This document transmits the Initial Issue of Non-Modification Service Bulletin

TAY-72-A1772.

Non-Modification Service Bulletin Initial Issue

Remove Incorporate Reason for change

Pages 1 to 8 of the

Non-Modification

Service Bulletin.

Initial Issue.

Printed in Great Britain

Aug. 9/12

TAY SERIES PROPULSION SYSTEM SERVICE BULLETIN

ALERT TAY−72−A1772

Transmittal - Page 1 of 1

ALERT

1. Planning Information

A. Effectivity

(1) Fokker 70.

(a) Tay 620-15/20 Engines.

For engines which have the Low Pressure (LP) compressor rotor disc

assembly, P/N JR31198A or P/N JR34563A installed and this LP

compressor rotor disc assembly was formerly operated in Tay 650-15

or Tay 650-15/10 engines to the Plan D Flight Mission.

Modules M01100AA and M01100AB (LP Compressor Module).

(2) Fokker 100.

(a) Tay 620-15 Engines.

For engines which have the Low Pressure (LP) compressor rotor disc

assembly, P/N JR31198A or P/N JR34563A installed and this LP

compressor rotor disc assembly was formerly operated in Tay 650-15

or Tay 650-15/10 engines to the Plan D Flight Mission.

Modules M01100AA and M01100AB (LP Compressor Module).

(b) Tay 650-15 and Tay 650-15/10 Engines.

For engines which have the Low Pressure (LP) compressor rotor disc

assembly, P/N JR31198A or P/N JR34563A installed and this LP

compressor rotor disc assembly was formerly operated to the Plan D

Flight Mission or currently operates to the Plan D Flight Mission.

Modules M01300AA and M01300AB (LP Compressor Module).

B. Concurrent Requirements

None.

ENGINE - LOW PRESSURE (LP) COMPRESSOR ROTOR DISC - DECREASE OF THE MAXIMUM APPROVED

LIFE (DECLARED SAFE CYCLIC LIFE) OF THE LP COMPRESSOR ROTOR DISC ASSEMBLY FOR

OPERATION IN TAY650-15 OR TAY650-15/10 ENGINES TO THE PLAN D FLIGHT MISSION -

NON-MODIFICATION SERVICE BULLETIN

Printed in Great Britain

TAY−72−A1772

Page 1 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
C. Reason

The maximum approved life (declared safe cyclic life) of the Low Pressure (LP)

compressor rotor disc assemblies, P/N JR31198A and P/N JR34563A for operation

in Tay 650-15 or Tay 650-15/10 engines to the Plan D Flight Mission has been

re-calculated to a lower life.

D. Description

This Non-Modification Service Bulletin gives a decreased maximum approved life

(declared safe cyclic life) for the LP compressor rotor disc assemblies, P/N

JR31198A and P/N JR34563A for operation in Tay 650-15 or Tay 650-15/10 engines

to the Plan D Flight Mission.

This decrease in maximum approved life (declared safe cyclic life) must be

also considered by all Operators of Tay 620-15 and Tay 620-15/20 engines and

Tay 650-15 and Tay 650-15/10 engines, if the LP compressor rotor disc

assemblies, P/N JR31198A or P/N JR34563A was formerly operated in Tay 650-15

or Tay 650-15/10 engines to the Plan D Flight Mission.

This Non-Modification Service Bulletin supersedes the maximum approved life

(declared safe cyclic life) of the LP compressor rotor disc assemblies, P/N

JR31198A and P/N JR34563A currently given in the Tay 650-15 and Tay 650-15/10

engine Time Limits Manual, Chapter 05-10-01 for operation to the Plan D Flight

Mission. The decreased maximum approved life (declared safe cyclic life) will

be reflected in a later revision of the Tay 650-15 and Tay 650-15/10 engine

Time Limits Manual in Chapter 05-10-01.

E. Compliance

ALERT

This Non-Modification Service Bulletin must be accomplished on the affected

engines within 30 days after receipt of this Non-Modification Service

Bulletin.

F. Approval

The technical content of this document is approved under the authority of EASA

Design Organisation Approval No. EASA.21J.065.

Printed in Great Britain

TAY−72−A1772

Page 2 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
G. Manpower

Estimated Man-hours:

(1) In Service

Applicable (Hours not affected).

(2) At Overhaul/Shop Visit

Applicable (Hours not affected).

