FWD and Aft Cargo Compartment Doors do not operate in the Normal Mode

TASK 52-36-00-810-806-A
FWD and Aft Cargo Compartment Doors do not operate in the Normal Mode

1. Possible Causes

LIGHT-AFT DOOR OPEN AND LOCKED [8MJ]
LIGHT-FWD DOOR OPEN AND LOCKED [9MJ]
RELAY-SCCB PWR SPLY [3811GX]
RELAY-TIME [6MJ]
RELAY-L/G POSITION, SYS 2 [12GB]
LGCIU-2 [5GA2]
RELAY-PTU VALVE [1803GL]
RELAY-GND INTERNAL LEAK TEST [1885GP]
TIME RELAY [3816GX]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 29-24-00-810-801-A	Loss or Fluctuation of the Pressure of the Yellow Electric Pump
TSM TASK 52-36-00-810-801-A	Fault during the Opening Procedure of the FWD Cargo-Compartment Door
TSM TASK 52-36-00-810-802-A	Fault during the Opening Procedure of the Aft Cargo-Compartment Door
TSM TASK 52-36-00-810-803-A	Fault during the Closing Procedure of the FWD Cargo-Compartment Door
TSM TASK 52-36-00-810-804-A	Fault during the Closing Procedure of the Aft Cargo-Compartment Door
AMM 52-30-00-860-001	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
AMM 52-35-12-400-001	Installation of the Indicator Light

3. Fault Confirmation
Subtask 52-36-00-860-056-A

A. Aircraft Maintenance Configuration
(1) Operate the FWD or aft cargo-compartment door (referred to as cargo door) as necessary in the normal mode AMM 52-30-00-860-001.

NOTE: Make sure that a second person does not operate the other cargo door.

(2) Operate the FWD or aft cargo door as necessary in the normal mode AMM 52-30-00-860-001.

NOTE: Make sure that a second person does not operate the other cargo door.

4. Fault Isolation
Subtask 52-36-00-810-063-B

A. If the fault confirmation shows that the two cargo doors do not operate in normal mode:

do a check of the CB (1MJ) to make sure that it is closed.

(1) If the CB (1MJ) is open:

do a check of the LIGHT-AFT DOOR OPEN AND LOCKED [8MJ] and LIGHT-FWD DOOR OPEN AND LOCKED [9MJ] to make sure that they are serviceable.

NOTE: If necessary, replace the applicable light AMM 52-35-12-400-001.

(2) If the CB (1MJ) is closed :

set the YELLOW ELEC PUMP P/SW (3804GX) on the cockpit panel 40VU to the ON position and see if the ELEC PUMP-Y (3075GX) operates.

NOTE: Make sure that the selector of the applicable manual selector valve is operated during the fault isolation procedure.

(3) If the ELEC PUMP-Y (3075GX) operates:

do the trouble shooting procedure in the applicable task (Ref. TSM TASK 52-36-00-810-801) or (Ref. TSM TASK 52-36-00-810-802).

(4) If the ELEC PUMP-Y (3075GX) does not operate:

do a trouble shooting of the ELEC PUMP-Y (3075GX)
(Ref. TSM TASK 29-24-00-810-801).

(5) Set the YELLOW ELEC PUMP P/SW (3804GX) on the cockpit panel 40VU to the OFF position.
(6) Do a check for 28 VDC between:
the RELAY-SCCB PWR SPLY [3811GX] connector A/A2 and GND (Ref. ASM 29-24/01).
(a) If there is 28 VDC:

do a check and repair wiring between:
the RELAY-SCCB PWR SPLY [3811GX] connector A/A2 and
the DET-PHASE UNBALANCE, Y ELEC PUMP (3808GX) connector A/F.

(b) If there is no 28 VDC:

do a check for continuity between:
the RELAY-SCCB PWR SPLY [3811GX] connectors A/A1 and A/A2 (Ref. ASM 29-24/01).

1 If there is no continuity:

do a check for 28 VDC between:
the RELAY-SCCB PWR SPLY [3811GX] connector A/X1 and GND (Ref. ASM 29-24/01).

a If there is 28 VDC:

replace the RELAY-SCCB PWR SPLY [3811GX] .

2 If there is continuity:

do a check for continuity between:
the TIME RELAY (6MJ) connector A2 and A1 (Ref. ASM 29-24/01).

a If there is no continuity:

do the trouble shooting procedure of the trigger signal between the RELAY-TIME [6MJ] , the RELAY-L/G POSITION, SYS 2 [12GB] and the LGCIU-2 [5GA2] (Ref. TSM TASK 52-36-00-810-801), (Ref. TSM TASK 52-36-00-810-802), (Ref. TSM TASK 52-36-00-810-803) or (Ref. TSM TASK 52-36-00-810-804).

b If there is continuity:

do a check and repair the wiring between:
the TIME RELAY (6MJ) connector A2 and the CB (3803GX) (Ref. ASM 29-24/01).

(7) If the fault continues:

do a check for continuity between:
the RELAY-PTU VALVE [1803GL] connector 2 and A (Ref. ASM 29-24/01) and
the RELAY-PTU VALVE [1803GL] connector 4 and B (Ref. ASM 29-24/01).

(a) If there is no continuity:

replace RELAY-PTU VALVE [1803GL] .

1 If the fault continues:

do a check and repair the wiring between:
the RELAY-PTU VALVE [1803GL] connectors A and B and the TIME RELAY (6MJ)
connector A1 (Ref. ASM 29-24/01).

(b) If there is continuity:

do a check for continuity between:
the RELAY-GND INTERNAL LEAK TEST [1885GP] connector 2 and A (Ref. ASM 29-24/01).

1 If there is no continuity:

replace the RELAY-GND INTERNAL LEAK TEST [1885GP] .

a If the fault continues:

do a check and repair the wiring between:
the RELAY-GND INTERNAL LEAK TEST [1885GP] connector A and the RELAY-PTU VALVE [1803GL] connector 2 (Ref. ASM 29-24/01).
the RELAY-GND INTERNAL LEAK TEST [1885GP] connector B and the RELAY-PTU VALVE [1803GL] connector 4 (Ref. ASM 29-24/01).

2 If there is continuity:

do a check and repair the wiring between
the RELAY-GND INTERNAL LEAK TEST [1885GP] connector 2 and the RELAY-SCCB PWR SPLY [3811GX] connector A1 (Ref. ASM 29-24/01).

do a check for continuity between:
the RELAY-GND INTERNAL LEAK TEST [1885GP] connector 4 and B (Ref. ASM 29-24/01).

1 If there is continuity:

do a check and repair the wiring between:
the RELAY-GND INTERNAL LEAK TEST [1885GP] connector 4 and the TIME RELAY [3816GX] connector C1 (Ref. ASM 29-24/01).

(8) If the fault continues:

do a check for continuity between:
the TIME RELAY [3816GX] connector A/B2 and A/B1 (Ref. ASM 29-24/01).

(a) If there is no continuity:

replace the TIME RELAY [3816GX] .

(b) If there is continuity:

do a check and repair the wiring between:
the TIME RELAY [3816GX] connector B1 and the RELAY-SCCB PWR SPLY [3811GX] connector X1 (Ref. ASM 29-24/01).

Subtask 52-36-00-869-055-A

B. Do the test given in Para. 3.A to make sure that the operation is correct.

[Rev.8 from Aug 2018] 2026.04.04 04:34:53 UTC