Emer. Lighting - The Exit Signs Flicker

TASK 33-51-00-810-819-A
Emer. Lighting - The Exit Signs Flicker

1. Possible Causes

RELAY 8WL
DIODE (on diode holder 1158VD)
DIODE (in diode holder 1158VD)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 335100
AMM 33-51-00-710-001	Operational Test of the Emergency Lights

3. Fault Confirmation
Subtask 33-51-00-710-209-A ** ON A/C NOT FOR ALL

A. Do this Test
(1) Do the operational test of the emergency lights by TEST EMER LIGHT SYS pushbutton AMM 33-51-00-710-001.
(2) On the overhead panel 25VU, set the NO SMOKING switch 190RH to the ON position.
(3) Monitor the EXIT signs in the cabin.
(4) On the overhead panel 25VU, set the NO SMOKING switch 190RH to the AUTO position.
(5) Monitor the EXIT signs in the cabin.

Subtask 33-51-00-710-209-C ** ON A/C NOT FOR ALL

A. Operational Test
(1) Do this test:
(a) Do the operational test of the emergency lights, refer to TEST EMER LIGHT SYS pushbutton AMM 33-51-00-710-001.
(b) On overhead panel 25VU, set No PED switch 190RH to the ON position.
(c) Monitor the EXIT signs in the cabin.
(d) On overhead panel 25VU, set No PED switch 190RH to the AUTO position.
(e) Monitor the EXIT signs in the cabin.

4. Fault Isolation
Subtask 33-51-00-810-224-A ** ON A/C NOT FOR ALL

A. If the exit signs in the cabin flicker with NO SMOKING switch 190RH in either the ON or the AUTO position:

Replace RELAY 8WL in relay box 103VU in the electronics compartment ASM 335100.

(1) If the fault continues:

Replace the DIODE (on diode holder 1158VD) between pins 31 and 32 on panel 103VU126 ASM 335100.

Subtask 33-51-00-810-224-C ** ON A/C NOT FOR ALL

A. If the exit signs in the cabin flicker with No PED switch 190RH in one of the two the ON or the AUTO position:

Replace RELAY 8WL in relay box 103VU in the electronics compartment, refer to ASM 335100.

(1) If the fault continues:

Replace the DIODE (in diode holder 1158VD) between pins 31 and 32 on panel 103VU126 ASM 335100.

Subtask 33-51-00-710-084-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 33-51-00-860-075-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:32:09 UTC