Failure of the First Officer Dome Lights

TASK 33-12-00-810-802-A
Failure of the First Officer Dome Lights

1. Possible Causes

LT-DOME, F/O [162LE]
LT-DOME, F/O [164LE]
LT-DOME, F/O [166LE]
LT-DOME, F/O [168LE]
wiring
SW-INT LT/DOME [14LE]
LT-DOME, F/O [44LE]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 33-12-00-710-001	Operational Test of the General Illumination
ASM 331201
AIPC 331208
AMM 33-12-11-000-002	Removal of the Cockpit Dome Light
AMM 33-12-11-000-802	Removal of the Cockpit Dome Light
AMM 33-12-11-400-002	Installation of the Cockpit Dome Light
AMM 33-12-11-400-802	Installation of the Cockpit Dome Light

3. Fault Confirmation
Subtask 33-12-00-710-052-A ** ON A/C NOT FOR ALL

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

NOTE: Do this test for the dome lights only.

Subtask 33-12-00-710-052-B ** ON A/C NOT FOR ALL

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

NOTE: Do this test for the dome lights only.

(2) If light is off during the test:
(a) If the F/O dome light (44LE) does not come on when the integral light/dome switch (14LE) is in the DIM position:

Go to Para. A.

(b) If the F/O dome light (44LE) does not come on when integral light/dome switch (14LE) is in the BRT position:

Go to Para. B.

(c) If the F/O dome light (44LE) does not come on when the integral light/dome switch (14LE) is in the DIM position and in the BRT position:

Go to Para. C.

4. Fault Isolation
Subtask 33-12-00-810-051-A ** ON A/C NOT FOR ALL

A. If, during the operational test:
(1) One First Officer light does not operate correctly:

Remove the First Officer light AMM 33-12-11-000-002.
Make sure that there is 28VDC at the lamp socket.

(a) If there is 28VDC:

Replace the defective LT-DOME, F/O [162LE] or LT-DOME, F/O [164LE] LT-DOME, F/O [166LE] or LT-DOME, F/O [168LE] AMM 33-12-11-400-002.

(b) If there is no 28VDC:

Do a check and repair the wiring ASM 331201.

(2) Two First Officer dome lights (162LE) and (164LE) or (166LE) and (168LE) do not operate correctly:

Do a check for a ground signal at pin 3H of the INT LT/DOME switch (14LE) in the BRT position ASM 331201.

(a) If there is no ground signal:

Repair the wiring between pin 3H of the INT LT/DOME switch (14LE) and the ground terminal ASM 331201.

(b) If there is a ground signal

Do a check and repair the wiring of the related First Officer dome lights ASM 331201.

(3) The four First Officer dome lights do not operate correctly:

Do a check for 28VDC at pin 1C of the INT LT/DOME switch (14LE) ASM 331201.

(a) If there is 28VDC:

Do a check for continuity ASM 331201 between:
. Pin 1C of the INT LT/DOME switch (14LE) and pin 2C of the INT LT/DOME switch (14LE)
. Pin 2H of the INT LT/DOME switch (14LE) and pin 1H of the INT LT/DOME switch (14LE).

1 If there is no continuity:

Replace the SW-INT LT/DOME [14LE] AIPC 331208

2 If there is continuity:

Do a check and repair the wiring ASM 331201 between:
. Pin 2C of the INT LT/DOME switch (14LE) and pin 2H of the INT LT/DOME switch (14LE)
. Pin 1H of the INT LT/DOME switch (14LE) and the first branch point
. The ground and the first branch point.

(b) If there is no 28VDC:

Do a check and repair the wiring between pin 1C of the INT LT/DOME switch (14LE) and the first branch point ASM 331201.

Subtask 33-12-00-810-051-B ** ON A/C NOT FOR ALL

A. If during the operational test, on the F/O side:
(1) One, two or three light lines do not operate correctly at the F/O station:

Replace LT-DOME, F/O [44LE] AMM 33-12-11-000-802 and AMM 33-12-11-400-802.

(2) The four light lines do not operate correctly at the F/O station:

Do a check for a ground signal at pin A/D of the F/O dome light (44LE) ASM 331201.

