DOC AIRBUS | AMM A320FSkin Air-Inlet Valve Inoperative - Do the Deactivation of the Conditioned-Air Inlet Valve
TASK 21-26-00-040-014-A
Skin Air-Inlet Valve Inoperative - Do the Deactivation of the Conditioned-Air Inlet Valve
MMEL 21-26-05B
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 21-26-00-861-090-A
Subtask 21-26-00-040-070-B
Subtask 21-26-00-410-091-A
[Rev.10 from 2021]
2026.04.02 06:10:58 UTC
Skin Air-Inlet Valve Inoperative - Do the Deactivation of the Conditioned-Air Inlet Valve
Task Summary
1. Reason for the Job| Access | Test | Specific Tools | Mhr | E/T | Nb Men |
|---|---|---|---|---|---|
| YES | NO | NO | 0.6 | 0.6 | 1 |
MMEL 21-26-05B
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 3M (10 FT)- ADJUSTABLE |
| No specific | AR | CAP - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| 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 |
Skin Air-Inlet ValveSubtask 21-26-00-861-090-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 21-26-00-865-104-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 21-26-00-869-118-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. If the ground horn is in operation:
Subtask 21-26-00-010-094-A - On the external-power panel 108VU:
Push the RESET pushbutton switch to stop the mechanical call horn.
D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position on the left side of the aircraft below the skin air-inlet valve 15HQ.
(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 824.
(3) Open the access door 824 (Ref. AMM TASK 52-41-00-010-002).
4. Procedure(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position on the left side of the aircraft below the skin air-inlet valve 15HQ.
(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 824.
(3) Open the access door 824 (Ref. AMM TASK 52-41-00-010-002).
Subtask 21-26-00-040-070-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 give 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.
(2) On the conditioned-air inlet valve 21HQ:
(a) Disconnect the connector 21HQ-A from the conditioned-air inlet valve 21HQ.
(b) Put CAP - BLANKING on the disconnected electrical connectors.
(c) Keep the electrical cable and its connector near the valve.
(d) Fully open the conditioned-air inlet valve 21HQ with the manual mechanism.
Subtask 21-26-00-865-108-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 the 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 give 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.
(2) On the conditioned-air inlet valve 21HQ:
(a) Disconnect the connector 21HQ-A from the conditioned-air inlet valve 21HQ.
(b) Put CAP - BLANKING on the disconnected electrical connectors.
(c) Keep the electrical cable and its connector near the valve.
(d) Fully open the conditioned-air inlet valve 21HQ with the manual mechanism.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-26-00-710-083-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) Make sure that all the fault messages shown are related to:
(a) The VENT AVNCS SYS FAULT warning comes into view. Ignore this warning.
(4) On the ECAM control panel:
Subtask 21-26-00-710-083-B CAUTION:
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 the operational test of the avionics equipment ventilation-system from the Multipurpose Control & Display Unit (MCDU) (Ref. AMM TASK 21-26-00-710-001):(a) Make sure that all the fault messages shown are related to:
- The fault of the skin air-inlet valve (15HQ)
- The deactivation of the conditioned-air inlet valve (21HQ).
NOTE: The BLOWER FAULT legend can come on but you can ignore it. If other messages are shown in the ECAM, you can refer to the related MMEL valve item.
(2) On the VENTILATION section of the overhead control and indicating panel 22VU: - Release the EXTRACT pushbutton switch (the OVRD legend comes on) in less than 20 seconds after the operational test.
NOTE: The BLOWER FAULT legend goes out of view.
(3) On the bottom part of the upper ECAM display-unit: (a) The VENT AVNCS SYS FAULT warning comes into view. Ignore this warning.
(4) On the ECAM control panel:
- Push the CLR key.
DELETED
5. Close-upSubtask 21-26-00-410-091-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).
Subtask 21-26-00-942-088-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).
B. Safety Precautions
(1) Make an entry in the logbook.
Subtask 21-26-00-862-093-A (1) 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).