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

ALERT

1. Planning Information

A. Effectivity

R (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

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 1
E. 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.

R 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

I. Tooling Price and Availability

New tools are not required.

J. Industry Support Information

R None.

Printed in Great Britain

TAY−75−A1784

Page 2 of 9

Feb.14/13

May 30/13 Revision 1
K. Weight and Balance

(1) Weight Change

None.

(2) Moment Arm

No effect.

(3) Datum

R 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.

N. References

R For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines:

R and 75-32-30. (1) Aircraft Maintenance Manual, Chapters 71

(2) Non-Modification Service Bulletin TAY-75-1655

AIR - AIR CONTROL REGULATOR AND ACTUATOR - INSPECTION OF THE AIRFLOW

CONTROL SYSTEM - NON-MODIFICATION SERVICE BULLETIN

R For Tay 651-54 Engines:

R (1) Engine Maintenance Manual - M-TAY-5RR, Chapters 71 and 75-32-30.

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 1
2. Material Information

R 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 Old

R Part

R No.

R Instructions/

R Dispositions

R 75-32-31

R K11404 R $ 0.40 R 1 Washer R 01-103 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 1
3. 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,

R Chapter 71).

Printed in Great Britain

TAY−75−A1784

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Feb.14/13

May 30/13 Revision 1
C. Remove the HP air bleed valve push-rod from the HP air bleed valve operating

R lever

CAUTION: DO NOT ADJUST SETTING OF THE HP AIR BLEED VALVE PUSH-ROD.

R (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines:

Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK

75-32-30-000-814.

R

R

R (2) For Tay 651-54 Engines:

Refer to the Engine Maintenance Manual, Chapter 75-32-30, TASK

75-32-30-000-000.

R

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:

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

R (a) If the torque necessary to open and close the HP air bleed valve is:

[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

R (2) For Tay 651-54 Engines:

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
R (a) If the torque necessary to open and close the HP air bleed valve is:

[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

R the step D. again to decrease the torque and do

R (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines:

Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK

75-32-30-700-815.

R

R

R (2) For Tay 651-54 Engines:

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

R lever

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.

R (1) For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines:

Refer to the Aircraft Maintenance Manual, Chapter 75-32-30, TASK

75-32-30-400-814.

R

R

R (2) For Tay 651-54 Engines:

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

R Manual, Chapter 71).

Printed in Great Britain

TAY−75−A1784

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Feb.14/13

May 30/13 Revision 1
R and send it to Rolls-Royce I. Complete the Accomplishment Form on page 9

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 1
Accomplishment Form

Printed in Great Britain

TAY−75−A1784

Page 9 of 9

Feb.14/13

May 30/13 Revision 1

 

 SERVICE BULLETIN FEEDBACK FORM

May 30/13

Revision 1

© Rolls-Royce Deutschland Ltd & Co KG

TAY-72-A1784

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:

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

- Quality rating of the Accomplishment Instructions  1  2  3  4  5

- 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 perform this Service Bulletin please quote below the area(s) and give a short 

description of the issue:

Operator: Overhaul Site:

Name/Title: Date:

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: