Deactivation of the EMER EXIT LT OFF Annunciator Light

TASK 33-51-00-040-002-A
Deactivation of the EMER EXIT LT OFF Annunciator Light

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	WARNING NOTICE(S)

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)

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 33-51-00-861-058-A

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

Subtask 33-51-00-865-057-A

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

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
** ON A/C ALL
122VU	LIGHTING/CABIN/EMER/LT	3WL	V07

Subtask 33-51-00-860-078-A ** ON A/C NOT FOR ALL

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

Subtask 33-51-00-860-078-D ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On the Flight Attendant Panel (FAP) 120RH, make sure that the EMER button and its light are off.
(2) On the overhead panel 25VU, make sure that the NO SMOKING switch 190RH is in the OFF position.
(3) On the overhead panel 25VU, set the EMER EXIT LT switch 4WL to the ARM position.

Subtask 33-51-00-860-078-E ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On the Flight Attendant Panel (FAP) 120RH, make sure that the EMER button and its light are off.
(2) On the overhead panel 25VU, make sure that the EXIT switch 190RH is in the OFF position.
(3) On the overhead panel 25VU, set the EMER EXIT LT switch 4WL to the ARM position.

Subtask 33-51-00-860-078-F ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On Flight Attendant Panel (FAP) 120RH, make sure that the EMER button and its light are off.
(2) On overhead panel 25VU, make sure that No PED switch 190RH is in the OFF position.
(3) On overhead panel 25VU, set EMER EXIT LT switch 4WL to the ARM position.

4. Procedure
Subtask 33-51-00-710-061-A ** ON A/C NOT FOR ALL

A. Operational Test
(1) Do this test of the cabin emergency lighting system:

NOTE: The time taken to do this test must not be more than 3 minutes, to prevent discharge of the emergency lighting batteries.

ACTION	RESULT
1.On circuit breaker panel 49VU: Open circuit breakers 1WL and 2WL.	In the cabin: All the cabin emergency lights come on. All the exit marking signs come on. All the exit location signs come on. All the electrical lights of the Floor-Proximity Emergency-Escape-Path Marking-System come on. All the emergency-escape hatch-handle lights come on.
2.On circuit breaker panel 49VU: Close circuit breakers 1WL and 2WL.	In the cabin: All the cabin emergency lights go off. All the exit marking signs go off. All the exit location signs go off. All the electrical lights of the Floor-Proximity Emergency-Escape-Path Marking-System go off. All the emergency-escape hatch-handle lights go off.

Subtask 33-51-00-710-061-B ** ON A/C NOT FOR ALL

A. Operational Test
(1) Do the test of the cabin emergency lighting system:

NOTE: The time to do this test must not be more than 3 minutes, to prevent discharge of the emergency lighting batteries.

ACTION	RESULT
1.On circuit breaker panel 49VU: Open circuit breakers 1WL and 2WL.	In the cabin: All the cabin emergency lights come on. All the exit marking signs come on. All the exit location signs come on. All the electrical lights of the Floor-Proximity Emergency-Escape-Path Marking-System come on.
2.On circuit breaker panel 49VU: Close circuit breakers 1WL and 2WL.	In the cabin: All the cabin emergency lights go off. All the exit marking signs go off. All the exit location signs go off. All the electrical lights of the Floor-Proximity Emergency-Escape-Path Marking-System go off.

5. Close-up
Subtask 33-51-00-860-060-A

A. Put the aircraft back to the serviceable condition.
(1) Make an entry in the logbook.
(2) Put WARNING NOTICE(S) in the cockpit to tell persons not to operate the Cabin Emergency Lighting System.
(3) Set EMER EXIT LT switch 4WL on overhead panel 25VU to the OFF position.
(4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:57:03 UTC