DOC AIRBUS | AMM A320FDeactivation of the FWD Cargo Compartment-Heating Pressure-Regulating Valve
TASK 21-43-00-040-004-A
Deactivation of the FWD Cargo Compartment-Heating Pressure-Regulating Valve
MMEL 21-43-01C
FWD CARGO COMPARTMENT HEATING
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 21-43-00-861-065-A ** ON A/C NOT FOR ALL Subtask 21-43-00-010-061-A ** ON A/C NOT FOR ALL
Subtask 21-43-00-040-053-A ** ON A/C NOT FOR ALL
Subtask 21-43-00-410-060-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:11:18 UTC
Deactivation of the FWD Cargo Compartment-Heating Pressure-Regulating 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.
ZONE: 130
FIN: 14HK ** ON A/C NOT FOR ALL
Task Summary
1. Reason for the JobFIN: 14HK ** ON A/C NOT FOR ALL
Task Summary
| Access | Test | Specific Tools | Mhr | E/T | Nb Men |
|---|---|---|---|---|---|
| YES | NO | NO | 0.7 | 0.7 | 1 |
MMEL 21-43-01C
FWD CARGO COMPARTMENT HEATING
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 | CAP - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.14QFB1) | Wire-Locking Dia: 0.8 mm CRES Nickel Alloy - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 130 | FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX |
| 131PW, 825 |
| 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 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 25-54-12-000-001-A | Removal of the Forward Cargo-Compartment Partition |
| TASK 25-54-12-400-001-A | Installation 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 52-30-00-860-002-A | Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
FWD Trim-Air Pressure Regulating ValveSubtask 21-43-00-861-065-A ** ON A/C NOT FOR ALL Subtask 21-43-00-010-061-A ** ON A/C NOT FOR ALL
B. Get Access
(2) Put the ACCESS PLATFORM 2M (6 FT) at the FWD cargo-compartment door 825.
(3) Remove the access panel 131PW (Ref. AMM TASK 25-54-12-000-001).
Subtask 21-43-00-865-070-A ** ON A/C NOT FOR ALL 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:
(1) Open the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001). - WILL CAUSE EXPLOSIVE DECOMPRESSION.
- CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAUSE DAMAGE TO THE AIRCRAFT OR EQUIPMENT.
(2) Put the ACCESS PLATFORM 2M (6 FT) at the FWD cargo-compartment door 825.
(3) Remove the access panel 131PW (Ref. AMM TASK 25-54-12-000-001).
C. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/115VAC | 53HH | W22 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/28VDC | 55HH | W21 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/115VAC | 49HH | X22 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/28VDC | 51HH | X21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/28VDC | 56HH | Y21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/115VAC | 54HH | Y20 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN B/115VAC | 50HH | Y18 |
Subtask 21-43-00-040-053-A ** ON A/C NOT FOR ALL
A. Deactivation of the FWD Cargo Compartment-Heating Pressure-Regulating Valve
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Turn the manual lever (3) of the pressure-regulating valve (2) to the CLOSED position.
14QFB1 Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(5) Put a WARNING NOTICE(S) in the cockpit to tell the flight crew that the FWD cargo compartment-heating pressure-regulating valve is deactivated.
5. Close-upWARNING:
DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY
COOL TO PREVENT BURNS.
(1) Disconnect the electrical connector 14HK-A (1) from the pressure-regulating valve (2) and temporarily attach it to the aircraft structure. (2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Turn the manual lever (3) of the pressure-regulating valve (2) to the CLOSED position.
WARNING:
USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
(4) Safety the manual lever with (5) Put a WARNING NOTICE(S) in the cockpit to tell the flight crew that the FWD cargo compartment-heating pressure-regulating valve is deactivated.
Subtask 21-43-00-410-060-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 the access panel 131PW (Ref. AMM TASK 25-54-12-400-001).
(3) Remove the access platform(s).
(4) Close the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(5) Make an entry in the aircraft log book to record the deactivation.
Subtask 21-43-00-865-071-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 131PW (Ref. AMM TASK 25-54-12-400-001).
(3) Remove the access platform(s).
(4) Close the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(5) Make an entry in the aircraft log book to record the deactivation.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-43-00-862-064-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/115VAC | 53HH | W22 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/28VDC | 55HH | W21 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/115VAC | 49HH | X22 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/28VDC | 51HH | X21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/28VDC | 56HH | Y21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/115VAC | 54HH | Y20 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN B/115VAC | 50HH | Y18 |