DOC AIRBUS | AMM A320FDeactivation of the Skin Air Inlet Valve
TASK 21-26-00-040-004-A
Deactivation of the Skin Air Inlet Valve
1. Reason for the Job
MMEL 21-26-05A
AVIONICS SKIN AIR 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 21-26-00-861-063-A
Subtask 21-26-00-040-054-B
Subtask 21-26-00-410-076-A
[Rev.10 from 2021]
2026.04.02 06:10:58 UTC
Deactivation of the Skin Air Inlet Valve
1. Reason for the Job
MMEL 21-26-05A
AVIONICS SKIN AIR 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 | ACCESS PLATFORM 3M (10 FT) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 127 | REAR AVIONIC COMPARTMENT |
| 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 |
Skin Air-Inlet ValveSubtask 21-26-00-861-063-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 21-26-00-865-098-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 21-26-00-010-077-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT) in position on the left side of the aircraft below the valve 15HQ.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(3) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).
4. Procedure(1) Put an ACCESS PLATFORM 3M (10 FT) in position on the left side of the aircraft below the valve 15HQ.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(3) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).
Subtask 21-26-00-040-054-B
A. Closing Procedure of the Skin Air-Inlet Valve
(a) Push the PUSH latch to release the handle.
(b) Before you turn the handle, push it in the direction of the valve to disengage the clutch mechanism.
(c) Turn the handle to get access to the deactivation switch.
(d) Set the deactivation switch to OFF.
(e) Pull the handle to engage the clutch mechanism.
(f) Turn the handle counterclockwise to fully close the flap.
(g) Stow and latch the handle.
Subtask 21-26-00-865-117-A CAUTION:
DO NOT USE FORCE TO TURN THE HANDLE. THERE ARE SHEAR PINS IN THE HANDLE. IF YOU APPLY FORCE TO THE HANDLE WHEN THE FLAP IS IN THE FULLY OPEN OR CLOSED POSITION, THE SHEAR PINS WILL BREAK.
(1) On skin air-inlet valve 15HQ: (a) Push the PUSH latch to release the handle.
(b) Before you turn the handle, push it in the direction of the valve to disengage the clutch mechanism.
(c) Turn the handle to get access to the deactivation switch.
(d) Set the deactivation switch to OFF.
(e) Pull the handle to engage the clutch mechanism.
(f) Turn the handle counterclockwise to fully close the flap.
(g) Stow and latch the handle.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-26-00-710-088-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
C. Operational Test
(a) The VENT AVNCS-SYS FAULT warning comes into view:
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 Multipurpose Control and Display Unit (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 skin air-inlet valve (15HQ). If other messages are shown, refer to the related MMEL valve item.
(2) On the VENTILATION section of overhead panel 22VU: - Release the EXTRACT pushbutton switch (the OVRD legend comes on).
- Make sure that the conditioned-air inlet valve (21HQ) is open (the position indicator of the valve is at 0).
(a) The VENT AVNCS-SYS FAULT warning comes into view:
- Ignore this warning.
- Push the CLR key.
Subtask 21-26-00-410-076-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 21-26-00-941-063-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. Aircraft Maintenance Configuration
(1) Put a WARNING NOTICE(S) in the cockpit to tell the crew that the valve is disconnected.
(2) Make an entry in the logbook.
Subtask 21-26-00-862-063-A (1) Put a WARNING NOTICE(S) in the cockpit to tell the crew that the valve is disconnected.
(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).