W DOC AIRBUS | AMM A320F

Inspection/Check of the PS12 line [CFMB]

TASK 72-23-00-280-002-A
Inspection/Check of the PS12 line

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
AR
WARNING NOTICE(S)
No specific
AR
WIRE - PLASTIC
No specific
Torque wrench: range to between 150 and 135 lbf.in (1.70 and 1.53 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.CP2010)
white spirit
(Material No.CP2011)
stoddard solvent
(Material No.CP8001)
lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)
lockwire 0.032 in. (0.8 mm) dia
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
437AL, 438AR, 447AL, 448AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 71-13-00-010-040-B
Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B
Closing of the Fan Cowl Doors
TASK 72-23-00-000-040-A
Removal of the PS12 Line
TASK 72-23-00-400-040-A
Installation of the PS12 Line
F PS12 Line
3. Job Set-up
Subtask 72-23-00-941-085-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) On the center pedestal, on the ENG panel 115VU:
     (a) Put a WARNING NOTICE(S) 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(S) to tell persons not to energize the FADEC 1(2).
Subtask 72-23-00-010-108-A ** ON A/C NOT FOR ALL
B. Get Access
   (1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
   (2) FOR [1000EM2] (ENGINE-2)
437AL 438AR
   (3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
   (4) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
4. Procedure
Subtask 72-23-00-210-063-A ** ON A/C NOT FOR ALL
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.
   (1) Inspect the PS12 line as follows:
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
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. AMM TASK 72-23-00-000-040) and (Ref. AMM TASK 72-23-00-400-040).
Subtask 72-23-00-210-061-A ** ON A/C NOT FOR ALL
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.
     (c) Inspect the connections as follows:
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Fitting nuts for:


  • damaged corners
Any amount, provided proper torque can be obtained.

  • damaged threads
Any amount, provided effective threads are not reduced by more than one after chasing.
Chase the threads.
  • safetywire hole deformation and wear.
Serviceable, provided metal around hole is not cracked or torn.

2.Fittings seating surfaces for:


  • circumferential scratches
Any amount not 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 WIRE - PLASTIC.
   (3) Blow clean dry air into the PS12 connection to ECU to remove any dirt or water accumulation. Blocked hose is not serviceable. If necessary, replace the hose (Ref. AMM TASK 72-23-00-000-040) and (Ref. AMM TASK 72-23-00-400-040).
   (4) Check the ECU nipple for dirt. If necessary, remove the dirt with WIRE - PLASTIC. Take care to not introduce dirt inside the ECU.
   (5) Check the fan frame bosses for dirt. If necessary, remove the dirt with stoddard solvent (Material No.CP2011) and a plastic wire. Blow clean dry air into the fan frame bosses nipples.
   (6) Lubricate the ECU and the fan frame bosses nipples with engine fuel.
   (7) Connect the PS12 line to the ECU and to the fan frame bosses.
   (8) TORQUE the PS12 connections to between 150 and 135 lbf.in (1.70 and 1.53 m.daN ) T.
   (9) Safety with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
5. Close-up
Subtask 72-23-00-410-098-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
     (a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
     (b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
   (3) Remove the access platform(s).
   (4) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 02:41:52 UTC
"Aviabrain" 2025