H. Material Price and Availability

Not applicable.

I. Tooling Price and Availability

New tools are not required.

J. Industry Support Information

None.

K. Weight and Balance

(1) Weight Change

None.

(2) Moment Arm

No effect.

(3) Datum

ES2540 (PPS100).

L. Electrical Load Data

The aircraft electrical load is not affected by this Non-Modification Service

Bulletin.

M. Software Accomplishment Summary

Not applicable.

Printed in Great Britain

TAY−72−A1772

Page 3 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
N. References

For Tay 620-15 and Tay 620-15/20 Engines:

(1) Time Limits Manual - T-TAY-2RR, Chapter 05-10-01.

For Tay 650-15 and Tay 650-15/10 Engines:

(1) Time Limits Manual - T-TAY-3RR, Chapter 05-10-01.

(2) Service Bulletin TAY-72-1356

ENGINE - L.P. COMPRESSOR ROTOR DISC - INTRODUCTION OF IMPROVED BALANCING

OF DISC AND FAN ASSEMBLIES

O. Other Publications Affected

For Tay 650-15 and Tay 650-15/10 Engines:

(1) Time Limits Manual - T-TAY-3RR, Chapter 05-10-01.

P. Interchangeability of Parts

Not affected.

Printed in Great Britain

TAY−72−A1772

Page 4 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
2. Material Information

A. Parts to be Replaced

None.

B. Expendable Parts

None.

C. Instruction/Disposition Codes

None.

Printed in Great Britain

TAY−72−A1772

Page 5 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
3. Accomplishment Instruction

For Tay 620-15 and Tay 620-15/20 Engines:

A. Correct the consumed life for the Low Pressure (LP) compressor rotor disc

assemblies, P/N JR31198A or P/N JR34563A, which were formerly operated in Tay

650-15 or Tay 650-15/10 engines to the Plan D Flight Mission in accordance

with the Time Limits Manual, Chapter 05-10-01, TASK 05-10-01-800-000 and step

B. of this Non-Modification Service Bulletin.

B. The maximum approved life (declared safe cyclic life) of the LP compressor

rotor disc assemblies, P/N JR31198A or P/N JR34563A, which were formerly

operated in Tay 650-15 or Tay 650-15/10 engines to the Plan D Flight Mission

need to be corrected from 20000 flight cycles to 18700 flight cycles.

CAUTION: THE LP COMPRESSOR ROTOR DISC ASSEMBLIES, P/N JR31198A AND P/N JR34563A

ARE COMMON TO VARIOUS MARKS OF THE TAY ENGINE. INTERCHANGE OF LP

COMPRESSOR ROTOR DISC ASSEMBLIES BETWEEN DIFFERENT MARKS OF THE TAY

ENGINE IS PERMISSIBLE. HOWEVER, THE REMAINING SERVICE LIFE OF THAT LP

COMPRESSOR ROTOR DISC ASSEMBLY WILL BE THE LIFE RELATED WITH THE LOWEST

DECLARED LIFE OF THAT LP COMPRESSOR ROTOR DISC ASSEMBLY ON EITHER

ENGINE MARK.

NOTE: A check of the life consumption in accordance with this

Non-Modification Service Bulletin is not necessary, if the LP

compressor rotor disc assembly has never been operated in Tay 650-15 or

Tay 650-15/10 engines to the Plan D Flight Mission.

NOTE: No LP compressor rotor disc assembly is permitted to have a life

consumption in excess of its maximum approved life (declared safe

cyclic life).

C. Record the new calculated consumed life, based on the new maximum approved

life (declared safe cyclic life) for operation in 650-15 or Tay 650-15/10

engines to the Plan D Flight Mission, in the applicable lifing documentation.

D. Record the new calculated consumed life, based on the new maximum approved

life (declared safe cyclic life) for operation in 650-15 or Tay 650-15/10

engines to the Plan D Flight Mission, in the release documentation (for

overhaul facilities only).

E. A record of accomplishment is required. Rolls-Royce Deutschland suggests to

put an entry into the engine log book.

Printed in Great Britain

TAY−72−A1772

Page 6 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
For Tay 650-15 and Tay 650-15/10 Engines:

F. Consider the new maximum approved life (declared safe cyclic life) for the Low

Pressure (LP) compressor rotor disc assemblies, P/N JR31198A or P/N JR34563A,

which currently operate to the Plan D Flight Mission and correct the consumed

life of these LP compressor rotor disc assemblies in accordance with the Time

Limits Manual, Chapter 05-10-01, TASK 05-10-01-800-000 and step H. of this

Non-Modification Service Bulletin.

