DOC AIRBUS | AMM A320FSkin Air-Inlet Valve Inoperative - Do the Reactivation of the Conditioned-Air Inlet Valve
TASK 21-26-00-440-802-A
Skin Air-Inlet Valve Inoperative - Do the Reactivation 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 21-26-00-440-069-B
Subtask 21-26-00-410-097-A
[Rev.10 from 2021]
2026.04.02 06:10:58 UTC
Skin Air-Inlet Valve Inoperative - Do the Reactivation of the Conditioned-Air Inlet Valve
ZONE: 127
1. Reason for the JobMMEL 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 2M (6 FT) - ADJUSTABLE |
| No specific | AR | ACCESS PLATFORM 3M (10 FT) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| 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 24-42-00-861-001-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 |
| 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 ValveCAUTION:
USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY ELECTRICITY BECAUSE THE AVIONICS VENTILATION SYSTEM IS NOT SERVICEABLE. IF YOU ENERGIZE THE AIRCRAFT ELECTRICAL CIRCUITS WITHOUT THE VENTILATION SYSTEM YOU WILL CAUSE DAMAGE TO ELECTRICAL EQUIPMENT.
Subtask 21-26-00-861-095-A Subtask 21-26-00-865-124-A B. Open, safety and tag this(these) circuit breaker(s):
Subtask 21-26-00-010-100-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 valve 15HQ.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at 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 valve 15HQ.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at access door 824.
(3) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).
Subtask 21-26-00-440-069-B
A. Reactivation of Skin Air-Inlet Valve 15HQ
(a) Get the electrical cable and its connector.
(b) Remove the CAP-BLANKING from each electrical connector and receptacle.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Connect electrical connector 21HQ-A to conditioned-air inlet valve 21HQ.
(e) Fully close conditioned-air inlet valve 21HQ with the manual mechanism (the position indicator of the valve goes to C).
(2) 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.
(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 21-26-00-865-125-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 conditioned-air inlet valve 21HQ: (a) Get the electrical cable and its connector.
(b) Remove the CAP-BLANKING from each electrical connector and receptacle.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Connect electrical connector 21HQ-A to conditioned-air inlet valve 21HQ.
(e) Fully close conditioned-air inlet valve 21HQ with the manual mechanism (the position indicator of the valve goes to C).
(2) 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.
WARNING:
DO NOT USE YOUR FINGERS TO SET THE DEACTIVATION SWITCH TO THE "ON" POSITION. USE A STICK, AND BE VERY CAREFUL. THE AVIONICS EQUIPMENT VENTILATION COMPUTER (AEVC) WILL POSSIBLY PUT THE VALVE 15HQ DIRECTLY IN THE CLOSED POSITION AND THE FLAP OF THE VALVE 15HQ WILL CUT YOUR FINGERS.
(d) Set the deactivation switch to ON. (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 21-26-00-710-093-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
(1) Do an operational check of the avionics equipment ventilation-system (Ref. AMM TASK 21-26-00-710-001).
5. Close-up(1) Do an operational check of the avionics equipment ventilation-system (Ref. AMM TASK 21-26-00-710-001).
Subtask 21-26-00-410-097-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).
(4) Remove the WARNING NOTICE(S).
Subtask 21-26-00-862-098-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).
(4) Remove the WARNING NOTICE(S).