DOC AIRBUS | AMM A320FInspection of the Air Inlet Flap Backlash
TASK 21-61-51-200-002-A
Inspection of the Air Inlet Flap Backlash
This procedure is optional. It is to assist in early detection of possible excessive wear in the ram-air inlet flap offset mechanism system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 21-61-51-861-056-A Subtask 21-61-51-865-067-A
Subtask 21-61-51-220-051-A
Subtask 21-61-51-865-068-A
[Rev.10 from 2021]
2026.04.02 06:11:40 UTC
Inspection of the Air Inlet Flap Backlash
WARNING:
MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
NOTE: The procedure is the same for the left and the right air inlet flap.
1. Reason for the JobThis procedure is optional. It is to assist in early detection of possible excessive wear in the ram-air inlet flap offset mechanism system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-61-00-300-001-A | Attachment and Linkage Components - Repair/Replacement |
| TASK 21-61-51-000-003-A | Removal of the Air-Inlet Flap Mechanism |
| TASK 21-61-51-200-003-A | Air-Inlet Flap Mechanism - In-Service Wear Limits |
| TASK 21-61-51-400-003-A | Installation of the Air-Inlet Flap Mechanism |
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
Inspection Measurement LocationSubtask 21-61-51-861-056-A Subtask 21-61-51-865-067-A
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 21-61-51-941-056-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 8HH (P1 RAM AIR IN ACTUATOR) | |||
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/115VAC | 1HH | X22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/28VDC | 3HH | X21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/28VDC | 4HH | Y19 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/115VAC | 2HH | Y18 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/115VAC | 49HH | X22 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/28VDC | 51HH | X21 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN B/115VAC | 50HH | Y18 |
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 28HH (P2 RAM AIR IN ACTUATOR) | |||
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/115VAC | 21HH | W22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/28VDC | 23HH | W21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/28VDC | 24HH | Y21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/115VAC | 22HH | Y20 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/115VAC | 53HH | W22 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/28VDC | 55HH | W21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/28VDC | 56HH | Y21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/115VAC | 54HH | Y20 |
C. Safety Precautions
(1) On the panel 30VU:
(a) Make sure that the APU BLEED and the ENG BLEED/1(2) pushbutton switches are released.
(b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
4. Procedure(1) On the panel 30VU:
(a) Make sure that the APU BLEED and the ENG BLEED/1(2) pushbutton switches are released.
(b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
Subtask 21-61-51-220-051-A
A. Measurement of the Air Inlet Flap Backlash
(1) At the centre line of the air inlet flap (1) and the diffuser nose (2):
(a) Measure and note the dimension "A".
(b) Measure and note the dimension "B".
(3) If the backlash is more than 3mm (0.118 in) you must do a check of the in-service wear limits of the air-inlet flap mechanism (Ref. AMM TASK 21-61-51-000-003) and (Ref. AMM TASK 21-61-51-200-003).
(4) If necessary replace the affected parts (Ref. AMM TASK 21-61-51-400-003) and (Ref. AMM TASK 21-61-00-300-001).
(5) Make sure that the work area is clean and clear of tools and other items.
5. Close-up(1) At the centre line of the air inlet flap (1) and the diffuser nose (2):
(a) Measure and note the dimension "A".
(b) Measure and note the dimension "B".
NOTE: The measurement for the dimension "B" must be made with the load applied (hand pressure). Do not apply excessive hand pressure as this could result in a false measurement.
(2) Subtract dimension "A" from dimension "B". This will give you the backlash which exists in the air-inlet flap system. (3) If the backlash is more than 3mm (0.118 in) you must do a check of the in-service wear limits of the air-inlet flap mechanism (Ref. AMM TASK 21-61-51-000-003) and (Ref. AMM TASK 21-61-51-200-003).
(4) If necessary replace the affected parts (Ref. AMM TASK 21-61-51-400-003) and (Ref. AMM TASK 21-61-00-300-001).
(5) Make sure that the work area is clean and clear of tools and other items.
Subtask 21-61-51-865-068-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-61-51-410-058-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 8HH (P1 RAM AIR IN ACTUATOR) | |||
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/115VAC | 1HH | X22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/28VDC | 3HH | X21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/28VDC | 4HH | Y19 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/115VAC | 2HH | Y18 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/115VAC | 49HH | X22 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/28VDC | 51HH | X21 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN B/115VAC | 50HH | Y18 |
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 28HH (P2 RAM AIR IN ACTUATOR) | |||
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/115VAC | 21HH | W22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/28VDC | 23HH | W21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/28VDC | 24HH | Y21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/115VAC | 22HH | Y20 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/115VAC | 53HH | W22 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/28VDC | 55HH | W21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/28VDC | 56HH | Y21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/115VAC | 54HH | Y20 |
B. Remove the WARNING NOTICE(S).
Subtask 21-61-51-862-056-A