W DOC AIRBUS | AMM A320F

Removal of the Pack Downstream Check-Valves

TASK 21-52-43-000-001-A
Removal of the Pack Downstream Check-Valves

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
CAUTION: YOU MUST CLOSE THE CARGO COMPARTMENT DOORS BEFORE THE WIND SPEED IS MORE THAN 65 KNOTS TO PREVENT DAMAGE TO THE DOOR OR TO THE AIRCRAFT STRUCTURE.
CAUTION: WHEN YOU OPEN AND CLOSE THE CARGO DOORS, MAKE SURE THAT THE ACCESS PLATFORM IS AT THE CORRECT HEIGHT. IF IT IS TOO HIGH, IT WILL PREVENT FREE MOVEMENT OF THE DOORS.
FIN: 15HM
FIN: 16HM
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT)
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
FOR [15HM] (P1 CHECK VALVE DOWNSTREAM)
No specific
AR
COVER - PROTECTION
FOR [16HM] (P2 CHECK VALVE DOWNSTREAM)
No specific
AR
COVER - PROTECTION
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
825
FOR [15HM] (P1 CHECK VALVE DOWNSTREAM)
131PW, 191BB
FOR [16HM] (P2 CHECK VALVE DOWNSTREAM)
132PW, 192FB
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 25-54-12-000-001-A
Removal of the Forward Cargo-Compartment Partition
TASK 52-30-00-860-001-A
Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 53-35-13-000-002-A
Removal of the Quick-Release Access Panels from the Belly Fairing Structure
F Pack Downstream Check Valve 15HM (16HM) ** ON A/C NOT FOR ALL
F Pack Downstream Check Valve 15HM (16HM) ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 21-52-43-861-051-A
A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 21-52-43-865-050-A
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 15HM (P1 CHECK VALVE DOWNSTREAM)
49VUAIR COND/TEMP CTL/SYS 1 CHAN B/28VDC52HHD08
** ON A/C NOT FOR ALL
122VUAIR COND/PACK TEMP/CTL SYS1/1/115VAC1HHX22
122VUAIR COND/PACK TEMP/CTL SYS1/1/28VDC3HHX21
122VUAIR COND/PACK TEMP CTL SYS2/1/28VDC4HHY19
122VUAIR COND/PACK TEMP CTL SYS2/1/115VAC2HHY18
** ON A/C NOT FOR ALL
122VUAIR COND/TEMP CTL SYS 1/CHAN A/115VAC49HHX22
122VUAIR COND/TEMP CTL SYS 1/CHAN A/28VDC51HHX21
122VUAIR COND/TEMP CTL SYS 1/CHAN B/115VAC50HHY18
** ON A/C NOT FOR ALL
FOR FIN: 16HM (P2 CHECK VALVE DOWNSTREAM)
122VUAIR COND/PACK TEMP/CTL SYS1/2/115VAC21HHW22
122VUAIR COND/PACK TEMP/CTL SYS1/2/28VDC23HHW21
122VUAIR COND/PACK TEMP CTL SYS2/2/28VDC24HHY21
122VUAIR COND/PACK TEMP CTL SYS2/2/115VAC22HHY20
** ON A/C NOT FOR ALL
122VUAIR COND/TEMP CTL SYS 2/CHAN A/115VAC53HHW22
122VUAIR COND/TEMP CTL SYS 2/CHAN A/28VDC55HHW21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/28VDC56HHY21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/115VAC54HHY20
Subtask 21-52-43-010-050-A
C. Get Access
   (1) Put the ACCESS PLATFORM 2M (6 FT) at forward cargo-compartment door 825.
WARNING: DO NOT OPEN OR GO NEAR PRESSURE-SEALED DOORS WHEN THE AIRCRAFT IS PRESSURIZED. A PRESSURE-SEALED DOOR THAT OPENS WHEN THE AIRCRAFT IS PRESSURIZED:
  • WILL CAUSE EXPLOSIVE DECOMPRESSION.
  • CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAUSE DAMAGE TO THE AIRCRAFT OR EQUIPMENT.
   (2) Open forward cargo-compartment door 825
(Ref. AMM TASK 52-30-00-860-001).
   (3) Remove the access panels
(Ref. AMM TASK 53-35-13-000-002):

     (a) FOR [15HM] (P1 CHECK VALVE DOWNSTREAM)
     (b) FOR [16HM] (P2 CHECK VALVE DOWNSTREAM)
   (4) Remove the forward cargo-compartment partitions
(Ref. AMM TASK 25-54-12-000-001):

     (a) FOR [15HM] (P1 CHECK VALVE DOWNSTREAM)
     (b) FOR [16HM] (P2 CHECK VALVE DOWNSTREAM)
4. Procedure
Subtask 21-52-43-020-050-A
A. Removal of the Pack Downstream Check-Valve
NOTE: Two persons are necessary for this procedure.

   (1) Make sure that you have access from the inside and the outside of the aircraft.
   (2) Remove the pack downstream check-valves:
     (a) FOR [15HM] (P1 CHECK VALVE DOWNSTREAM)
       1 Remove the clamp (7) and carefully disconnect the flange (8).
       2 Remove the nut (12), the bolt (9) and the washer (10) and disconnect the bonding strap (11).
       3 Remove the clamp (2) and disconnect the bellows (1).
       4 Hold the pack downstream check-valve (6) and remove the bolts (3) and the washers (4).
       5 Remove the pack downstream check-valve (6) and the seal (5).
       6 Put a COVER - PROTECTION on the open ends of the pack downstream check-valve (6), the bellows (1) and the flange (8).
     (b) FOR [16HM] (P2 CHECK VALVE DOWNSTREAM)
       1 Remove the clamps (27) and (41).
       2 Remove the nut (34), the bolt (30) and the washer (31) and disconnect the bonding straps (32) and (33).
       3 Remove the nuts (37) and (40) and the washers (36) and (39).
       4 Hold the duct assembly (29) and remove the bolts (35) and (38).
       5 Disconnect the tie-rods (43) and (44) and safety them to the structure.
       6 Carefully disconnect the duct assembly (29) from the flange (42) and the pack downstream check-valve (26).
       7 Remove the duct assembly (29).
       8 Remove the packing (28).
       9 Put a COVER - PROTECTION on the open ends of the duct assembly (29), the pack downstream check-valve (26) and the flange (42).
       10 Remove the clamp (23) and carefully disconnect the bellow (21) from the pack downstream check-valve (26).
       11 Hold the pack downstream check-valve (26) and remove the bolts (24) and the washers (25).
       12 Remove the pack downstream check-valve (26) and the seal (5).
       13 Put a COVER - PROTECTION on the open ends of the pack downstream check-valve (26) and the bellows (21).
[Rev.10 from 2021] 2026.04.02 06:47:28 UTC
"WTRUIB" 2025