Removal of the Proximity Switches of the FWD Passenger/Crew Doors

TASK 52-73-11-000-001-A
Removal of the Proximity Switches of the FWD Passenger/Crew Doors

ZONE: 831
ZONE: 841
FIN: 4WN1
FIN: 4WN2

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 5M (16 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
831	FORWARD PASSENGER/CREW DOOR
841	FORWARD PASSENGER/CREW DOOR
831, 841
FOR [4WN1] (PROX SW-HANDLE, L FWD ESC SLIDE)
831CZ
FOR [4WN2] (PROX SW-HANDLE, R FWD ESC SLIDE)
841CZ

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 52-10-00-010-001-A	Opening of the Passenger/Crew Door
TASK 52-10-00-860-001-A	Special Precautions before Work on the Passenger/Crew Door
Proximity Switches (4WN1, 4WN2) of the Passenger/Crew Door
FOR [4WN1] (PROX SW-HANDLE, L FWD ESC SLIDE)
TASK 25-23-46-000-001-A	Removal of the Door Linings from the Forward Passenger/Crew Doors
FOR [4WN2] (PROX SW-HANDLE, R FWD ESC SLIDE)
TASK 25-23-46-000-001-A	Removal of the Door Linings from the Forward Passenger/Crew Doors

3. Job Set-up
Subtask 52-73-11-861-052-A

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

Subtask 52-73-11-010-050-A

B. Get Access

WARNING: DO NOT OPEN THE PASSENGER/CREW DOOR IF THE WIND SPEED IS MORE THAN 65 KNOTS.

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.

(1) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position in front of the applicable passenger/crew door 831 or 841.
(2) Open the FWD applicable passenger/crew door 831 or 841 (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).

Subtask 52-73-11-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C 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 52-73-11-010-058-A

D. Removal of the Lining Panel
(1) Remove the lining panel:
(a) FOR [4WN1] (PROX SW-HANDLE, L FWD ESC SLIDE)
831CZ (Ref. AMM TASK 25-23-46-000-001).
(b) FOR [4WN2] (PROX SW-HANDLE, R FWD ESC SLIDE)
841CZ (Ref. AMM TASK 25-23-46-000-001).
(2) Remove the insulation blanket.

4. Procedure
Subtask 52-73-11-020-050-A

A. Removal of the Proximity Switch

Proximity Switches (4WN1, 4WN2) of the Passenger/Crew Door

(1) Disconnect the electrical connector (1) from the proximity switch (2).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove and discard the lockwire.
(4) Remove the nut (5) and the washer (4).
(5) Remove the proximity switch (2) from the support (3).

[Rev.10 from 2021] 2026.04.02 06:28:35 UTC