DOC AIRBUS | AMM A320FOperational Check of Low Pressure Indicating Circuit
TASK 26-22-00-710-003-A
Operational Check of Low Pressure Indicating Circuit
Refer to the MPD TASK: 262200-05
OPERATIONAL CHECK OF LOW PRESSURE INDICATING CIRCUIT
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 26-22-00-860-054-A
Subtask 26-22-00-710-056-A
Subtask 26-22-00-410-054-A
[Rev.10 from 2021]
2026.03.31 23:45:32 UTC
Operational Check of Low Pressure Indicating Circuit
WARNING:
BE VERY CAREFUL WHEN YOU MOVE A FULL FIRE EXTINGUISHER BOTTLE. A SUDDEN OR HEAVY SHOCK TO A FULL BOTTLE CAN CAUSE UNWANTED DISCHARGE AND INJURY TO PERSONS.
ZONE: 210
1. Reason for the JobRefer to the MPD TASK: 262200-05
OPERATIONAL CHECK OF LOW PRESSURE INDICATING CIRCUIT
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE |
| No specific | AR | ALLEN KEY 3/32 IN |
| No specific | 1 | BOOMSET 600 OHMS |
| No specific | 1 | FLASHLIGHT |
| No specific | AR | HEADSET 600 OHMS |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 314AR |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 23-51-00-710-001-A | Operational Test of the Audio Management Unit (AMU) |
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| 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-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 52-41-23-010-801-A | Opening of Access Door 314AR |
| TASK 52-41-23-410-801-A | Closing of Access Door 314AR |
CHECK OF THE PRESSURE SWITCHSubtask 26-22-00-860-054-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
(2) Energize the audio integrating system (Ref. AMM TASK 23-51-00-710-001).
(3) On the CAPT jack panel, connect the HEADSET 600 OHMS to the related connector.
(4) On the overhead panel 50VU, make sure that the ON legend on the SVCE INT OVRD pushbutton switch is off.
Subtask 26-22-00-865-062-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
(2) Energize the audio integrating system (Ref. AMM TASK 23-51-00-710-001).
(3) On the CAPT jack panel, connect the HEADSET 600 OHMS to the related connector.
(4) On the overhead panel 50VU, make sure that the ON legend on the SVCE INT OVRD pushbutton switch is off.
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 26-22-00-010-053-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
C. Get Access
(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the access door 314AR.
(3) Open access door 314AR and safety it in the open position.
(Ref. AMM TASK 52-41-23-010-801).
(4) If necessary, use a FLASHLIGHT.
(5) In Zone 314, connect the BOOMSET 600 OHMS to the service interphone jack.
4. ProcedureWARNING:
BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.
(1) Put on and attach a safety harness before you start work in the work area(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the access door 314AR.
(3) Open access door 314AR and safety it in the open position.
(Ref. AMM TASK 52-41-23-010-801).
(4) If necessary, use a FLASHLIGHT.
(5) In Zone 314, connect the BOOMSET 600 OHMS to the service interphone jack.
Subtask 26-22-00-710-056-A
A. Test
5. Close-upNOTE: For this procedure we recommend that a minimum of two persons are in contact with each other with the audio integrating system. One person must monitor the cockpit APU panel 20VU and the other person does the test in the zone 314.
| ACTION | RESULT |
|---|---|
1.On the APU fire extinguisher bottle:
| On the APU FIRE panel 20VU:
|
2.On the APU fire extinguisher bottle:
| On the APU FIRE panel 20VU:
NOTE: The pressure effect must send the Allen Key back to the initial position. |
3.On the APU fire extinguisher bottle:
| |
Subtask 26-22-00-410-054-A
A. Close Access
(1) Disconnect the BOOMSET 600 OHMS from the service interphone jack.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close access door 314AR (Ref. AMM TASK 52-41-23-410-801).
(4) Remove the access platform(s).
Subtask 26-22-00-865-063-A (1) Disconnect the BOOMSET 600 OHMS from the service interphone jack.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close access door 314AR (Ref. AMM TASK 52-41-23-410-801).
(4) Remove the access platform(s).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 26-22-00-860-055-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
C. Put the aircraft back to its initial configuration.
(1) Remove the HEADSET 600 OHMS from the CAPT jack panel.
(2) De-energize the audio integrating system (Ref. AMM TASK 23-51-00-710-001).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) or (Ref. AMM TASK 24-41-00-862-002).
(1) Remove the HEADSET 600 OHMS from the CAPT jack panel.
(2) De-energize the audio integrating system (Ref. AMM TASK 23-51-00-710-001).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) or (Ref. AMM TASK 24-41-00-862-002).