(6) TORQUE the self locking borescope cap assemblies to between 50 and 55 lbf.in (0.56 and 0.62 m.daN).
NOTE : To achieve the correct installation of the self locking
____ borescope cap assembly, the slot of its ring must be positioned on the borescope boss lug at the final tightening.
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END OF SB CFMI 72-0376
5. Close-up
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Subtask 72-54-00-410-073
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the thrust reverser cowl doors (Ref. TASK 78-36-00-410-040): FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR
Subtask 72-54-00-440-059
B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
Subtask 72-54-00-410-079
C. Close Access
(1) Close the fan cowl doors (Ref. TASK 71-13-00-410-040):
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(2) Remove the warning notice(s).
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Optional Visual Inspection of the Stage 4 Blades from the Rear of the Engine
1. Reason for the Job
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To do a direct, hands-on, visual inspection of the stage 4 LPT blades. During the borescope inspection of this blade stage (Ref. TASK 72-54-00-290-00600), on some rare occasions, you may see blades with their tip shroud shingled or unlatched, or with radial mismatches/out-of-flush defects or with gaps at their interlocks. This inspection is not mandatory since the Limit Extensions (Ref. TASK 72-00-00-200-02500) referred to in the borescope inspection of the stage 4 blades give the specific time/cycles of operation with these defects. However, it makes sense to prevent a further deterioration of the turbine stage, before the expiration of the permitted limit extensions. Therefore, a visual inspection is recommended as soon as possible after the finding of these defects, if the aircraft maintenance schedule permits. The benefits of this visual inspection are that you can:
- put back some blades that are shingled/unlatched in the correct interlock positions
- make a more accurate measurement of the mismatch (at the blade tip shrouds) than the estimate you can make from the borescope inspection
- better see gaps, or areas of the blade interlocks that do not touch each other (the gaps are the result of the deterioration of the blade pretwist (angle) characteristic)
- make an evaluation of the correct blade pretwist characteristic through a simple manual method.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific warning notice
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B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors 71-13-00-410-040 Closing of the Fan Cowl Doors 78-11-11-000-041 Removal of the Core Nozzle Assembly 78-11-11-400-041 Installation of the Core Nozzle Assembly 78-11-12-000-041 Removal of the Centerbody 78-11-12-400-041 Installation of the Centerbody 78-30-00-081-041 Make the Thrust Reverser Serviceable after
Maintenance 78-30-00-481-041 Make the Thrust Reverser Unserviceable for
Maintenance 78-36-00-010-040 Opening of the Thrust Reverser Doors 78-36-00-410-040 Closing of the Thrust Reverser Doors 72-54-00-991-303 Fig. 604
3. Job Set-up
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Subtask 72-54-00-941-063
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM ENGINE 发动机 2(91)
