### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

January 2015 9 Pages 7 2

- A408
Page 1

Use or disclosure of this information is subject to The restrictions on the title page of this document 1. PLANNING INFORMATION

A. Effectivity

(1) Engine s affected: All inst alled and uninstalled Viper

Mk. 521 engines

(2) Asse mbl ies 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.

Performance : Not affected Reliability : Improved

Maintenance : Not affected

Overhaul : Affected Repair Schemes : Not affected Interchangeability : Not affected

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

72

- A408 January 2015
Page 2 Use or disclosure of this information is subject to The restrictions on the title page of this document 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

Table 1.

Table 1

- Revised Group A Component Lives

Item Part No. Present

c leared cyclic life (flights)

Ref Time Limits Chapter

5

- 10

- 01 of

Overhaul

Manual dated

Feb 2013 Revised

Cleared Cyclic

Life (flights) Remarks

Compressor

Rotor Discs

Zero stage V27415

V56418 18900

1 8900 5623

5623

1 st stage V27418

V900633

V901351 7030

13000

13000 1525

11600

11600

2 nd stage V27421

V41178

V901360 11475

11 475

11475 2867

11475

11475

3rd stage V22424

V27424

V41180

V901361 14075

14075

14075

14075 2452

2452

12160

12160

4th stage V25191

V27427

V901362 14075

14075

14075 2891

12160

12160

5th stage V27430

V42057

V901363 12600

12600

12600 2074

10480

10480

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

January 2015 7 2

- A408
Page 3

Use or disclosure of this information is subject to The restrictions on the title page of this document Table 1

- Revised Group A Component Lives (cont.)

Item Part No. Present

c leared cyclic life (flights)

Ref Time

Limits Chapter 5

- 10

- 01 of

Overhaul

Manual dated

Feb 2013 Revised

Cleared Cyclic

Life (flights) Remarks

6th stage V27433

V42059

V901364 12600

12 600

12600 2074

12000

12000

7th stage (front) V28382

V42062

V28501

V901365 2500

2500

16200

16200 702

702

7673

7673

7th stage (rear) V28383

V42061

V28502

V901366 2500

2500

16200

16200 702

702

7673

7673

7th stage sub unit (comprising

V28501 front &

V28502 rear

discs) V35813 16200 7673

7th stage sub

unit (comprising

V901365 front &

V901366 rear

discs) V901359 16200 7673

Rotating Shrouds

Zero Stage V24671

V44045

V53088

V110422 24 00

2400

2400

2400 2400

2400

2400

2400 One overhaul

life after salvage to

V46088

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

72

- A408 January 2015
Page 4 Use or disclosure of this information is subject to The restrictions on the title page of this document Table 1

- Revised Group A Component Lives (cont.)

Item Part No. Present

c leared cyclic life (flights)

Ref Time

Limits Chapter 5

- 10

- 01 of

Overhaul

Manual

dated Feb

2013 Revised

Cleared Cyclic

Life (flights) Remarks

6th stage V26812

V27891

V44051

V48723

V107239

V109011

V110430 3900

Unlimited

Unlimited

Unlimited

Unlimited

Unlimited

Unlimited 3900

Unlimited

Unlimited

Unlimited

Unlimited

Unlimited

Unlimited

Turbine Mainshaft

V21171

V25276

V26569

V29405

V44068

V42839

V36910

V36911

V36912 3150

3150

3150

2 0000

20000

20000

5000

5000

5000 790

790

790

5014

5014

5014

1254

1254

1254

Turbine Disc

V25184

V26832

V27502

V44810

V56338 3600

7500

7500

5000

5000 630

1314

1314

876

876

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

January 2015 7 2

- A408
Page 5

Use or disclosure of this information is subject to The restrictions on the title page of this d ocument Table 1

- Revised Group A Component Lives (cont.)

Item Part No. Present

c leared cyclic life (flights)

Ref Time

Limits Chapter 5

- 10

- 01 of

Overhaul

Manual

dated Feb

2013 Revised

Cleared Cyclic

Life (flights) Remarks

Combustion

Chamber Casing

V22713

V44477

V45669

V45694 15000

15000

15000

15000 5396

5396

5396

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 unsuppor t able l ives 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

.

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

72

- A408 January 2015
Page 6 Use or disclosure of this information is subject to The restrictions on the title page of this document D. Compliance

(1) It is anticipated that this Alert Service Bulletin

will become the s ubject of an EASA Airworthiness

Directive.

(2) Mandatory: on r eceipt 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

- I mmediately upon receipt of this

S ervice B ulletin

.

(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
Approval EASA.21J.035 on 6 th November 201 4

.

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 M k.521 Engine Overhaul Manual, Chapter 5

- 10 , Table 1

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

January 2015 7 2

- A408
Page 7

Use or disclosure of this information is subject to The restrictions on the title page of this d ocument 2

. ACCOMPLISHMENT INSTRUCTIONS

A. Installed and Uninstalled E ngines

( 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 T able 1 of this bulletin, the engine m ust be removed from service operation. Proceed

to R ecording I nstructions 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 planne d 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 t his bulletin, and the component will not exceed th is 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

Rec ording 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.

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

72

- A408 January 2015
Page 8 Use or disclosure of this information is subject to The restrictions on the title page of this document C

. Recording Instructions

(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 oper ation for Group A life expiry in

accordance with SB72

- A 408 ”

.

(b) 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 compon ent log

card/relevant document to reflect the revised
flight cycle life of each Group A component as

detail ed in Table 1 of this bulletin, and r ecord
compliance with SB72

- A 408

.

(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 compon ent 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

-

A 40 8

.

( 2 ) Uni nstalled Engines

(a) Uni nstalled 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 unserviceabl e for Group A life expiry in

accordance with SB72

- A 408 ”.

### ROLLS

- ROYCE plc



# ALERT SERVICE BULLETIN

Mk. 521 Number 72

- A408

Circulation A

ENGINE

- REVISED COMPONENT GROUP A LIVES AND REMOVAL FROM SERVICE OF

COMPONENTS THAT HAVE OPERATED BEYOND THE IR SUPPORTABLE LIVES

January 2015 7 2

- A408
Page 9 /10

Use or disclosure of this information is subject to The restrictions on the title page of this document (b) U ninstalled 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

- A 408

.

(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

- A 408 ”.

(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 t he revised
flight cycle life limit detailed in Table 1 of
this bulletin and record compliance with SB72

-

A 408

.

D. Re porting Compliance

Compliance with this Service Bulletin is to be reported to

Rolls

- Royce plc for each component.