Emergency Lighting - Emergency Lighting in the Cabin come on when the EMER EXIT LT Switch is in the ARM Position

TASK 33-51-00-810-881-A
Emergency Lighting - Emergency Lighting in the Cabin come on when the EMER EXIT LT Switch is in the ARM Position

1. Possible Causes

wiring
SW-SIGNS/EMER EXIT LT [4WL]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 33-51-00-710-004	Check of the Manual Operation from the two Control Panels and of all the Cabin the Cabin Lights and Signs illuminated by Batteries
ASM 335101

3. Fault Confirmation
Subtask 33-51-00-710-207-A

A. Do the operational test of manual operation of both control panels and check all cabin lights and signs illuminated by batteries AMM 33-51-00-710-004.

4. Fault Isolation
Subtask 33-51-00-810-223-A

A. If the emergency lighting in the cabin comes on before the circuit breakers 1WL and 2WL are opened:

do a check and repair the wiring between:
SW-SIGNS/EMER EXIT LT [4WL] switch pin 3C and POWER SUPPLY UNIT-EMERGENCY (10WL) connector A/<D,
SW-SIGNS/EMER EXIT LT [4WL] switch pin 2B and POWER SUPPLY UNIT-EMERGENCY (10WL) connector A/B,
SW-SIGNS/EMER EXIT LT [4WL] switch pin 3B and POWER SUPPLY UNIT-EMERGENCY (10WL) connector A/A
ASM 335101.

(1) If the fault continues:

do a check of the SW-SIGNS/EMER EXIT LT [4WL] and replace it if necessary.

Subtask 33-51-00-710-208-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 33-51-00-860-136-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:32:13 UTC