DOC AIRBUS | AMM A320FInstallation of the Extract and Blower Fans
TASK 21-26-51-400-001-A
Installation of the Extract and Blower Fans
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 21-26-51-420-050-B
Subtask 21-26-51-410-050-A
[Rev.10 from 2021]
2026.04.02 06:11:07 UTC
Installation of the Extract and Blower Fans
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 |
| 824 |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | O-RING | AIPC 21-26-01-08-030 |
| 3 | O-RING | AIPC 21-26-81-08-050 |
| 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 21-26-51-710-001-A | Operational Test of the Extract and Blower Fans (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 |
Extract FanCAUTION:
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 21-26-51-860-050-A A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001)
Subtask 21-26-51-865-051-A (1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001)
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 21-26-51-010-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| FOR FIN: 18HQ (FANEXTRACT, AVNCS VENT) | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AE02 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AC04 |
| ** ON A/C ALL | |||
| FOR FIN: 20HQ (FANBLOWER, AVNCS VENT) | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
| 123VU | AVNCS VENT/BLOWER/FAN | 1HQ | AD10 |
C. 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.
4. Procedure(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.
Subtask 21-26-51-420-050-B
A. Installation of the Extract and Blower Fans
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Install the flexible sleeve (8) on the pipe (10).
(4) Install the new AIPC 21-26-01-08-030 O-RING (3) or AIPC 21-26-81-08-050 O-RING (3) in the fan (5) groove.
(5) Install the fan (5) in the flexible sleeve (8).
For FIN 18HQ, the arrow which shows the airflow direction points down.
For FIN 20HQ, the arrow which shows the airflow direction points to the aircraft right side.
(6) Install the clamps (6). Do not fully tighten at this time.
(7) Make sure that the fan (5) is in the correct angular position. The electrical cable must not be too tight or too loose.
(8) Make sure that the O-ring (3) is correctly installed in the fan groove.
(9) Install the clamp (2) and torque them to the value given on the clamp.
(10) Put the flexible sleeve (8) in position.
(11) Install the clamps (7) and (9) and tighten them.
(13) Remove the CAP-BLANKING from each electrical connector and receptacle.
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (4).
Subtask 21-26-51-865-052-A (1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Install the flexible sleeve (8) on the pipe (10).
(4) Install the new AIPC 21-26-01-08-030 O-RING (3) or AIPC 21-26-81-08-050 O-RING (3) in the fan (5) groove.
(5) Install the fan (5) in the flexible sleeve (8).
For FIN 18HQ, the arrow which shows the airflow direction points down.
For FIN 20HQ, the arrow which shows the airflow direction points to the aircraft right side.
(6) Install the clamps (6). Do not fully tighten at this time.
(7) Make sure that the fan (5) is in the correct angular position. The electrical cable must not be too tight or too loose.
(8) Make sure that the O-ring (3) is correctly installed in the fan groove.
(9) Install the clamp (2) and torque them to the value given on the clamp.
(10) Put the flexible sleeve (8) in position.
(11) Install the clamps (7) and (9) and tighten them.
NOTE: Use the clamps (7) and (9) kept during the removal procedure.
(12) Tighten the clamps (6) to the value given on the clamps. (13) Remove the CAP-BLANKING from each electrical connector and receptacle.
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (4).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-26-51-710-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| FOR FIN: 18HQ (FANEXTRACT, AVNCS VENT) | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AE02 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AC04 |
| ** ON A/C ALL | |||
| FOR FIN: 20HQ (FANBLOWER, AVNCS VENT) | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
| 123VU | AVNCS VENT/BLOWER/FAN | 1HQ | AD10 |
C. Do an operational test of the ventilation system of the avionics equipment (Ref. AMM TASK 21-26-00-710-001).
5. Close-upNOTE: As an alternative procedure, you can do this operational test without the CFDS (Ref. AMM TASK 21-26-51-710-001).
Subtask 21-26-51-410-050-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 21-26-51-862-051-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).