (flights) Revised Ref Time Limits Cleared Item Part No. Chapter 5- Cyclic Remarks 10-01 of Life Overhaul (flights) Manual dated Feb 2013 Combustion Chamber Casing V22713 15000 5396 V44477 15000 5396 V45669 15000 5396 V45694 15000 5396 (2) Any components that have operated beyond the revised cleared Life in flight cycles must be removed from service operation. (3) Engine Log books and component log cards must be amended with the revised Lives. (4) The unsupportable Lives in Table 1 of this Bulletin are published in: Viper Mk.521 Overhaul Manual, Chapter 5-10, Table 1 (5) The above Manual will be updated to reflect the revised cleared Life in flight cycles published in Table 1.

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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES
D. Compliance (1) It is anticipated that this Alert Service Bulletin will become the subject of an EASA Airworthiness Directive. (2) Mandatory: on receipt of this Service Bulletin. (3) Refer to Engine Log book and/or the component Log card to establish the Time Since New (TSN) flight cycles Life for the Group A components in Table 1. (4) Installed engines- Immediately upon receipt of this Service Bulletin. (5) Engines not installed

- Prior to installation. (6) Uninstalled Group A components in Table 1 - Prior to installation in an engine. E. Approval The technical content of this ALERT Service Bulletin was approved under the authority of Design Organisation Approva·L EASA.21J.035 on 6th November 2014. F. Manpower- Field Embodiment Not applicable G. Material- Cost and Availability Price and availability from Rolls-Royce on request. H. Tooling

- Cost and Availability No additional special tools are required. I. Weight and Balance Engine weight change None J. Reference Viper Mk.521 Engine Overhaul Manual K. Publications Affected Viper Mk.521 Engine Overhaul Manual, Chapter 5-10, Table 1 72-A408 Page 6 Useordisclosureofthisinfonnation issubjectto The restrictionsonthe titlepageofthisdocument January 2015

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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 CircuLation B ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES 2. ACCOMPLISHMENT INSTRUCTIONS A. Installed and Uninstalled Engines (1) Check the engine Log book to establish the TSN flight cycles of each Group A component. If the component Life TSN is greater than the revised flight cycles Life Limit detailed in Table 1 of this bulletin, the engine must be removed from service operation. Proceed to Recording Instructions at Para 2.C of this bulletin. (2) If the component Life TSN is below the flight cycles detailed in Table 1 of this bulletin, but will exceed this total if operated to the next planned removal point, then the engine may continue in service operation until the revised flight cycle Life Limit is reached. Proceed to Recording Instructions at Para 2.C. of this bulletin. (3) If the component Life TSN is below the revised flight cycles Life Limit detailed in Table 1 of this bulletin, and the component will not exceed this total if operated to the next planned removal date then proceed to Recording Instructions at Para 2.C. of this bulletin. B. Uninstalled Group A Components. (1) Check the component Log card/relevant document to establish the TSN flight cycles of the component. If the component Life TSN is greater than the revised flight cycle Life detailed in Table 1 of this bulletin, the component must be rejected. Proceed to Recording Instructions at Para 2.C. of this bulletin. (2) If the component Life TSN is below the revised flight cycle Life detailed in Table 1 of this bulletin then proceed to Recording Instructions at Para 2.C. of this bulletin.

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# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES
C. Recording Instructions

72-A408 Page 8 (1) Installed Engines (a) Installed engines that contain Group A components that have exceeded the revised flight cycle Life Limit detailed in Table 1 of this bulletin, endorse the engine Log book with ''Engine removed from service operation for Group A Life expiry in accordance with SB72-A408''. Cb) Installed engines that contain Group A components that have not exceeded the revised flight cycle Life Limit as detailed in Table 1 of this bulletin, but will exceed the revised flight cycle Life Limit before the next planned engine removal, amend the engine Log book and component Log card/relevant document to reflect the revised flight cycle Life of each Group A component as detailed in Table 1 of this bulletin, and record compliance with SB72-A408. (c) Installed engines that contain Group A components that have not exceeded the revised flight cycle Life detailed in Table 1 of this bulletin, and will not exceed the Life Limit before the next planned engine removal, amend the engine Log book and component Log card/relevant document to reflect the revised flight cycle Life Limit of each Group A component as detailed in Table 1 of this bulletin, and record compliance with SB72- A408. (2) Uninstalled Engines (a) Uninstalled engines that contain Group A components that have exceeded the revised flight cycle Life Limit as detailed in Table 1 of this bulletin endorse the engine Log book with ''Engine declared unserviceable for Group A Life expiry in accordance with SB72-A408''.

Useordisclosureofthisinfonnation issubjectto Therestrictionsonthe titlepageofthisdocument January 2015ROLLS-ROYCE pic 

# ALERTSERVICEBULLETIN Mk.521 Number 72-A408 Circulation B ENGINE REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF COMPONENTS THAT HAVE OPERATED BEYOND THEIR SUPPORTABLE LIVES (b) Uninstalled engines that contain Group A components that have not exceeded the revised flight cycle life limit as detailed in Table 1 of this bulletin, amend the engine log book and component log card/relevant document to reflect the revised flight cycle life of each Group A component as detailed in Table 1 of this bulletin, and record compliance with SB72-A408. (3) Uninstalled Group A components (a) Components that have exceeded the revised flight cycle life limit as detailed in Table 1 of this bulletin, endorse the component log card with ''Life Expired in accordance with SB72-A408". (b) Components that have not exceeded the revised flight cycle life limit as detailed in Table 1 of this bulletin, amend the component log card/relevant document to reflect the revised flight cycle life limit detailed in Table 1 of this bulletin and record compliance with SB72- A408. D. Reporting Compliance Compliance with this Service Bulletin is to be reported to Rolls-Royce plc for each component.

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