Operational Check of all Pressure Sensing Channels for Rapid Decompression

TASK 52-51-00-720-002-A
Operational Check of all Pressure Sensing Channels for Rapid Decompression

ZONE: 220

1. Reason for the Job
Refer to the MPD TASK: 525111-02
OPERATIONAL CHECK OF ALL PRESSURE SENSING CHANNELS FOR RAPID DECOMPRESSION.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	DECOMPRESSION TEST SIMULATOR

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
220	FWD CAB UTILITY AREAS

C. Referenced Information

REFERENCE	DESIGNATION
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)

3. Job Set-up
Subtask 52-51-00-860-066-A

A. Aircraft Maintenance Configuration
(1) Make sure that the cockpit door is closed.
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 52-51-00-865-060-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	DOORS/PAX/MONG	1MQ	T13
** ON A/C NOT FOR ALL
122VU	DOORS CKPT LOCK	1MQ	T13
122VU	COCKPIT DOOR LOCK SYSTEM	1MQ	T13

4. Procedure
Subtask 52-51-00-720-052-A

A. Functional Test of the Decompression Event
(1) Do the test to make sure that the pressure sensors in the control unit 24MQ operate correctly.

NOTE: In this test a rapid decompression of the cabin pressure is simulated with the DECOMPRESSION TEST SIMULATOR (referred to as vacuum pump).
AIRBUS recommends the use of P/N AR 4728-1 (manufacturer ADAMS RITE AEROSPACE) or the equivalent standard.

ACTION	RESULT
1.On the CKPT DOOR CONT Panel 20VU:	On the CKPT DOOR CONT panel 20VU:
put the vacuum pump in one of the pressure sensor holes and operate it.	On the Cockpit Door: you can hear a clacking noise from the solenoids of the electrical release strikes because they are without power.
remove the vacuum pump from the pressure sensor.	the electrical strike-release units operate automatically to lock the cockpit door.
put the vacuum pump in the other pressure sensor hole.	On the Cockpit Door: you can hear a clacking noise from the solenoids of the electrical release strikes because they are without power.
remove the vacuum pump from the pressure sensor hole.	the electrical release strikes operate automatically to lock the cockpit door.

5. Close-up
Subtask 52-51-00-860-067-A

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:28:23 UTC