Operational Test of the Residual Cabin Pressure Warning System and In-Situ Functional Test of the Cabin Pressure Detection Pressure-Switch

TASK 52-73-00-720-003-A
Operational Test of the Residual Cabin Pressure Warning System and In-Situ Functional Test of the Cabin Pressure Detection Pressure-Switch

ZONE: 122

1. Reason for the Job
Refer to the MPD TASK: 527300-02
OPERATIONAL CHECK OF RESIDUAL CABIN PRESSURE WARNING AND FUNCTIONAL CHECK OF DIFFERENTIAL PRESSURE SWITCH

This task is only applicable for passenger/crew doors that are not
manually blocked from the inside/outside of the aircraft.
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	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	1	GENERATOR - GROUND PRESSURE MINI. 100 MB
98D34003500000	1	ADAPTER COVER-STATIC PORT

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
122	AVIONICS COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 52-10-00-010-001-A	Opening of the Passenger/Crew Door
TASK 52-10-00-410-001-A	Closing of the Passenger/Crew Door
TASK 52-10-00-860-001-A	Special Precautions before Work on the Passenger/Crew Door
TASK 52-10-00-860-002-A	Special Precautions after Work on the Passenger/Crew Door
TASK 52-22-00-010-002-A	Opening of the Emergency Exit Doors from the Outside
TASK 52-22-00-410-002-A	Closing of the Emergency Exit Doors from the Outside
TASK 52-22-00-860-003-A	Special Precaution before Maintenance on the Door Damper and Emergency Operation Cylinder
TASK 52-22-00-860-004-A	Special Precaution after Maintenance on the Door Damper and Emergency Operation Cylinder

3. Job Set-up
Subtask 52-73-00-861-053-A

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 52-73-00-010-056-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position in front of one of the passenger/crew door 831 or 841 or 832 or 842.
(2) Open the applicable passenger/crew door (Ref. AMM TASK 52-10-00-010-001).
(3) Obey the special precautions before you start work on the door (Ref. AMM TASK 52-10-00-860-001).
(4) Close the passenger/crew door (Ref. AMM TASK 52-10-00-410-001).

Subtask 52-73-00-010-056-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position in front of the applicable passenger/crew door 831 or 841 or 832 or 842, emergency exit 833 or 843 or 843 or 844.
(2) Open the applicable passenger/crew door (Ref. AMM TASK 52-10-00-010-001), emergency exit (Ref. AMM TASK 52-22-00-010-002).
(3) Obey the special precautions before you start work on the door (Ref. AMM TASK 52-10-00-860-001) (Ref. AMM TASK 52-22-00-860-003).
(4) Close all the doors (Ref. AMM TASK 52-10-00-410-001) (Ref. AMM TASK 52-22-00-410-002).

Subtask 52-73-00-860-061-A

C. Aircraft Maintenance Configuration
(1) On the panel 115VU, make sure that the ENG MASTER 1 and MASTER 2 toggle switches are in the OFF position.

Subtask 52-73-00-865-059-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/OIL/PRESS	2EN2	N42
121VU	ENGINE/ENG1/OIL/PRESS	2EN1	N40
** ON A/C ALL
121VU	EIS/SLIDES/ARM AND WARN/FLT	15WN	P11
121VU	EIS/SLIDES/ARM AND WARN/GND	13WN	P10
** ON A/C NOT FOR ALL
121VU	OIL/PRESS/ENG2	10KC2	N42
121VU	OIL/PRESS/ENG1	10KC1	N40
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/OIL/PRESS/AND REV SNSR/CHAN A	2EN2	N42
121VU	ENGINE/ENG1/OIL/PRESS/AND REV SNSR/CHAN A	2EN1	N40

Subtask 52-73-00-020-051-A

E. Tool Connection
(1) On the standby altimeter, set the zero altitude and write the local atmospheric pressure.
(2) Connect the air-data pressure generator GENERATOR - GROUND PRESSURE MINI. 100 MB to one standby static probe with the static-probe charging adapter 98D34003500000 ADAPTER COVER-STATIC PORT.
(3) Seal the opposite standby probe with the static probe cover.

4. Procedure
Subtask 52-73-00-720-051-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the test below:

ACTION	RESULT
1.On the pressure generator, decrease the static pressure by 3 hPa (0.0886 in.Hg) during one minute.	On all the passenger/crew doors the CABIN PRESSURE warning light flashes.
2.On the pressure generator increase the static pressure to the local atmospheric pressure.	On all the passenger/crew doors the CABIN PRESSURE warning light goes off.

Subtask 52-73-00-720-051-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the test below:

ACTION	RESULT
1.On the pressure generator, decrease the static pressure by 3 hPa (0.0886 in.Hg) during one minute.	On all the passenger/crew doors and the emergency exits the CABIN PRESSURE warning light panel flashes.
2.On the pressure generator increase the static pressure to the local atmospheric pressure.	On all the passenger/crew doors and the emergency exits the CABIN PRESSURE warning light panel goes off.

5. Close-up
Subtask 52-73-00-420-051-A

A. Tool Disconnection
(1) Disconnect the air-data pressure generator GENERATOR - GROUND PRESSURE MINI. 100 MB.
(2) Remove the 98D34003500000 ADAPTER COVER-STATIC PORT.

Subtask 52-73-00-410-052-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Obey the special precautions after the work on the door (Ref. AMM TASK 52-10-00-860-002).
(2) Make sure the passenger/crew door is closed (Ref. AMM TASK 52-10-00-410-001).
(3) Remove the access platform(s).

Subtask 52-73-00-410-052-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Obey the special precautions after the work on the door or emergency exit (Ref. AMM TASK 52-10-00-860-002) (Ref. AMM TASK 52-22-00-860-004).
(2) Make sure that the applicable passenger/crew door or emergency exit is closed (Ref. AMM TASK 52-10-00-410-001) (Ref. AMM TASK 52-22-00-410-002).
(3) Remove the access platform(s).

Subtask 52-73-00-862-053-A

C. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 07:24:19 UTC