DOC AIRBUS | AMM A320FInstallation of the Air Inlet Check Valve
TASK 21-26-56-400-001-A
Installation of the Air Inlet Check Valve
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 21-26-56-420-050-C
Subtask 21-26-56-410-050-A
[Rev.10 from 2021]
2026.04.02 06:48:03 UTC
Installation of the Air Inlet Check Valve
FIN: 2150HM
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 824 |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 2 | O-RING | AIPC 21-26-01-03-050 |
| 2 | O-RING | AIPC 21-26-01-27-050 |
| 2 | O-RING | AIPC 21-26-81-03-050 |
| 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 21-26-43-400-003-A | Installation of the Filter Assembly |
| TASK 21-26-43-400-006-A | Installation of the Filter Assembly |
| 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 Inlet Check-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 21-26-56-860-050-A A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
Subtask 21-26-56-010-051-A (1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
B. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position below access door 824.
(2) Make sure that access door 824 is open (Ref. AMM TASK 52-41-00-010-002).
Subtask 21-26-56-865-051-A (1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position below access door 824.
(2) Make sure that access door 824 is open (Ref. AMM TASK 52-41-00-010-002).
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
| 122VU | AIR COND/AVNCS/VENT/MONG | 3HQ | Y17 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AE02 |
| ** ON A/C ALL | |||
| 123VU | AVNCS VENT/BLOWER/FAN | 1HQ | AD10 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AC04 |
Subtask 21-26-56-420-050-C
A. Installation of the Air Inlet Check-Valve
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG - BLANKING from the disconnected line ends.
(4) Install the check valve (4).
(a) Make sure that the flaps of the check valve open inboard.
(5) Align the attachment holes and install the screws (6) and the washers (5).
(7) Install the clamp (3).
(8) Make sure that the assembly (1) is in the correct position.
(9) TORQUE the clamp (3) to the torque value given on the clamp.
Subtask 21-26-56-865-052-A (1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG - BLANKING from the disconnected line ends.
(4) Install the check valve (4).
(a) Make sure that the flaps of the check valve open inboard.
(5) Align the attachment holes and install the screws (6) and the washers (5).
NOTE: The interval between the attachment holes is not the same. This is to make sure that the check valve is in one of the correct angular positions when the holes are aligned.
(6) Install the filter assembly (1) with the new AIPC 21-26-01-03-050 O-RING (2) or AIPC 21-26-01-27-050 O-RING (2) or AIPC 21-26-81-03-050 O-RING (2) (Ref. AMM TASK 21-26-43-400-006) or (Ref. AMM TASK 21-26-43-400-003). (7) Install the clamp (3).
(8) Make sure that the assembly (1) is in the correct position.
(9) TORQUE the clamp (3) to the torque value given on the clamp.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-26-56-710-050-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 |
| 122VU | AIR COND/AVNCS/VENT/MONG | 3HQ | Y17 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AE02 |
| ** ON A/C ALL | |||
| 123VU | AVNCS VENT/BLOWER/FAN | 1HQ | AD10 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AC04 |
C. Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 21-26-00-710-001).
5. Close-upSubtask 21-26-56-410-050-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 21-26-56-862-051-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).