DOC AIRBUS | AMM A320FDeactivation of the Conditioned-Air Inlet Valve
TASK 21-26-00-040-003-A
Deactivation of the Conditioned-Air Inlet Valve
MMEL 21-26-08A
AVIONICS AIR CONDITIONING INLET VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 21-26-00-861-061-A
Subtask 21-26-00-040-053-A
Subtask 21-26-00-410-058-A
[Rev.10 from 2021]
2026.04.02 06:10:58 UTC
Deactivation of the Conditioned-Air Inlet Valve
Task Summary
1. Reason for the Job| Access | Test | Specific Tools | Mhr | E/T | Nb Men |
|---|---|---|---|---|---|
| YES | YES | NO | 0.2 | 0.2 | 1 |
MMEL 21-26-08A
AVIONICS AIR CONDITIONING INLET VALVE
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 | CAP - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 824 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-26-00-710-001-A | Operational Check of the Avionics Equipment Ventilation-System via MCDU |
| TASK 21-26-00-710-001-A-01 | Operational Check of the Avionics Equipment Ventilation (without the CFDS) |
| 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 31-60-00-860-001-A | EIS Start Procedure |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
| TASK 52-41-00-010-002-A | Open the Avionics Compartment Doors for Access |
| TASK 52-41-00-410-002-A | Close the Avionics Compartment Doors after Access |
Air-Conditioned Inlet ValveSubtask 21-26-00-861-061-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
Subtask 21-26-00-865-064-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 21-26-00-010-057-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
C. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(2) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).
4. Procedure(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(2) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).
Subtask 21-26-00-040-053-A
A. Opening Procedure of the Conditioned-Air Inlet Valve
(1) On the conditioned-air inlet-valve 21HQ:
(a) Disconnect connector 21HQ-A from valve 21HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable and its connector near the valve.
(d) Fully open valve 21HQ with the manual mechanism.
(2) On the bottom part of the upper ECAM display unit:
(a) The VENT AVNCS SYS FAULT warning comes into view:
Subtask 21-26-00-865-120-A (1) On the conditioned-air inlet-valve 21HQ:
(a) Disconnect connector 21HQ-A from valve 21HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable and its connector near the valve.
(d) Fully open valve 21HQ with the manual mechanism.
(2) On the bottom part of the upper ECAM display unit:
(a) The VENT AVNCS SYS FAULT warning comes into view:
- Disregard this warning.
- push the CLR key.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-26-00-710-089-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
C. Operational Test
5. Close-upCAUTION:
AFTER THE DEACTIVATION OF THE APPLICABLE VALVE, MAKE SURE THAT YOU DO THE OPERATIONAL TEST OF THE AVIONICS-EQUIPMENT VENTILATION-SYSTEM BEFORE EACH FLIGHT.
(1) Do an operational test of the avionics equipment ventilation from the MCDU (Ref. AMM TASK 21-26-00-710-001). NOTE: Make sure that all the fault messages shown are related to the fault of the conditioned-air inlet valve (21HQ). If other messages are shown, refer to the related MMEL valve item.
Subtask 21-26-00-410-058-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).
Subtask 21-26-00-942-077-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).
B. Safety Precautions
(1) Put a WARNING NOTICE(S) in the cockpit to tell the crew that this valve is deactivated.
(2) Make an entry in the logbook.
Subtask 21-26-00-862-061-A (1) Put a WARNING NOTICE(S) in the cockpit to tell the crew that this valve is deactivated.
(2) Make an entry in the logbook.
C. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).