This document transmits Revision 1 of Non-Modification Service Bulletin TAY-75-A1784. Document History Non-Modification Service Bulletin Revision Status Initial Issue Feb.14/13 Non-Modification Service Bulletin Revision 1
Remove Incorporate Reason for change All pages of the Non-Modification Service Bulletin. Pages 1 to 9 of the Non-Modification Service Bulletin. To extend the Effectivity of the Non-Modification Service Bulletin to include the Tay 620-15, Tay 620-15/20 and Tay 651-54 engines and to include some minor editorial changes.**Printed in Great Britain** May 30/13

TAY SERIES PROPULSION SYSTEM SERVICE BULLETIN



# ALERT TAY−75−A1784 Transmittal - Page 1 of 1 

# ALERT1. Planning Information A. Effectivity (1) Fokker 70. R All Tay 620-15/20 Engines. R Non-Modular R (2) Fokker 100. R (a) All Tay 620-15 Engines. R Non-Modular R (b) All Tay 650-15 and Tay 650-15/10 Engines. R Non-Modular R (3) Boeing 727. R All Tay 651-54 Engines. R Non-Modular R B. Concurrent Requirements
None.
C. Reason Deterioration of the High Pressure (HP) air bleed valve operating mechanism has an effect on the Low Pressure (LP) compressor (fan) rotor aerodynamics and may also have an effect on the LP compressor (fan) rotor stability. Revision 1 of this Non-Modification Service Bulletin has been issued to extend the Effectivity of the Non-Modification Service Bulletin to include the Tay 620-15, Tay 620-15/20 and Tay 651-54 engines and to include some minor editorial changes. R R R R D. Description This Non-Modification Service Bulletin instructs an inspection of the HP air bleed valve operating mechanism. AIR - AIR CONTROL REGULATOR AND ACTUATOR - INSPECTION OF THE HIGH PRESSURE (HP) AIR BLEED VALVE OPERATING MECHANISM - NON-MODIFICATION SERVICE BULLETIN**Printed in Great Britain**



# TAY−75−A1784 Page 1 of 9 Feb.14/13 May 30/13 Revision 1E. Compliance
ALERT This Non-Modification Service Bulletin must be accomplished on all engines within 1500 cycles 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. G. Manpower (1) In Service 10 hours. (2) At Overhaul/Shop Visit Not applicable. H. Material Price and Availability R A modification kit is not required; parts are supplied as single line items. R For actual prices and availability of spares, contact: R Rolls-Royce plc R Customer Account Manager R Spares Support Group R Derby R Great Britain R I. Tooling Price and Availability New tools are not required. J. Industry Support Information
None. R**Printed in Great Britain**



# TAY−75−A1784 Page 2 of 9 Feb.14/13 May 30/13 Revision 1K. Weight and Balance (1) Weight Change
None. (2) Moment Arm No effect. (3) Datum ES2540 (PPS100). R L. Electrical Load Data The aircraft electrical load is not affected by this Non-Modification Service Bulletin. M. Software Accomplishment Summary Not applicable. N. References For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines: R (1) Aircraft Maintenance Manual, Chapters 71 R and 75-32-30. (2) Non-Modification Service Bulletin TAY-75-1655
AIR - AIR CONTROL REGULATOR AND ACTUATOR - INSPECTION OF THE AIRFLOW CONTROL SYSTEM - NON-MODIFICATION SERVICE BULLETIN For Tay 651-54 Engines: R (1) Engine Maintenance Manual - M-TAY-5RR, Chapters 71 and 75-32-30. R O. Other Publications Affected
None. P. Interchangeability of Parts Not affected.**Printed in Great Britain**



# TAY−75−A1784 Page 3 of 9 Feb.14/13 May 30/13 Revision 12. Material Information A. Parts to be Replaced R
IPC R Fig/Item R No. R New R Part R No. R Unit Price R (US R Dollars) R Qty R Per R Eng. R Key Word R Old Part R No. R Instructions/ R Dispositions R

75-32-31 R 01-103 R K11404 R $ 0.40 R 1 Washer R K11404 (1) B. Expendable Parts Refer to the related Manual tasks given in the Accomplishment Instruction of this Non-Modification Service Bulletin. C. Instruction/Disposition Codes (1) It is necessary to replace the used part with the a new part during accomplishment of this Non-Modification Service Bulletin.**Printed in Great Britain**



# TAY−75−A1784 Page 4 of 9 Feb.14/13 May 30/13 Revision 13. Accomplishment Instruction A. General
NOTE : In order to reduce the potential for multiple-engine in-flight shutdown, power loss, or other anomaly due to maintenance error, Rolls-Royce Deutschland recommends that Operators avoid performing maintenance on multiple engines installed on the same aircraft at the same time. If it is not possible to avoid maintenance on more than one engine of an aircraft at the same time, Rolls-Royce Deutschland recommends that additional controls are applied in order to ensure that maintenance tasks have been completed as defined.
WARNING : YOU MUST BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE IS STOPPED. THE ENGINE PARTS CAN STAY HOT FOR ALMOST ONE HOUR.
WARNING : DO NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY. IF YOU GET AN INJURY, PUT IT IN COLD WATER FOR TEN MINUTES AND GET MEDICAL AID.
CAUTION : THE AIRCRAFT MAINTENANCE MANUAL TASK FOR THE REMOVAL OF THE HIGH PRESSURE (HP) AIR BLEED VALVE PUSH-ROD REFERENCED IN THIS NON-MODIFICATION SERVICE BULLETIN DETAILS A REQUIREMENT TO PERFORM AN ENGINE TEST. IF THE HP AIR BLEED VALVE PUSH-ROD HAS NOT BEEN REPLACED OR ADJUSTED, IT IS NOT NECESSARY TO PERFORM THE ENGINE TEST. (1) Obey all the WARNINGS and CAUTIONS in the procedures that are referred to. (2) Consumable Materials (a) Refer to the related Manual tasks given in this instruction. (3) Tools and Equipment (a) Refer to the related Manual tasks given in this instruction. B. Get access to the High Pressure (HP) air bleed valve operating mechanism (1) Open the applicable cowl doors (Refer to the Aircraft Maintenance Manual, Chapter 71). R**Printed in Great Britain**



