Installation of the Emergency Exit Sign

TASK 33-51-16-400-001-A
Installation of the Emergency Exit Sign

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

FIN: 40WL ** ON A/C NOT FOR ALL
FIN: 400WL ** ON A/C NOT FOR ALL
FIN: 41WL ** ON A/C NOT FOR ALL
FIN: 410WL ** ON A/C NOT FOR ALL
FIN: 42WL ** ON A/C NOT FOR ALL
FIN: 420WL ** ON A/C NOT FOR ALL
FIN: 43WL ** ON A/C NOT FOR ALL
FIN: 430WL ** ON A/C NOT FOR ALL
FIN: 44WL ** ON A/C NOT FOR ALL
FIN: 440WL ** ON A/C NOT FOR ALL
FIN: 45WL ** ON A/C NOT FOR ALL
FIN: 450WL ** ON A/C NOT FOR ALL
FIN: 46WL ** ON A/C NOT FOR ALL
FIN: 460WL ** ON A/C NOT FOR ALL
FIN: 47WL ** ON A/C NOT FOR ALL
FIN: 470WL ** ON A/C NOT FOR ALL

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

REFERENCE	QTY	DESIGNATION
No specific	1	STEPLADDER 1.0 M (3.3 FT)

B. 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)
Emergency Exit Sign ** ON A/C NOT FOR ALL
Emergency Exit Sign ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 33-51-16-865-051-A

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	LIGHTING/EMER LT/CABIN	2WL	H06
49VU	LIGHTING/EMER LT/CABIN	1WL	H05
** ON A/C NOT FOR ALL
49VU	LIGHTING/EMER LT/CABIN	2WL	H04
49VU	LIGHTING/EMER LT/CABIN	1WL	H03

Subtask 33-51-16-860-055-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) On overhead panel 25VU, make sure that EMER EXIT LT switch 4WL is in the OFF position.
(2) On overhead panel 25VU, make sure that NO SMOKING switch 190RH is in the OFF position.
(3) On Flight Attendant Panel (FAP) 120RH, make sure that the LIGHT EMER pushbutton switch and its integral light are off.
(4) Make sure that the stepladder is in the correct position.

Subtask 33-51-16-860-055-D ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) On overhead panel 25VU, make sure that EMER EXIT LT switch 4WL is in the OFF position.
(2) On overhead panel 25VU, make sure that NO SMOKING switch 190RH is in the OFF position.
(3) On Flight Attendant Panel (FAP) 120RH, make sure that the EMER pushbutton and its internal light are off.
(4) Make sure that the stepladder is in the correct position.

Subtask 33-51-16-860-055-E ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) On overhead panel 25VU, make sure that EMER EXIT LT switch 4WL is in the OFF position.
(2) On overhead panel 25VU, make sure that EXIT switch 190RH is in the OFF position.
(3) On Flight Attendant Panel (FAP) 120RH, make sure that the EMER button and its light are off.
(4) Make sure that the STEPLADDER 1.0 M (3.3 FT) is in the correct position.

Subtask 33-51-16-860-055-F ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) On overhead panel 25VU, make sure that EMER EXIT LT switch 4WL is in the OFF position.
(2) On overhead panel 25VU, make sure that No PED switch 190RH is in the OFF position.
(3) On Flight Attendant Panel (FAP) 120RH, make sure that the EMER button and its light are off.
(4) Make sure that the STEPLADDER 1.0 M (3.3 FT) is below the related emergency exit sign.

4. Procedure
Subtask 33-51-16-910-056-A

A. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.

Subtask 33-51-16-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Emergency Exit Sign

NOTE: The procedure is the same for all emergency exit signs.

(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: REFER TO THE MATCH MARKS MADE DURING THE REMOVAL WHEN YOU CONNECT THE ELECTRICAL WIRES. INCORRECT CONNECTION OF THE WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

(3) Connect the electrical connectors (5).
(4) Install the emergency exit sign (1) with the washers (4) and the screws (3) on the fuselage structure.
(5) Install the emergency exit sign-lens (2).

Subtask 33-51-16-420-050-B ** ON A/C NOT FOR ALL

B. Installation of the Emergency Exit Sign

NOTE: The procedure is the same for all emergency exit signs.

(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: REFER TO THE MATCH MARKS MADE DURING THE REMOVAL WHEN YOU CONNECT THE ELECTRICAL WIRES. INCORRECT CONNECTION OF THE WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(3) Connect the electrical connectors (5), (10).
(4) Put the housings (4), (9) in position.
(5) Install the washers (3), (8) and the screws (2), (7).
(6) Install the lenses (1), (6).

Subtask 33-51-16-865-053-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	LIGHTING/EMER LT/CABIN	2WL	H06
49VU	LIGHTING/EMER LT/CABIN	1WL	H05
** ON A/C NOT FOR ALL
49VU	LIGHTING/EMER LT/CABIN	2WL	H04
49VU	LIGHTING/EMER LT/CABIN	1WL	H03

Subtask 33-51-16-860-056-A ** ON A/C NOT FOR ALL

D. Preparation for the Test
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On overhead panel 25VU, make sure that NO SMOKING switch 190RH is in the OFF position.
(3) On overhead panel 25VU, make sure that EMER EXIT LT OFF annunciator light 5WL is on.

Subtask 33-51-16-860-056-B ** ON A/C NOT FOR ALL

D. Preparation for the Test
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On overhead panel 25VU, make sure that EXIT switch 190RH is in the OFF position.
(3) On overhead panel 25VU, make sure that EMER EXIT LT OFF annunciator light 5WL is on.

Subtask 33-51-16-860-056-C ** ON A/C NOT FOR ALL

D. Preparation for the Test
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On overhead panel 25VU, make sure that No PED switch 190RH is in the OFF position.
(3) On overhead panel 25VU, make sure that EMER EXIT LT OFF annunciator light is on.

Subtask 33-51-16-710-051-A

E. Operational Test
(1) Do this operational test:

ACTION	RESULT
On overhead panel 25VU:	On the related emergency exit sign:
Set EMER EXIT LT switch 4WL to the ON position.	The related emergency exit sign comes on. On overhead panel 25VU: EMER EXIT LT OFF annunciator light 5WL goes off.
On overhead panel 25VU:	On the related emergency exit sign:
Set EMER EXIT LT switch 4WL to the OFF position.	The related emergency exit sign goes off. On overhead panel 25VU: EMER EXIT LT OFF annunciator light 5WL comes on.

5. Close-up
Subtask 33-51-16-860-052-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) Remove the stepladder.
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:57:28 UTC