W DOC AIRBUS | AMM A320F

Removal of the Trim Air Valve

TASK 21-63-51-000-001-A
Removal of the Trim Air Valve

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.
WARNING: MAKE SURE THAT THE COMPONENTS OF THE BLEED AIR SYSTEM ARE COOL. HOT COMPONENTS WILL BURN YOU.
CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.
NOTE: The procedure is the same for trim air valves 11HK (12HK and 13HK).
FIN: 11HK
FIN: 12HK
FIN: 13HK
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
No specific
1
WARNING NOTICE(S)
FOR [11HK] (TRIM VALVE CKPT)
No specific
AR
CAP - BLANKING
FOR [12HK] (TRIM VALVE FWD CAB)
No specific
AR
CAP - BLANKING
FOR [13HK] (TRIM VALVE AFT CAB)
No specific
AR
CAP - BLANKING
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
191CB, 191DB, 825
 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 06-41-53-00
FUSELAGE-DESCRIPTION AND OPERATION
F Trim Air Valve ** ON A/C NOT FOR ALL
F Trim Air Valve ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 21-63-51-861-050-A
A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 21-63-51-865-050-A
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/TEMP CTL/SYS 1 CHAN B/28VDC52HHD08
** ON A/C NOT FOR ALL
122VUAIR COND/ZONE TEMP CTL/28VDC/SYS24HKV20
122VUAIR COND/ZONE TEMP CTL/28VDC/SYS13HKV19
122VUAIR COND/ZONE TEMP CTL/115VAC/SYS22HKV18
122VUAIR COND/ZONE TEMP CTL/115VAC/SYS11HKV17
** 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 1/CHAN A/115VAC49HHX22
122VUAIR COND/TEMP CTL SYS 1/CHAN A/28VDC51HHX21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/28VDC56HHY21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/115VAC54HHY20
122VUAIR COND/TEMP CTL SYS 1/CHAN B/115VAC50HHY18
Subtask 21-63-51-941-050-A
C. Safety Precautions
   (1) In the cockpit, on AIR COND panel 30VU:
     (a) Make sure that the APU BLEED pushbutton switch is released (the OFF legend is on).
     (b) Make sure that the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).
     (c) Make sure that the PACK 1 and the PACK 2 pushbutton switches are released (the OFF legends are on).
     (d) Make sure that the HOT AIR pushbutton switch is released (the OFF legend is on).
     (e) Put the WARNING NOTICE(S) in position to tell persons not to operate these pushbutton switches.
   (2) At access doors 191CB and 191DB:
     (a) On the LP and the HP ground connectors, put the WARNING NOTICE(S) in position to tell persons not to supply the ground air.
Subtask 21-63-51-010-050-A
D. Get Access
   (1) Open the Fwd cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
   (2) Put the ACCESS PLATFORM 2M (6 FT) in position at the Fwd cargo-compartment door 825
   (3) Remove the access panels at partition FR34 (Ref. AMM D/O 06-41-53-00), (Ref. AMM TASK 25-54-12-000-001).
4. Procedure
Subtask 21-63-51-020-050-B
A. Removal of the Trim Air Valve
   (1) FOR [11HK] (TRIM VALVE CKPT)
     (a) Disconnect the electrical connector (9).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove and discard the cable-ties (1) and remove the insulation (10).
     (d) Remove the nut (12), the washer (13), the screw (19), the washer (20) and disconnect the bonding strap (21).
     (e) Remove the clamp (22) and move the duct assembly (11) upwards and away from the trim air valve (8).
     (f) Remove the O-ring (15).
     (g) Remove the clamp (14), the trim air valve (8) and the O-ring (15).
     (h) Put blanking plugs on the open ends of the duct flange (17), the trim air valve (8) and the duct assembly (11).
   (2) FOR [12HK] (TRIM VALVE FWD CAB)
     (a) Disconnect the electrical connector (7).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove and discard the cable-ties (1) and remove the insulation (3).
     (d) Remove the nut (12), the washer (13), the screw (19), the washer (20) and disconnect the bonding strap (21).
     (e) Remove the clamp (22) and move the duct assembly (11) up and away from the trim air valve (6).
     (f) Remove the O-ring (15).
     (g) Remove the clamp (14), the trim air valve (6) and the O-ring (15).
     (h) Put blanking plugs on the open ends of the duct flange (16), the trim air valve (6) and the duct assembly (11).
   (3) FOR [13HK] (TRIM VALVE AFT CAB)
     (a) Disconnect the electrical connector (5).
     (b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
     (c) Remove and discard the cable-ties (1) and remove the insulation (2).
     (d) Remove the nut (12), the washer (13), the screw (19), the washer (20) and disconnect the bonding strap (21).
     (e) Remove the clamp (22) and move the duct assembly (11) up and away from the trim air valve (4).
     (f) Remove the O-ring (15).
     (g) Remove the clamp (14), the trim air valve (4) and the O-ring (15).
     (h) Put blanking plugs on the open ends of the duct flange (18), the trim air valve (4) and the duct assembly (11).
[Rev.10 from 2021] 2026.04.02 06:11:44 UTC
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