# TAY−75−A1784 Page 5 of 9 Feb.14/13 May 30/13 Revision 1C. Remove the HP air bleed valve push-rod from the HP air bleed valve operating lever R
CAUTION : DO NOT ADJUST SETTING OF THE HP AIR BLEED VALVE PUSH-ROD. (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines: R Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-000-814. R R (2) For Tay 651-54 Engines: R Refer to the Engine Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-000-000. R R D. Measure the torque necessary to open and close the HP air bleed valve R (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines: R Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-700-815. R R
NOTE : The torque necessary to open and close the HP air bleed valve before and after application of lubricant, must be recorded on the Accomplishment Form on page 9 and returned to Rolls-Royce Deutschland, Service Engineering. R R R R (a) If the torque necessary to open and close the HP air bleed valve is: R [1] More than 14,69 Nm (130 lbf in.) to close and more than 22,6 Nm (200 lbf in.) to open, continue with step E. R R [a] If the torque necessary to open and close the HP air bleed valve is still more than 14,69 Nm (130 lbf in.) to close and still more than 22,6 Nm (200 lbf in.) to open after two times performing of step E., accomplish the Non-Modification Service Bulletin TAY-75-1655. R R R R R [2] Less than 14,69 Nm (130 lbf in.) to close and less than 22,6 Nm (200 lbf in.) to open, continue with step F. R R (2) For Tay 651-54 Engines: R Refer to the Engine Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-700-000. R R
NOTE : The torque necessary to open and close the HP air bleed valve before and after application of lubricant, must be recorded on the Accomplishment Form on page 9 and returned to Rolls-Royce Deutschland, Service Engineering. R R R R**Printed in Great Britain**



# TAY−75−A1784 Page 6 of 9 Feb.14/13 May 30/13 Revision 1(a) If the torque necessary to open and close the HP air bleed valve is: R [1] More than 14,69 Nm (130 lbf in.) to close and more than 22,6 Nm (200 lbf in.) to open, continue with step E. R R [a] If the torque necessary to open and close the HP air bleed valve is still more than 14,69 Nm (130 lbf in.) to close and still more than 22,6 Nm (200 lbf in.) to open after two times performing of step E., contact Rolls-Royce Deutschland, Service Engineering. R R R R R [2] Less than 14,69 Nm (130 lbf in.) to close and less than 22,6 Nm (200 lbf in.) to open, continue with step F. R R E. Apply the applicable lubricant to the HP air bleed valve operating mechanism to decrease the torque and do R the step D. again (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines: R Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-700-815. R R (2) For Tay 651-54 Engines: R Refer to the Engine Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-700-000. R R F. Install the HP air bleed valve push-rod on the HP air bleed valve operating lever R
CAUTION : IF THE HP AIR BLEED VALVE PUSH-ROD NEEDS TO BE ADJUSTED OR REPLACED, THE COMPLETION OF THE WHOLE REFERENCED AIRCRAFT MAINTENANCE MANUAL TASK IS NECESSARY, INCLUDING ADJUSTMENTS AND ENGINE TEST. (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines: R Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-400-814. R R (2) For Tay 651-54 Engines: R Refer to the Engine Maintenance Manual, Chapter 75-32-30, TASK 75-32-30-400-000. R R G. Make sure that the work area is clean and clear of tools, equipment and other unwanted materials. H. Close the access to the HP air bleed valve operating mechanism (1) Close the applicable cowl doors (Refer to the Aircraft Maintenance Manual, Chapter 71). R**Printed in Great Britain**



# TAY−75−A1784 Page 7 of 9 Feb.14/13 May 30/13 Revision 1I. Complete the Accomplishment Form on page 9 R and send it to Rolls-Royce Deutschland, Service Engineering. J. A record of accomplishment is required. Rolls-Royce Deutschland suggests to put an entry into the engine log book.**Printed in Great Britain**



# TAY−75−A1784 Page 8 of 9 Feb.14/13 May 30/13 Revision 1Accomplishment Form**Printed in Great Britain**



# TAY−75−A1784 Page 9 of 9 Feb.14/13 May 30/13 Revision 1

# S ERVICE BULLETIN FEEDBACK FORM

May 3 0 /13 Revision 1 © Rolls

- Royce Deutschland Ltd & Co KG TAY

- 72

- A 1 7 8 4 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 tim e you spent in completing this form. Please rate on a scale of 1 to 5, with 5 being the highest score:

- General quality rating of this Service Bulletin  1  2  3  4  5

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- Quality rating of the Illustration  1  2  3  4  5

- Is this Service Bulletin easy to understand ?  Yes  No If you have had difficulties to per form 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
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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: