ROLLS-ROYCE pic 

ALERT SERVICE 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 

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 

9 Pages 

Use or disclosure of this information is subject to 

The restrictions on the title page of this document 

72-A408 

Page 1 
ROLLS-ROYCE pic 

ALERT SERVICE 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 

Item 

C. 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. 

T b l 1 a e - R ev1se d G roup A C omoonent 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 1 4075 2452 

V27424 14075 2452 

V41180 14075 1 21 60 

V901361 14075 1 2160 

V25191 14075 2891 

V27427 14075 12160 

V901362 14075 12160 

V27430 12600 2074 

V42057 12600 10480 

V901363 12600 10480 

Use or disclosure of this infonnation is subject to 

The restrictions on the title page of this document 

January 2015 
ROLLS-ROYCE pic 

ALERT SERVICE 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 

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 1 2600 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 

Use or disclosure of this infonnation is subject to 

The restrictions on the title page of this document 

Remarks 

One overhaul 

life after 

salvage to 

V46088 

72-A408 

Page 3 
ROLLS-ROYCE pic 

ALERT SERVICE 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) 

Ref Time Revised 

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 1 31 4 

V44810 5000 876 

V56338 5000 876 

Use or disclosure of this infonnation is subject to 

The restrictions on the Utle page of this document 

Remarks 

January 2015 
ROLLS-ROYCE pic 

ALERT SERVICE 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.) 

Present 

cleared 

cyclic Life 

(flights) 

Ref Time Revised 

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. 

January 2015 

Use or disclosure of this information is subject to 

The restrictions on the title page of this document 

72-A408 

Page 5 
ROLLS-ROYCE pic 

ALERT SERVICE 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 

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 Use or disclosure of this infonnation is subject to 

The restrictions on the title page of this document 

January 2015 
I ROLLS-ROYCE pic 

ALERT SERVICE BULLETIN 

Mk.521 Number 72-A408 

Ci rcu Lati on 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. 

January 2015 72-A408 

Use or disclosure of this information is subject to 

The restrictions on the title page of this document 

Page 7 
ROLLS-ROYCE pic 

ALERT SERVICE 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 

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''. 

Use or disclosure of this infonnation is subject to 

The restrictions on the title page of this document 

January 2015 
ROLLS-ROYCE pic 

ALERT SERVICE 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 

(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. 

January 2015 72-A408 

Use or disclosure of this information is subject to 

The restrictions on the title page of this document 

Page 9/10