3. Job Set-up
__________
Subtask 72-23-00-941-085
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.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 72-23-00-010-108
B. Get Access
(1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
(2) Put the access platform in position.
4. Procedure
_________ R (Ref. Fig. 608/TASK 72-23-00-991-321) Subtask 72-23-00-210-063
A. Visual Inspection of the PS12 Line CAUTION : USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO
_______ HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.
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(1) Inspect the PS12 line as follows:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Inspect the hose for:
- broken hose braid 3 broken wires per
plait, and no more than
6 broken wires per
assembly, or per lineal
12 in. (305 mm) of hose.
- crimps Not serviceable Replace the PS12 line (Ref. TASK 72-23-00-000-040) and (Ref. TASK 72-23-00-400-040).
Subtask 72-23-00-210-061
B. Visual Inspection of the PS12 Line
CAUTION : USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO
_______ HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.
(1) Inspect the PS12 hose connections as follows:
(a) Cut and remove the lockwires.
(b) Disconnect the PS12 hose from the ECU and from the fan frame bosses.
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(c) Inspect the connections as follows:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Fitting nuts for:
- damaged corners Any amount, provided
proper torque can be
obtained.
- damaged threads Any amount, provided Chase the threads.
effective threads are
not reduced by more than
one after chasing.
- safetywire hole Serviceable, provided
deformation and metal around hole is not
wear. cracked or torn.
2. Fittings seating surfaces for:
- circumferential Any amount not
scratches detectable with a 0.04
in. (1 mm) radius ball
scribe.
- axial scratches Not serviceable Replace the hose or the part.
- nicks, pits Not serviceable Replace the hose or the part.
(2) Clean the weep holes with white spirit (Material No. CP2010) and plastic wire. 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
