DOC AIRBUS | AMM A320FInstallation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve
TASK 21-26-55-400-001-B
Installation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve
1. Reason for the Job
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 21-26-55-420-054-B
Subtask 21-26-55-410-057-A
[Rev.10 from 2021]
2026.04.02 06:11:09 UTC
Installation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 128 | REAR AVIONIC COMPARTMENT |
| 128EG, 824 |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 16 | O-RING | AIPC 21-26-01-17-020 |
| 16 | O-RING | AIPC 21-26-81-17-050 |
| 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 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 52-41-00-410-002-A | Close the Avionics Compartment Doors after Access |
| TASK 53-12-13-000-001-A | Removal of the avionics compartment floor panels |
| TASK 53-12-13-400-001-A | Installation of the avionics compartment floor panels |
Skin Exchanger Inlet Bypass 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 21-26-55-860-051-A A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
Subtask 21-26-55-010-058-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) - ADJUSTABLE is in position at the access door 824.
(2) Make sure that the access door 824 is open.
(3) Make sure that the access panel 128EG is removed (Ref. AMM TASK 53-12-13-000-001).
Subtask 21-26-55-865-061-A (1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 824.
(2) Make sure that the access door 824 is open.
(3) Make sure that the access panel 128EG is removed (Ref. AMM TASK 53-12-13-000-001).
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 21-26-55-210-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
D. Visual Inspection
(1) Make sure that the clamps, the flexible sleeve and the valve are in good condition; replace if necessary.
4. Procedure(1) Make sure that the clamps, the flexible sleeve and the valve are in good condition; replace if necessary.
Subtask 21-26-55-420-054-B
A. Installation of the Skin Exchanger Inlet Bypass Valve
(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Install the flexible sleeve (12) on the duct (10).
(3) Put the new AIPC 21-26-01-17-020 O-RING (16) or AIPC 21-26-81-17-050 O-RING (16) in the groove of the duct (18).
(4) Install the valve (15) in the flexible sleeve (12).
(6) Install the clamp (17) and tighten to the torque value which is indicated on the clamp.
(7) Put the flexible sleeve (12) in position.
(8) Install and tighten the clamps (11) and (13).
(10) Make sure that all the electrical connections are clean and in the correct condition.
(11) Connect the electrical connector (14).
Subtask 21-26-55-865-062-A (1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Install the flexible sleeve (12) on the duct (10).
(3) Put the new AIPC 21-26-01-17-020 O-RING (16) or AIPC 21-26-81-17-050 O-RING (16) in the groove of the duct (18).
(4) Install the valve (15) in the flexible sleeve (12).
NOTE: The arrow that indicates the air flow points to the rear.
(5) Make sure that the valve (15) is in the correct angular position. The electrical cable must not be too tight or too loose. (6) Install the clamp (17) and tighten to the torque value which is indicated on the clamp.
(7) Put the flexible sleeve (12) in position.
(8) Install and tighten the clamps (11) and (13).
NOTE: Use the clamps (11) and (13) kept during the removal procedure.
(9) Remove the CAP-BLANKING from each electrical connector and receptacle.(10) Make sure that all the electrical connections are clean and in the correct condition.
(11) Connect the electrical connector (14).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-26-55-710-054-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
C. Do this Test
(1) Do an operational test of the ventilation system of the avionics equipment (Ref. AMM TASK 21-26-00-710-001).
5. Close-up(1) Do an operational test of the ventilation system of the avionics equipment (Ref. AMM TASK 21-26-00-710-001).
NOTE: As an alternative procedure, you can do this operational test without the CFDS.
Subtask 21-26-55-410-057-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 128EG (Ref. AMM TASK 53-12-13-400-001).
(3) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(4) Remove the access platform(s).
Subtask 21-26-55-862-058-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 128EG (Ref. AMM TASK 53-12-13-400-001).
(3) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(4) Remove the access platform(s).