DOC AIRBUS | AMM A320FConfiguration of the Avionics Compartment Ventilation System
TASK 21-26-00-860-001-A
Configuration of the Avionics Compartment Ventilation System
1. Reason for the Job
To have a good flow of air in the avionics compartment when the aircraft is in flight configuration. This is to do all the maintenance procedures when the external temperature is more than 12 deg.C (53.60 deg.F).
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 21-26-00-861-067-A Subtask 21-26-00-941-100-A
Subtask 21-26-00-040-057-A
(1) On the skin air outlet-valve (22HQ)
(a) If the skin air outlet-valve (type A) is installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Fold out the handle.
4 Set the deactivation switch to OFF.
5 Turn the handle counterclockwise to fully open the main flap.
6 Fold, stow and latch the handle.
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Set the deactivation switch to OFF.
4 Turn the handle clockwise to fully open the main flap.
5 Stow and latch the handle.
(a) If the skin air inlet-valve (type A) is installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Fold out the handle.
4 Set the deactivation switch to OFF.
5 Turn the handle clockwise to fully open the flap.
6 Fold, stow and latch the handle.
(b) If the skin air inlet-valve (Type B) is installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Set the deactivation switch to OFF.
4 Turn the handle clockwise to fully open the flap.
5 Stow and latch the handle.
(3) On the skin-exchanger isolation valve (24HQ):
(a) Disconnect the connector 24HQ-A from the valve 24HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable with its connector near the valve and attach them with an TAPE - ADHESIVE.
(d) Turn the manual mechanism of the valve (24HQ) to the closed position.
(4) On the skin-exchanger outlet bypass-valve (23HQ):
(a) Disconnect the connector 23HQ-A from the valve 23HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable with its connector near the valve and attach them with an TAPE - ADHESIVE.
(d) Turn the manual mechanism of the valve (23HQ) to the closed position.
(5) On the skin-exchanger inlet bypass-valve (16HQ):
(a) Disconnect the connector 16HQ-A from the valve 16HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable with its connector near the valve and attach them with an TAPE - ADHESIVE.
(d) Turn the manual mechanism of the valve (16HQ) to the closed position.
Subtask 21-26-00-440-057-A
Subtask 21-26-00-410-068-A
[Rev.10 from 2021]
2026.03.31 23:01:29 UTC
Configuration of the Avionics Compartment Ventilation System
1. Reason for the Job
To have a good flow of air in the avionics compartment when the aircraft is in flight configuration. This is to do all the maintenance procedures when the external temperature is more than 12 deg.C (53.60 deg.F).
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 | TAPE - ADHESIVE |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 812, 822, 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 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
Deactivation of the ValvesSubtask 21-26-00-861-067-A Subtask 21-26-00-941-100-A
B. Safety Precautions
(1) In the cockpit, on the center pedestal, set the throttle control lever of engines 1 and 2 in the TO/GA position (TAKEOFF mode).
Subtask 21-26-00-010-067-A (1) In the cockpit, on the center pedestal, set the throttle control lever of engines 1 and 2 in the TO/GA position (TAKEOFF mode).
C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access doors 812, 822 and 824.
(2) Open the access doors 812, 822 and 824.
4. Procedure(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access doors 812, 822 and 824.
(2) Open the access doors 812, 822 and 824.
Subtask 21-26-00-040-057-A
WARNING:
DO NOT USE YOUR FINGERS TO SET THE DEACTIVATION SWITCHES TO THE "ON" POSITION. USE A STICK, AND BE VERY CAREFUL.
THE AVIONICS EQUIPMENT VENTILATION COMPUTER (AEVC) WILL POSSIBLY PUT VALVES 22HQ AND 15HQ DIRECTLY IN THE CLOSED POSITION AND THE FLAPS OF THE VALVES WILL CUT YOUR FINGERS.
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.
A. Deactivation of the Valves NOTE: It is possible that the measurement of the skin temperature is different from the Outside Air Temperature (OAT).
Thus, it is possible that the skin air outlet-valves are in the open position and the OAT is lower than 12 deg.C (53.60 deg.F) (at the same time).
In this condition, the valves can stay in the open position.
When the aircraft is in the ground configuration with an Outside Air Temperature (OAT) more than 12 deg.C (53.60 deg.F), do these operations : Thus, it is possible that the skin air outlet-valves are in the open position and the OAT is lower than 12 deg.C (53.60 deg.F) (at the same time).
In this condition, the valves can stay in the open position.
(1) On the skin air outlet-valve (22HQ)
(a) If the skin air outlet-valve (type A) is installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Fold out the handle.
4 Set the deactivation switch to OFF.
5 Turn the handle counterclockwise to fully open the main flap.
6 Fold, stow and latch the handle.
NOTE: When the main flap is open, the internal flap is closed.
(b) If the skin air outlet-valve (Type B) is installed: 1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Set the deactivation switch to OFF.
4 Turn the handle clockwise to fully open the main flap.
5 Stow and latch the handle.
NOTE: When the internal flap is open, if you continue to turn the handle clockwise, you will also open the main flap.
(2) On the skin air inlet-valve (15HQ) (a) If the skin air inlet-valve (type A) is installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Fold out the handle.
4 Set the deactivation switch to OFF.
5 Turn the handle clockwise to fully open the flap.
6 Fold, stow and latch the handle.
(b) If the skin air inlet-valve (Type B) is installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Set the deactivation switch to OFF.
