W DOC AIRBUS | TSM A320F

Emer. Lighting - Cockpit Annunciator Light EMER EXIT LT OFF 5WL does not operate

TASK 33-51-00-810-816-A
Emer. Lighting - Cockpit Annunciator Light EMER EXIT LT OFF 5WL does not operate

1. Possible Causes
  • EMER EXIT LT OFF (5WL)
  • BOARD-ANN LT TEST & INTFC [7LP]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002
De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 33-14-33-000-001
Removal of the Annunciator-Light Test and Interface-Board
AMM 33-14-33-400-001
Installation of the Annunciator-Light Test and Interface-Board
ASM 335101
3. Fault Confirmation
CAUTION: DO NOT USE THE TEACH-IN PROCEDURE AS AN ALTERNATIVE FOR TROUBLESHOOTING. A TEACH-IN PROCEDURE IS NOT A RESET PROCEDURE. BEFORE YOU DO A TEACH-IN PROCEDURE, MAKE SURE THAT YOU CORRECTED ALL FAILURES. IF YOU DO NOT OBEY THIS, FAILURES CAN CAUSE A MALFUNCTION OF THE CABIN EMERGENCY LIGHTING SYSTEM.
Subtask 33-51-00-865-056-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VULIGHTING/EMER LT/CABIN2WLH06
49VULIGHTING/EMER LT/CABIN1WLH05
122VULIGHTING/CABIN/EMER/LT3WLV07
Subtask 33-51-00-860-062-A
B. Energize the aircraft electrical circuits AMM 24-41-00-861-002.
Subtask 33-51-00-710-079-A
C. Do this test:
ACTION
RESULT
1.In the cockpit, on the SIGNS panel 25VU:
  • set the SW-SIGNS/EMER EXIT LT (4WL) switch to the ON position.
In the cockpit, on the SIGNS panel 25VU:
  • the EMER EXIT LT OFF (5WL) annunciator goes off.
2.On the SIGNS panel 25VU:
  • set the SW-SIGNS/EMER EXIT LT (4WL) switch to the OFF position.
On the SIGNS panel 25VU:
  • the EMER EXIT LT OFF (5WL) annunciator comes on.
4. Fault Isolation
Subtask 33-51-00-810-065-A
A. If the EMER EXIT LT OFF (5WL) annunciator does not come on:
  • put the ANN LT switch on the panel 25VU in the TEST position.
   (1) If the EMER EXIT LT OFF (5WL) annunciator does not come on:
  • do a check of the EMER EXIT LT OFF (5WL) annunciator and replace it if necessary.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check and repair the wiring between:
    BOARD-ANN LT TEST & INTFC [7LP] connector A/44 and EMER EXIT LT OFF (5WL) annunciator connector A/4,
    BOARD-ANN LT TEST & INTFC [7LP] connector A/11 and CB 2WL,
    BOARD-ANN LT TEST & INTFC [7LP] connector A/41 and GND ASM 335101.
Subtask 33-51-00-710-080-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 33-51-00-860-063-A
A. De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:32:08 UTC
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