(a) If there is no ground signal:

Repair the wiring between pin A/D of the receptacle of the F/O dome light (44LE) and the ground.

(b) If there is a ground signal:

Do a check for continuity between pin A/A of the receptacle of the F/O dome light (44LE) and pin 1H of the receptacle of the integral light/dome switch (14LE) ASM 331201.

1 If there is no continuity:

Repair the wiring .

2 If there is continuity:

Do a check for 28VDC at pin 2H of the receptacle of the integral light/dome switch (14LE) ASM 331201.

a If there is 28VDC:

Replace SW-INT LT/DOME [14LE] .

b If there is no 28VDC:

Repair the wiring between pin 2H of the receptacle of the integral light/dome switch (14LE) and the first branch point.

Subtask 33-12-00-810-086-A ** ON A/C NOT FOR ALL

B. If during the operational test, on the F/O side:
(1) One, two or three light lines do not operate correctly at the F/O station:

Make sure that there is 28VDC at the related light receptacle.

(a) If there is 28VDC:

Replace LT-DOME, F/O [44LE] AMM 33-12-11-000-802 and AMM 33-12-11-400-802.

(b) If there is no 28VDC:

Repair the wiring between the related pins A/C and/or A/F and/or A/E of the receptacle of the F/O dome light (44LE).

(2) The four light lines station do not operate correctly at the F/O station:

Do a check for a ground signal at pin 3H of the receptacle of the integral light/dome switch (14LE) ASM 331201.

(a) If there is no ground signal:

Repair the wiring between pin 3H of the receptacle of the integral light/dome switch (14LE) and the ground.

(b) If there is a ground signal:

Do a check for a ground signal at pin 1H of the receptacle of the integral light/dome switch (14LE) ASM 331201.

1 If there is no ground signal:

Replace SW-INT LT/DOME [14LE] .

2 If there is a ground signal:

Do a check for continuity between pin 1H of the receptacle of the integral light/dome switch (14LE) and pin A/A of the receptacle of the F/O dome light (44LE) ASM 331201.

a If there is no continuity:

Repair the wiring.

b If there is continuity:

Do a check for 28VDC at pin A/C or A/B or A/F or A/E of the receptacle of the F/O dome light (44LE) ASM 331201.
* If there is 28VDC:
Replace LT-DOME, F/O [44LE] AMM 33-12-11-000-802 and AMM 33-12-11-400-802.
* If there is no 28VDC:
Do a check for continuity between the first branch point and pin 3F of the receptacle of the integral light/dome switch (14LE) ASM 331201.
** If there is no continuity:
Repair the wiring.
** If there is continuity:
Do a check for 28VDC at pin 1F of the receptacle of the integral light/dome switch (14LE) ASM 331201.
** If there is 28VDC:
Replace SW-INT LT/DOME [14LE] .
** If there is no 28VDC:
Repair the wiring between pin 1F of the receptacle of the integral light/dome switch (14LE) and the first branch point.

Subtask 33-12-00-810-087-A ** ON A/C NOT FOR ALL

C. If during the operational test, on the F/O side:
(1) The four light lines do not operate correctly at the F/O station:

Do a check for continuity between pin A/A of the receptacle of the F/O dome light (44LE) and pin 1H of the receptacle of the integral light/dome switch (14LE) ASM 331201.

(a) If there is no continuity:

Repair the wiring.

(b) If there is continuity:

Do a check for 28VDC at pin 2A of the receptacle of the integral light/dome switch (14LE) ASM 331201.

1 If there is 28VDC:

Repair the wiring between pin 2C of the receptacle of the integral light/dome switch (14LE) and the first branch point.

2 If there is no 28VDC:

Do a check for 28VDC at pin 1C of the receptacle of the integral light/dome switch (14LE) ASM 331201.

a If there is 28VDC:

Replace SW-INT LT/DOME [14LE] .

b If there is no 28VDC:

Repair the wiring between pin 1C of the receptacle of the integral light/dome switch (14LE) and the cockpit-dome emergency-light lighting circuit-breaker (1LE).

Subtask 33-12-00-710-053-A

D. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:31:51 UTC