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 

# ALERT1. 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 IssueC. 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 IssueG. 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 IssueN. 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 Issue2. 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 Issue3. 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 IssueFor 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 IssueI. 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

# S ERVICE BULLETIN FEEDBACK FORM

Aug

. 9 / 12 In itial Issue © Rolls

- Royce Deutschland Ltd & Co KG TAY

- 72

- A1772 Page 1 of 1 Printed in Great Britain 

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### 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: