DOC AIRBUS | AMM A320FDeactivation of the Reservoir Air Pressure Switches and Check of the Reservoir Air Pressure of the Green and Yellow Hydraulic System
TASK 29-34-00-040-001-A
Deactivation of the Reservoir Air Pressure Switches and Check of the Reservoir Air Pressure of the Green and Yellow Hydraulic System
MMEL 29-09-04A
HYD G(B)(Y) RSVR LO AIR PR ALERT
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 29-34-00-865-050-A
Subtask 29-34-00-040-050-A
Subtask 29-34-00-410-050-A
[Rev.10 from 2021]
2026.04.01 00:28:00 UTC
Deactivation of the Reservoir Air Pressure Switches and Check of the Reservoir Air Pressure of the Green and Yellow Hydraulic System
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
1. Reason for the JobMMEL 29-09-04A
HYD G(B)(Y) RSVR LO AIR PR ALERT
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| No specific | 2 | CAP - PROTECTION |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | TIE WRAP(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 196BB |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 29-14-00-614-002-A | Pressurization of the Hydraulic Reservoirs through the Ground Connector |
| TASK 29-14-00-614-002-A-01 | Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU) |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
Reservoir Air Pressure Switches of the Green and Yellow Hydraulic SystemSubtask 29-34-00-865-050-A
A. Open, safety and tag this(these) circuit breaker(s):
Subtask 29-34-00-010-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 1384GH (AIR PRESSURE SWITCH) | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R33 |
| ** ON A/C ALL | |||
| FOR FIN: 3384GH (AIR PRESSURE SWITCH) | |||
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
B. Get Access
(1) Open the applicable access door:
4. Procedure(1) Open the applicable access door:
- One main gear door for 1384GH (Ref. AMM TASK 32-12-00-010-001).
NOTE: Access is better from the Right Hand (RH) side.
- 196BB and the RH main gear door for 3384GH (Ref. AMM TASK 32-12-00-010-001).
Subtask 29-34-00-040-050-A
A. Deactivation of the Reservoir Air Pressure Switches
(1) Disconnect the applicable electrical connector (1) 1384GH-A or 3384GH-A from the pressure switch.
(2) Install a CAP - PROTECTION on the disconnected connector (1) and on the receptacle.
(3) For the pressure switch 1384GH:
(a) Put the disconnected connector and the end of the cable through the hole in FR42 into the main gear compartment.
(b) Use a TIE WRAP(S) and attach the disconnected cable to a part of the structure in the main gear compartment.
(6) Look on the air pressure gages on the applicable reservoir and make sure that the air pressure is not less than 37 psi.
(7) If necessary, pressurize the reservoir (Ref. AMM TASK 29-14-00-614-002).
5. Close-up(1) Disconnect the applicable electrical connector (1) 1384GH-A or 3384GH-A from the pressure switch.
(2) Install a CAP - PROTECTION on the disconnected connector (1) and on the receptacle.
(3) For the pressure switch 1384GH:
- Use a TIE WRAP(S) and attach the disconnected cable to a part of the structure.
NOTE: Attach the cable to the structure so that the disconnected end of the connector points down. This prevents the contamination of the connector with oil or other liquids.
(4) For the pressure switch 3384GH: (a) Put the disconnected connector and the end of the cable through the hole in FR42 into the main gear compartment.
(b) Use a TIE WRAP(S) and attach the disconnected cable to a part of the structure in the main gear compartment.
NOTE: Attach the cable to the structure so that the disconnected end of the connector points down. This prevents the contamination of the connector with oil or other liquids.
(5) Make an entry in the logbook.(6) Look on the air pressure gages on the applicable reservoir and make sure that the air pressure is not less than 37 psi.
(7) If necessary, pressurize the reservoir (Ref. AMM TASK 29-14-00-614-002).
Subtask 29-34-00-410-050-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform.
(3) Close the applicable access door(s)
Subtask 29-34-00-865-070-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform.
(3) Close the applicable access door(s)
- 196BB and the RH main gear door (Ref. AMM TASK 32-12-00-410-001)
- The main gear door (Ref. AMM TASK 32-12-00-410-001).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 1384GH (AIR PRESSURE SWITCH) | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R33 |
| ** ON A/C ALL | |||
| FOR FIN: 3384GH (AIR PRESSURE SWITCH) | |||
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |