Cargo Comp. Lighting - Light in the FWD or AFT Loading Area does not come on

TASK 33-34-00-810-803-A
Cargo Comp. Lighting - Light in the FWD or AFT Loading Area does not come on

1. Possible Causes

lamp
forward loading area light 11LU
forward loading area switch 7LU
wiring
LED unit
aft loading area light 12LU
aft loading area switch 9LU

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 33-34-00-710-001	Operational Test of the FWD and AFT Cargo Compartment Lighting
ASM 333401

3. Fault Confirmation
Subtask 33-34-00-710-052-A

A. Do the operational test of the FWD and AFT Cargo-Compartment Lighting AMM 33-34-00-710-001.

4. Fault Isolation
Subtask 33-34-00-810-054-A ** ON A/C NOT FOR ALL

A. If the operational test shows that the forward Loading Area Light does not come on:

replace the lamp .

(1) If the fault continues:

do a check for 28 VDC at the lamp ASM 333401.

(a) If there is approx. 28 VDC:

replace the forward loading area light 11LU .

(b) If there is no 28 VDC:

do a check of the forward loading area switch 7LU and replace it, if necessary.

(2) If the fault continues:

do a check and repair the wiring between the forward loading area light 11LU and CB 3LU ASM 333401.

Subtask 33-34-00-810-055-A ** ON A/C NOT FOR ALL

B. If the operational test shows that the aft Loading Area Light does not come on:

replace the lamp .

(1) If the fault continues:

do a check for 28 VDC at the lamp ASM 333401.

(a) If there is approx. 28 VDC:

replace the aft loading area light 12LU .

(b) If there is no 28 VDC:

do a check of the aft loading area switch 9LU and replace it, if necessary.

(2) If the fault continues:

do a check of the wiring between the aft loading area light 12LU and CB 3LU ASM 333401.

Subtask 33-34-00-810-054-B ** ON A/C NOT FOR ALL

C. If the operational test shows that the forward Loading Area Light does not come on:

replace the LED unit .

(1) If the fault continues:

do a check for 28 VDC at the LED unit ASM 333401.

(a) If there is approx. 28 VDC:

replace the forward loading area light 11LU .

(b) If there is no 28 VDC:

do a check of the forward loading area switch 7LU and replace it, if necessary.

(2) If the fault continues:

do a check and repair the wiring between the forward loading area light 11LU and CB 3LU ASM 333401.

Subtask 33-34-00-810-055-B ** ON A/C NOT FOR ALL

D. If the operational test shows that the aft Loading Area Light does not come on:

replace the LED unit .

(1) If the fault continues:

do a check for 28 VDC at the LED unit ASM 333401.

(a) If there is approx. 28 VDC:

replace the aft loading area light 12LU .

(b) If there is no 28 VDC:

do a check of the aft loading area switch 9LU and replace it, if necessary.

(2) If the fault continues:

do a check of the wiring between the aft loading area light 12LU and CB 3LU ASM 333401.

Subtask 33-34-00-710-055-A

E. Do the test as given in the Para. 3.A .

5. Close-up
Subtask 33-34-00-860-052-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:31:56 UTC