Installation of the Emergency Exit Location-Sign

TASK 33-51-17-400-001-A
Installation of the Emergency Exit Location-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: 50WL ** ON A/C NOT FOR ALL
FIN: 500WL ** ON A/C NOT FOR ALL
FIN: 51WL ** ON A/C NOT FOR ALL
FIN: 510WL ** ON A/C NOT FOR ALL
FIN: 52WL ** ON A/C NOT FOR ALL
FIN: 520WL ** ON A/C NOT FOR ALL
FIN: 53WL ** ON A/C NOT FOR ALL
FIN: 530WL ** ON A/C NOT FOR ALL
FIN: 54WL ** ON A/C NOT FOR ALL
FIN: 540WL ** ON A/C NOT FOR ALL
FIN: 55WL ** ON A/C NOT FOR ALL
FIN: 550WL ** 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 Location Sign ** ON A/C NOT FOR ALL
Emergency Exit Location Sign ** ON A/C NOT FOR ALL
Emergency Exit Location Sign ** ON A/C NOT FOR ALL
Emergency Exit Location-Sign ** ON A/C NOT FOR ALL

3. Job Set-up

CAUTION: DO NOT USE THE TEACH-IN PROCEDURE TO CLEAR EPSU FAILURE MESSAGES. THE TEACH-IN PROCEDURE IS NOT A SYSTEM RESET. IT CAN CHANGE THE EMERGENCY LIGHT CONFIGURATION AND CAUSE HIDDEN FAILURES.

NOTE: The teach-in procedure of the EPSUs measures and keeps the load values that are related to each EPSU. The EPSU controller refers to these load values when the BITE test of the emergency lighting system operates. Thus, it is necessary that the emergency lights of the related EPSUs operate correctly during the teach-in procedure.

Subtask 33-51-17-865-051-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 33-51-17-860-055-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 set to the OFF position.
(2) On overhead panel 25VU, make sure that NO SMOKING switch 190RH is set to the OFF position.
(3) On Forward Attendant Panel (FAP) 120RH, make sure that the LIGHT EMER pushbutton switch and its integral light are off.
(4) Make sure that the STEPLADDER 1.0 M (3.3 FT) is below the related emergency exit location-sign.

Subtask 33-51-17-860-055-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 set to the OFF position.
(2) On overhead panel 25VU, make sure that NO SMOKING switch 190RH is set to 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 1.0 M (3.3 FT) is below the related emergency exit location-sign.

Subtask 33-51-17-860-055-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 set to the OFF position.
(2) On overhead panel 25VU, make sure that EXIT switch 190RH is set to 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 location-sign.

Subtask 33-51-17-860-055-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 set to the OFF position.
(2) On overhead panel 25VU, make sure that No PED switch 190RH is set to 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 location-sign.

4. Procedure
Subtask 33-51-17-910-051-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 33-51-17-420-050-A

B. Installation of the Emergency Exit Location-Sign

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

(1) Remove the CAP-BLANKING from each electrical connector and receptacle.

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.

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

Subtask 33-51-17-865-053-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 33-51-17-860-056-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 33-51-17-860-056-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 33-51-17-860-056-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 5WL is on.

Subtask 33-51-17-710-051-A

E. Operational Test
(1) Do this test:

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

5. Close-up
Subtask 33-51-17-860-052-A

A. Put the aircraft back to the serviceable condition.
(1) Remove the stepladder.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:57:30 UTC