4 Turn the handle clockwise to fully open the flap.
5 Stow and latch the handle.
(3) On the skin-exchanger isolation valve (24HQ):
(a) Disconnect the connector 24HQ-A from the valve 24HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable with its connector near the valve and attach them with an TAPE - ADHESIVE.
(d) Turn the manual mechanism of the valve (24HQ) to the closed position.
(4) On the skin-exchanger outlet bypass-valve (23HQ):
(a) Disconnect the connector 23HQ-A from the valve 23HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable with its connector near the valve and attach them with an TAPE - ADHESIVE.
(d) Turn the manual mechanism of the valve (23HQ) to the closed position.
(5) On the skin-exchanger inlet bypass-valve (16HQ):
(a) Disconnect the connector 16HQ-A from the valve 16HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Keep the electrical cable with its connector near the valve and attach them with an TAPE - ADHESIVE.
(d) Turn the manual mechanism of the valve (16HQ) to the closed position.
NOTE: Because the horn is not serviceable in flight, BLOWER and EXTRACT pushbutton switches must be in AUTO configuration (pushed, with the FAULT and the OVRD legends off).
Ignore the warnings not related to the system.
Ignore the warnings not related to the system.
B. Reactivation of the Valves
When the aircraft is in the ground configuration, do these operations :
(1) On the skin-exchanger isolation valve (24HQ) and skin-exchanger inlet and outlet bypass-valves (16HQ and 23HQ) :
(a) Connect the connectors 16HQ-A, 23HQ-A and 24HQ-A to the valves 16HQ, 23HQ and 24HQ.
(a) If the skin air-inlet and air-outlet valves (type A) are installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle.
3 Fold out the handle.
4 Set the deactivation switch to ON.
5 Close and latch the handle.
1 Push the PUSH latch to release the handle.
2 Pull the handle.
3 Set the deactivation switch to ON.
4 Stow and latch the handle.
(d) On the VENTILATION section of the overhead panel 22VU, make sure that the EXTRACT pushbutton switch is in the OVRD configuration (released, with the OVRD legend on).
Subtask 21-26-00-710-064-A 5. Close-upWhen the aircraft is in the ground configuration, do these operations :
(1) On the skin-exchanger isolation valve (24HQ) and skin-exchanger inlet and outlet bypass-valves (16HQ and 23HQ) :
(a) Connect the connectors 16HQ-A, 23HQ-A and 24HQ-A to the valves 16HQ, 23HQ and 24HQ.
WARNING:
DO NOT USE YOUR FINGERS TO SET THE DEACTIVATION SWITCHES TO THE "ON" POSITION. USE A STICK, AND BE VERY CAREFUL.
THE AVIONICS EQUIPMENT VENTILATION COMPUTER (AEVC) WILL POSSIBLY PUT VALVES 22HQ AND 15HQ DIRECTLY IN THE CLOSED POSITION AND THE FLAPS OF THE VALVES WILL CUT YOUR FINGERS.
(2) On the skin air-inlet and air-outlet valves (15HQ, 22HQ) (a) If the skin air-inlet and air-outlet valves (type A) are installed:
1 Push the PUSH latch to release the handle.
2 Pull the handle.
3 Fold out the handle.
4 Set the deactivation switch to ON.
5 Close and latch the handle.
NOTE: It is necessary to operate the aircraft electrical power-supply with avionics ventilation system in normal configuration in these limits:
(b) If the skin air-inlet and air-outlet valves (type B) are installed: - when the OAT is less than or equal to 49 deg.C (120.20 deg.F): no limit,
- when the OAT is between 49 deg.C (120.20 deg.F) and 55 deg.C (131 deg.F):
2 hours, - when the OAT is between 55 deg.C (131 deg.F) and 60 deg.C (140 deg.F): 1 hour,
- when the OAT is equal to or more than 60 deg.C (140 deg.F): 30 minutes.
1 Push the PUSH latch to release the handle.
2 Pull the handle.
3 Set the deactivation switch to ON.
4 Stow and latch the handle.
NOTE: It is necessary to operate the aircraft electrical power-supply with avionics ventilation system in normal configuration in these limits:
(c) On the AIR COND panel 30VU, make sure that the FAULT and OFF legends of the PACK 1(2) pushbutton switch are off. - when the OAT is less than or equal to 49 deg.C (120.20 deg.F): no limit,
- when the OAT is between 49 deg.C (120.20 deg.F) and 55 deg.C (131 deg.F): 2 hours,
- when the OAT is between 55 deg.C (131 deg.F) and 60 deg.C (140 deg.F) : 1 hour,
- when the OAT is equal to or more than 60 deg.C (140 deg.F): 30 minutes.
(d) On the VENTILATION section of the overhead panel 22VU, make sure that the EXTRACT pushbutton switch is in the OVRD configuration (released, with the OVRD legend on).
Subtask 21-26-00-410-068-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 812, 822 and 824.
(3) Remove the access platform(s).
Subtask 21-26-00-860-072-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 812, 822 and 824.
(3) Remove the access platform(s).
B. Put the aircraft back to its initial configuration.
(1) In the cockpit, on the center pedestal, set the throttle control lever of engines 1 and 2 in the IDLE stop position (0 degree TLA).
Subtask 21-26-00-862-067-A (1) In the cockpit, on the center pedestal, set the throttle control lever of engines 1 and 2 in the IDLE stop position (0 degree TLA).