Failure of the F/O Map Table Light

TASK 33-12-00-810-821-A
Failure of the F/O Map Table Light

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 33-12-00-710-001	Operational Test of the General Illumination
AIPC 331201
ASM 331201
AMM 33-12-12-000-804	Removal of the Map Table Light
AMM 33-12-12-400-804	Installation of the Map Table Light
AMM 33-12-18-000-802	Removal of the Map-Table Light Control-Box
AMM 33-12-18-400-802	Installation of the Map-Table Light Control-Box

3. Fault Confirmation
Subtask 33-12-00-710-090-A

A. Test
Do the operational test of the general illumination AMM 33-12-00-710-001.

NOTE: Do this test for the instrument lighting, the supplementary reading lights, the map table lights and the center pedestal light only.

4. Fault Isolation
Subtask 33-12-00-810-071-A ** ON A/C NOT FOR ALL

A. If, during the operational test:
(1) The dimming function of the F/O map table light rheostat is not operative:

(2) The F/O map table light does not come on:

make sure that there is 28VDC at the F/O map table light rheostat (40LE) pin A ASM 331201.

(a) If there is 28VDC:

1 If the fault continues:

repair the wiring between the F/O map table light (42LE) and the related rheostat (40LE) ASM 331201.

(b) If there is no 28VDC:

1 If the fault continues:

do a check of the wiring from the F/O map table light rheostat (40LE) pin 1 to the first terminal block ASM 331201.

a If the fault continues:

repair the wiring from the F/O map table light rheostat (40LE) pin 2 to the ground terminal block ASM 331201.

Subtask 33-12-00-810-071-C ** ON A/C NOT FOR ALL

A. If, during the operational test:
(1) The dimming function of the F/O map table light does not operate correctly:

(2) The F/O map-table light (42LE) does not come on:

Make sure that there is 28VDC at pin 1 of the receptacle of the F/O map-table-light control-box (54LE) ASM 331201.

(a) If there is no 28VDC:

(b) If there is 28VDC:

Do a check for a ground signal at ASM 331201:
- Pin 3 of the receptacle of the F/O map-table-light control-box (54LE)
- Pin 2 of the receptacle of the F/O map-table-light control-box (54LE).

1 If there is no ground signal:

2 If the fault continues:

a If the fault continues:

Subtask 33-12-00-710-091-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:31:53 UTC