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.
　
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