Verification Test of the Automatic Cabin-Pressure Control-Systems

TASK 21-31-00-040-002-A
Verification Test of the Automatic Cabin-Pressure Control-Systems

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
NO	NO	NO	0.5	0.5	1

1. Reason for the Job
MMEL 21-31-02A
MANUAL CABIN PRESSURE CONTROL SYSTEM (MAN V/S CTL SELECTOR, OUTFLOW VALVE MAN CHANNEL)
2. Job Set-up Information
A. 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)
TASK 31-32-00-860-002-A	Procedure to Get Access to the SYSTEM REPORT/TEST/AIR COND Page
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 34-10-00-860-002-A	ADIRS Start Procedure
TASK 34-10-00-860-005-A	ADIRS Stop Procedure

3. Job Set-up
Subtask 21-31-00-865-062-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
122VU	AIR COND/CAB PRESS/CTL/MAN	3HL	Y23
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

Subtask 21-31-00-860-063-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel push the PRESS pushbutton switch, the CAB PRESS page comes into view on the lower ECAM display unit.
(4) On one MCDU get the SYSTEM REPORT/TEST AIR COND menu page (Ref. AMM TASK 31-32-00-860-002).
(5) On the AIR COND panel 30VU, make sure that:

the PACK 1 and the PACK 2 pushbutton switches are in the off position (the OFF legends are on),
the RAM AIR pushbutton switch is in the off position (the ON legend is off).

(6) On the CABIN PRESS panel 25VU, make sure that:

the MODE SEL pushbutton switch is in the AUTO configuration (with the FAULT and MAN legends off),
the LDG ELEV selector is in the AUTO position,
the DITCHING pushbutton switch is in the AUTO configuration (with the ON legend off).

(7) Do the ADIRS start procedure (Ref. AMM TASK 34-10-00-860-002).

4. Procedure
Subtask 21-31-00-710-065-B

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE OUTFLOW VALVES ARE CLEAR. MOVEMENT OF THE OUTFLOW VALVES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

A. Operational Test of the Pressure Control and Monitoring

ACTION	RESULT
1.On the MCDU SYSTEM REPORT/TEST AIR COND menu page: push the line key adjacent to the CPC 1 indication.	On the MCDU: the CAB PRESS CONT 1 page comes on.
2.On the MCDU CAB PRESS CONT 1 menu page: push the line key adjacent to the TEST/CALIBRATION indication.	On the MCDU: the CAB PRESS CONT 1 TEST/CALIBRATION page comes on and shows: ECS PACKS ------------ OFF GROUND AIR SUPPLY ---- OFF LFES ----- SET TO 14000 FT ADIRS 1,2,3 ----------- ON MODE SEL ------------ AUTO comes on.
3.On the CABIN PRESS panel 25VU: set the LDG ELEV selector to 14000 FT.	On the ECAM upper display unit: the green MAN LDG ELEV memo message comes on.
	On the ECAM lower display unit: the green AUTO xxx FT indication changes to the green MAN 14000 FT indication.
4.On the MCDU CAB PRESS CONT 1 TEST/CALIBRATION menu page: push the line key adjacent to CONTINUE.	On the MCDU, the CAB PRESS CONT 1 TEST/CALIBRATION menu page shows: IN PROGRESS (20...90S) comes on, then the message TEST OKAY RESET LFES - > AUTO comes on. NOTE: Do the test again for CPC 2.

(1) Make sure that both automatic pressure control systems are operative.
(2) Put a tag in the cockpit to tell the flight crew that the manual pressure control system is inoperative.
(3) Make an entry in the aircraft technical logbook.

5. Close-up
Subtask 21-31-00-860-064-A

A. Aircraft Maintenance Configuration
(1) On the CABIN PRESS panel 25VU, set the LDG ELEV selector to AUTO.
(2) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
(3) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(4) On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
(5) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:11:13 UTC