W DOC AIRBUS | AMM A320F

Reactivation of the APU Bleed Check-Valve

TASK 36-12-00-440-801-A
Reactivation of the APU Bleed Check-Valve

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
FIN: 7260HM ** ON A/C NOT FOR ALL
1. Reason for the Job
MMEL 36-22-03A
APU LEAK DETECTION LOOP
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in ) T
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
151CW
151SW, 197BB
197KB
 C. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
10
BLANKING CAP
AIPC 36-12-03-28-260
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 12-33-21-618-001-A-02
Pre-conditioning with the APU
TASK 36-22-17-000-001-A
Removal of the APU Overheat Sensing-Elements
TASK 36-22-17-400-001-A
Installation of the APU Overheat Sensing-Elements
TASK 52-30-00-860-001-A
Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A
Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
AIPC 36-12-03-28
F APU Bleed Check-Valve - Blanking Cap ** ON A/C NOT FOR ALL
F APU Bleed Check-Valve - Blanking Cap ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 36-12-00-860-097-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Put the WARNING NOTICE(S) in position:
  • In the cockpit, on engine control panel 115VU, to tell persons not to start the engine(s)
  • In the cockpit, on AIR COND overhead control panel 30VU, to tell persons not to push in the APU BLEED pushbutton switch
  • On the HP ground connector, to tell persons not to pressurize the pneumatic system.
Subtask 36-12-00-010-067-A ** ON A/C NOT FOR ALL
B. Get Access
   (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below access panel 197BB.
   (2) Remove access panel 197BB.
   (3) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
   (4) In the aft cargo compartment, remove the sidewall panel:
     (a) If installed, remove sidewall panel 151CW, or
     (b) If installed, remove sidewall panel 151SW.
Subtask 36-12-00-010-067-C ** ON A/C NOT FOR ALL
B. Get Access
   (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below access panel 197KB.
   (2) Remove access panel 197KB.
   (3) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
   (4) In the aft cargo compartment, remove sidewall panel 151CW.
Subtask 36-12-00-865-091-A ** ON A/C NOT FOR ALL
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR BLEED/X FEED/VALVE/BAT2HVD13
49VUAIR BLEED/ENG 1/CTL3HA1D12
49VUAIR BLEED/ENG 1/MONG2HA1D11
122VUAIR BLEED/ENG 2/CTL3HA2Z23
122VUAIR BLEED/ENG 2/MONG2HA2Z22
122VUAIR BLEED/X FEED VALVE/NORM1HVZ20
4. Procedure
Subtask 36-12-00-420-051-A ** ON A/C NOT FOR ALL
A. Reactivation of the APU Bleed Check-Valve
NOTE: Refer to AIPC 36-12-03-28 for the AIPC 36-12-03-28-260 BLANKING CAP (10) of the APU bleed check-valve (6) to do the procedure.
   (1) Disengage the overheat sensing elements that are near the APU bleed check-valve (6) from the ducts (9) and (4) (Ref. AMM TASK 36-22-17-000-001).
   (2) Loosen the nut of the clamp (3) and remove the clamp (3).
   (3) Loosen the nut of the clamp (8) and remove the clamp (8).
   (4) Remove the nuts (2) and the washers (1).
   (5) Hold the blanking cap (10) and remove the bolts (7).
   (6) Remove the blanking cap (10) and the seal (5).
   (7) Put the APU bleed check-valve (6) with the seal (5) in position.
   (8) Install the bolts (7), washers (1) and nuts (2).
   (9) Tighten the nuts (2).
   (10) Install the clamps (3) and (8).
   (11) TORQUE the nuts of the clamps (3) and (8) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in ) T.
   (12) Attach the overheat sensing elements that are near the APU bleed check-valve (6) to the ducts (9) and (4) (Ref. AMM TASK 36-22-17-400-001).
Subtask 36-12-00-865-092-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR BLEED/X FEED/VALVE/BAT2HVD13
49VUAIR BLEED/ENG 1/CTL3HA1D12
49VUAIR BLEED/ENG 1/MONG2HA1D11
122VUAIR BLEED/ENG 2/CTL3HA2Z23
122VUAIR BLEED/ENG 2/MONG2HA2Z22
122VUAIR BLEED/X FEED VALVE/NORM1HVZ20
Subtask 36-12-00-710-063-A ** ON A/C NOT FOR ALL
C. Leak Test of the Pneumatic Connections
   (1) Do the ground air pre-conditioning with the APU (Ref. AMM TASK 12-33-21-618-001).
   (2) Make sure that there are no leaks between the connections of the APU bleed check-valve (6) and the ducts (4) and (9).
5. Close-up
Subtask 36-12-00-410-067-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) Install access panel 197BB.
   (3) In the aft cargo compartment, install the sidewall panel:
     (a) If removed, install sidewall panel 151CW, or
     (b) If removed, install sidewall panel 151SW.
   (4) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
Subtask 36-12-00-410-067-C ** 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) Install access panel 197KB.
   (3) In the aft cargo compartment, install sidewall panel 151CW.
   (4) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
Subtask 36-12-00-860-099-A ** ON A/C NOT FOR ALL
B. Aircraft Maintenance Configuration
   (1) Put the aircraft back to the serviceable condition.
   (2) Remove the WARNING NOTICE(S).
   (3) Remove the access platform(s).
[Rev.10 from 2021] 2026.04.01 12:39:15 UTC
"Aviabrain" 2025