Removal of the CABIN PRESSURE Warning-Light Panel of the Emergency Exits

TASK 52-73-22-000-003-A
Removal of the CABIN PRESSURE Warning-Light Panel of the Emergency Exits

WARNING: BEFORE YOU START WORK ON THE DOOR, MAKE SURE THAT:

THE EMERGENCY CONTROL HANDLE IS IN THE DISARMED POSITION WITH THE SAFETY PIN INSTALLED.
THE PERCUSSION LEVER OF THE DOOR-DAMPER AND EMERGENCY-OPERATION CYLINDER IS IN THE DISARMED POSITION WITH THE SAFETY PIN INSTALLED.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, THE DOOR CAN OPEN WITH FORCE OR THE ESCAPE SLIDE CAN DEPLOY SUDDENLY. THIS CAN CAUSE INJURY AND/OR DAMAGE.

WARNING: STOP THE OPENING PROCEDURE IF THE RED WARNING LIGHT FLASHES. IF THE RED WARNING LIGHT FLASHES, REMAINING PRESSURE CAN CAUSE THE DOOR TO OPEN SUDDENLY AND CAN:

KILL OR CAUSE SERIOUS INJURY TO PERSONS
CAUSE DAMAGE TO THE AIRCRAFT.

ZONE: 833
ZONE: 834
ZONE: 835
ZONE: 843
ZONE: 844
ZONE: 845

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
833	EMERGENCY EXITS
834	EMERGENCY EXITS
835	MID PASSENGER/CREW DOOR
843	EMERGENCY EXITS
844	EMERGENCY EXITS
845	MID PASSENGER/CREW DOOR
835, 845
833, 834, 843, 844
FOR [19WN1] (WARN LT PNL-CABIN PRESSURE, FWD L EMERGENCY EXIT)
833CZ
FOR [19WN2] (WARN LT PNL-CABIN PRESSURE, FWD R EMERGENCY EXIT)
843CZ
FOR [20WN1] (WARN LT PNL-CABIN PRESSURE, AFT L EMERGENCY EXIT)
834CZ
FOR [20WN2] (WARN LT PNL-CABIN PRESSURE, AFT R EMERGENCY EXIT)
844CZ

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 25-23-47-000-013-A	Removal of the Door Linings of the RH FWD Emergency Exit Door at zone 251 or RH AFT at zone 252 or LH AFT at zone 232.
TASK 25-23-47-000-802-A	Removal of the Door Linings of the Emergency Exit, zones 251/252
TASK 52-22-00-010-002-A	Opening of the Emergency Exit Doors from the Outside
Emergency Exits - CABIN PRESSURE Warning-Light Panel ** ON A/C NOT FOR ALL
Emergency Exits - CABIN PRESSURE Warning-Light Panel ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-73-22-861-050-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 52-73-22-010-054-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at applicable emergency exit 833 or 834 or 844 or 843.
(2) Open the applicable emergency exit (Ref. AMM TASK 52-22-00-010-002).

Subtask 52-73-22-010-054-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at applicable emergency exit 835 or 845.
(2) Open the applicable emergency exit (Ref. AMM TASK 52-22-00-010-002).

Subtask 52-73-22-865-056-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	EIS/SLIDES/ARM AND WARN/FLT	15WN	P11
121VU	EIS/SLIDES/ARM AND WARN/GND	13WN	P10
121VU	EIS/SDAC1 AND 2/DOOR/DET/PAX	48WV	P05

Subtask 52-73-22-010-055-A ** ON A/C NOT FOR ALL

D. Removal of the Lining Panels of the Emergency Exit
(1) Remove the door lining panel (Ref. AMM TASK 25-23-47-000-013):
(a) FOR [20WN1] (WARN LT PNL-CABIN PRESSURE, AFT L EMERGENCY EXIT)

Lining panel 834CZ.

(b) FOR [20WN2] (WARN LT PNL-CABIN PRESSURE, AFT R EMERGENCY EXIT)

Lining panel 844CZ.

Lining panel 833CZ.

(d) FOR [19WN2] (WARN LT PNL-CABIN PRESSURE, FWD R EMERGENCY EXIT)

Lining panel 843CZ.

Subtask 52-73-22-010-055-B ** ON A/C NOT FOR ALL

D. Removal of the Lining Panels of the Emergency Exit
(1) Remove the door lining panel (Ref. AMM TASK 25-23-47-000-802):
(a) FOR [20WN1] (WARN LT PNL-CABIN PRESSURE, AFT L EMERGENCY EXIT)

Lining panel 834CZ.

(b) FOR [20WN2] (WARN LT PNL-CABIN PRESSURE, AFT R EMERGENCY EXIT)

Lining panel 844CZ.

4. Procedure
Subtask 52-73-22-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the CABIN PRESSURE Warning-Light Panel
(1) Disconnect the electrical connector (6) from the electrical connector (5).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Push the tabs (2) of the CABIN PRESSURE warning-light panel (1).
(4) Remove the CABIN PRESSURE warning-light panel (1) from its support.

Subtask 52-73-22-020-056-A ** ON A/C NOT FOR ALL

B. Removal of the Lamps

WARNING: DO NOT TOUCH THE LAMPS FOR 2 MINUTES AFTER YOU SWITCH OFF THE LIGHT. IF YOU DO, YOU CAN BURN YOUR FINGERS.

(1) Carefully remove the lens (4) from the CABIN PRESSURE warning-light panel (1).
(2) Carefully remove the lamps (3) from the CABIN PRESSURE warning-light panel (1).

[Rev.10 from 2021] 2026.04.01 06:08:47 UTC