G. Correct the consumed life for the LP compressor rotor disc assemblies, P/N

JR31198A or P/N JR34563A, which were formerly operated to the Plan D Flight

Mission in accordance with the Time Limits Manual, Chapter 05-10-01, TASK

05-10-01-800-000 and step H. of this Non-Modification Service Bulletin.

H. The new maximum approved life (declared safe cyclic life) of the LP compressor

rotor disc assembly for operation to the Plan D Flight Mission is listed in

the table below:

Part Identification Part Number Plan D Flight

Mission

Old maximum

approved lives

(flight cycles)

Plan D Flight

Mission

New maximum

approved lives

(flight cycles)

LP compressor rotor

disc assembly

(72-31-11, 01-100)

Pre Service Bulletin

TAY-72-1356 standard

JR31198A 20000 18700

LP compressor rotor

disc assembly

(72-31-11, 01-100)

Service Bulletin

TAY-72-1356 standard

JR34563A 20000 18700

CAUTION: THE LP COMPRESSOR ROTOR DISC ASSEMBLIES, P/N JR31198A AND P/N JR34563A

ARE COMMON TO VARIOUS MARKS OF THE TAY ENGINE. INTERCHANGE OF LP

COMPRESSOR ROTOR DISC ASSEMBLIES BETWEEN DIFFERENT MARKS OF THE TAY

ENGINE IS PERMISSIBLE. HOWEVER, THE REMAINING SERVICE LIFE OF THAT LP

COMPRESSOR ROTOR DISC ASSEMBLY WILL BE THE LIFE RELATED WITH THE LOWEST

DECLARED LIFE OF THAT LP COMPRESSOR ROTOR DISC ASSEMBLY ON EITHER

ENGINE MARK.

NOTE: A check of the life consumption in accordance with this

Non-Modification Service Bulletin is not necessary, if the LP

compressor rotor disc assembly has never been operated to the Plan D

Flight Mission.

NOTE: No LP compressor rotor disc assembly is permitted to have a life

consumption in excess of its new maximum approved life (declared safe

cyclic life).

Printed in Great Britain

TAY−72−A1772

Page 7 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
I. Record the new calculated consumed life, based on the new maximum approved

life (declared safe cyclic life) for operation to the Plan D Flight Mission

given in the table above, in the applicable lifing documentation.

J. Record the new calculated consumed life based on the new maximum approved life

(declared safe cyclic life) for operation to the Plan D Flight Mission given

in the table above in the release documentation (for overhaul facilities

only).

K. A record of accomplishment is required. Rolls-Royce Deutschland suggests to

put an entry into the engine log book.

Printed in Great Britain

TAY−72−A1772

Page 8 of 8

Aug. 9/12

Aug. 9/12 Initial Issue
 

 SERVICE BULLETIN FEEDBACK FORM

Aug. 9/12

Initial Issue

© Rolls-Royce Deutschland Ltd & Co KG

TAY-72-A1772

Page 1 of 1

Printed in Great Britain

Please use this form to give feedback on the quality of this Service Bulletin. The input you provide will be used to 

analyse areas of improvement and to take action to further improvement on the quality of our Service Bulletins. 

We thank you for the time you spent in completing this form. 

Please rate on a scale of 1 to 5, with 5 being the highest score: 

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If you have had difficulties to perform this Service Bulletin please quote below the area(s) and give a short 

description of the issue: 

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Please send the completed Service Bulletin Feedback Form to Rolls-Royce Deutschland, Service Bulletin Group. 

Email: mailto:RRD.SERVICE.BULLETINS@ROLLS-ROYCE.COM 

Planning Information

Section:

Material Information

Section:

Accomplishment Instruction

Section:

  1.A.  1.I.  2.A.  General

  1.B.  1.J.  2.B.  Get Access

  1.C.  1.K.  2.C.  Removal/Installation

  1.D.  1.L.  2.D.  Inspection

  1.E.  1.M.  2.E.  Test

  1.F.  1.N.  2.F.  Close the Access

  1.G.  1.O.  Log Book Entry

  1.H  1.P. 

Explanatory notes: