Fault during the Opening Procedure of the FWD Cargo-Compartment Door

TASK 52-36-00-810-801-A
Fault during the Opening Procedure of the FWD Cargo-Compartment Door

1. Possible Causes

PACKAGE E-PUMP [3075GX]
RELAY (15MJ)
wiring
RELAY-TIME [6MJ]
RELAY-L/G POSITION, SYS 2 [12GB]
LGCIU-2 [5GA2]
MAN SEL VALVE-FWD CARGO DOOR [2501MJ]
SW-LOCKING SHAFT [5MJ]
4VD
ACTUATOR-FWD CARGO DOOR, FWD [2502MJ]
ACTUATOR-FWD CARGO DOOR, AFT [2503MJ]
SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ]
RELAY (13MJ)
RELAY (14MJ)
VALVE-DOUBLE CHECK [3717GM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 32-31-00-810-802-A	LGCIU Fault
TSM TASK 32-31-00-810-834-A	Cargo Door (Fwd) Lockshaft Proximity Sensor Fault (5MJ)
ESPM 204423
ASM 292401
AMM 52-30-00-860-001	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
AMM 52-30-00-860-003	Open the FWD or Aft Cargo-Compartment Door with the Hand Pump
ASM 523501
AMM 52-35-13-400-002	Installation of the Proximity Switches
AMM 52-36-12-000-001	Removal of the Electro-Manual Selector Valve
AMM 52-36-12-400-001	Installation of the Electro-Manual Selector Valve
AMM 52-36-13-000-001	Removal of Double Check Valve
AMM 52-36-13-400-001	Installation of Double Check Valve
AMM 52-36-15-000-001	Removal of the Manual Selector Valve
AMM 52-36-15-400-001	Installation of the Manual Selector Valve
AMM 52-36-18-000-001	Removal of the Door Actuator
AMM 52-36-18-400-001	Installation of the Door Actuator

3. Fault Confirmation
Subtask 52-36-00-860-050-A

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

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

(2) Open the aft cargo door in the normal mode AMM 52-30-00-860-001.

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

4. Fault Isolation
Subtask 52-36-00-810-050-D

A. If the fault confirmation gives that only the FWD cargo door does not open and the PACKAGE E-PUMP [3075GX] does not operate (fault in the door control system):

Do a check for 28 VDC between the RELAY (15MJ) connector A/A2 and GND
ASM 523501.

NOTE: The selector of the manual selector valve 2501MJ must stay in the OPEN position during the fault isolation procedure.

(1) If there is no 28 VDC:

Do a check for 28 VDC between the RELAY (15MJ) connector A/X and GND
ASM 523501.

(2) If there is 28 VDC:

Do a check for 28 VDC between the RELAY (15MJ) connector A/A1 and GND
ASM 523501.

(3) If there is no 28 VDC:

Do a check and repair the wiring as necessary between the RELAY (15MJ) connector A/A1 and the CB (1MJ)
ASM 523501.

(4) If there is 28 VDC:

Replace the RELAY (15MJ).

(5) If there is no 28 VDC:
(a) Do a check for 28 VDC between the RELAY-TIME [6MJ] connector A/C1 and GND:

ASM 523501.

(b) Do a check for 28 VDC between the RELAY-TIME [6MJ] connector A/A1 and GND:

ASM 292401.

(6) If there is no 28 VDC:

Do a check for 28 VDC between the RELAY-L/G POSITION, SYS 2 [12GB] connector A/D1 and A/D2
ASM 523501.

(7) If there is 28 VDC:

Do a check for continuity the RELAY-L/G POSITION, SYS 2 [12GB] connector A/D1 and A/D2
ASM 523501.

(8) If there is continuity:

Do a check and repair the wiring as necessary between the RELAY-TIME [6MJ] connector A/C1 and the RELAY-L/G POSITION, SYS 2 [12GB] connector A/D2
ASM 523501.

(9) If there is no continuity:

Replace the RELAY-L/G POSITION, SYS 2 [12GB]

(10) If there is no 28 VDC:

Do a check and repair the wiring as necessary between the LGCIU-2 [5GA2] connector AA/8A and the RELAY-L/G POSITION, SYS 2 [12GB] connector A/D1
ASM 523501.

(11) If there is 28 VDC:

Do a check and repair the wiring as necessary between the RELAY-TIME [6MJ] connector A/C1 and RELAY (15MJ) connector A/X
ASM 523501.

(12) If there is 28 VDC:

Do a check for 28 VDC between the RELAY-TIME [6MJ] connector A/X1 and GND
ASM 523501.

(13) If there is 28 VDC:

Do a check and repair the wiring as necessary between the RELAY-TIME [6MJ] connector A/X2 and GND
ASM 523501.

(14) If the fault continues:

Replace the RELAY-TIME [6MJ] .

(15) If there is no 28 VDC:

Do a check and repair the wiring as necessary between the RELAY-TIME [6MJ] connector A/X1 and the CB (1MJ)
ASM 523501.

(16) If the fault continues:

Do a check for a GND signal at the LGCIU-2 [5GA2] connector AA/9A
ASM 523501.

(17) If the fault continues:

Do a check for 28 VDC between the LGCIU-2 [5GA2] connector AA/7A and GND
ASM 523501.

(18) If there are no 28 VDC:

Do a check for continuity between the LGCIU-2 [5GA2] connector A/B and the MAN SEL VALVE-FWD CARGO DOOR [2501MJ] connector AA/7A
ASM 523501.

(19) If there is no continuity:

Do a check and repair the wiring as necessary between the MAN SEL VALVE-FWD CARGO DOOR [2501MJ] connector A/B and the LGCIU-2 [5GA2] connector AA/7A
ASM 523501.

(20) If there is continuity:

Do a check for 28 VDC between the MAN SEL VALVE-FWD CARGO DOOR [2501MJ] connector A/A and GND
ASM 523501.

(21) If there is no 28 VDC:
(a) Do a check and repair the wiring as necessary between:

The MAN SEL VALVE-FWD CARGO DOOR [2501MJ] connector A/A and the CB (1MJ)
The MAN SEL VALVE-FWD CARGO DOOR [2501MJ] connector A/C and the GND ASM 523501.

(22) If there is 28 VDC:
(a) Replace the MAN SEL VALVE-FWD CARGO DOOR [2501MJ] AMM 52-36-15-000-001 and AMM 52-36-15-400-001.
(23) If there is 28 VDC:

Do the trouble shooting of the LGCIU-2 [5GA2] (Ref. TSM TASK 32-31-00-810-802).

(24) If the fault continues:

Make sure that the clearance between the target and the proximity sensor ( SW-LOCKING SHAFT [5MJ] ) is correctly adjusted AMM 52-35-13-400-002.

(25) If the fault continues:

Do the trouble shooting of the SW-LOCKING SHAFT [5MJ] (Ref. TSM TASK 32-31-00-810-834).

(26) If the fault continues:

Do the trouble shooting of the LGCIU-2 [5GA2] (Ref. TSM TASK 32-31-00-810-802).

(27) If the fault continues:

Replace the DIODE MODULE 4VD ESPM 204423.

Subtask 52-36-00-810-054-B

B. If the test shows that the FWD cargo door does not open but the PACKAGE E-PUMP [3075GX] operates (fault in the door hydraulic system):

operate the aft cargo door AMM 52-30-00-860-001.

(1) If the aft cargo door moves:

replace the MAN SEL VALVE-FWD CARGO DOOR [2501MJ] AMM 52-36-15-000-001 and AMM 52-36-15-400-001.

(a) If the fault continues:

replace the ACTUATOR-FWD CARGO DOOR, FWD [2502MJ] and/or the ACTUATOR-FWD CARGO DOOR, AFT [2503MJ] AMM 52-36-18-000-001 and AMM 52-36-18-400-001.

(2) If the aft cargo door does not move:

open the FWD cargo door with the hand pump 3009GM AMM 52-30-00-860-003.

(a) If the FWD cargo door opens:

do a check for 28 VDC between:
the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] connector A/A and A/B ASM 523501.

1 If there is 28 VDC:

do a check for continuity between:
the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] connector A/B and connector A/A ASM 523501.

a If there is no continuity:

replace the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] AMM 52-36-12-000-001 and AMM 52-36-12-400-001.

b If there is continuity:

do a check and repair the wiring between:
the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] connector A/A and GND ASM 523501.

2 If there is no 28 VDC:

do a check and repair the wiring between:
the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] connector A/B and the RELAY (13MJ) connector A/B3 ASM 523501
the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] connector A/B and the RELAY (14MJ) connector A/B3 ASM 523501
the RELAY (13MJ) connector A/B2 and the RELAY (15MJ) connector A/A2 ASM 523501
the RELAY (14MJ) connector A/B2 and the RELAY (15MJ) connector A/A2 ASM 523501.

(b) If the FWD cargo door does not open:

replace the VALVE-DOUBLE CHECK [3717GM] AMM 52-36-13-000-001 and AMM 52-36-13-400-001.

Subtask 52-36-00-810-066-A

C. If the FWD Cargo Door does not open fully:
(1) Replace the MAN SEL VALVE-FWD CARGO DOOR [2501MJ] AMM 52-36-15-000-001 and AMM 52-36-15-400-001.
(2) If the fault continues:
(a) Replace the SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] AMM 52-36-12-000-001 and AMM 52-36-12-400-001.
(3) If the fault continues:
(a) Replace the ACTUATOR-FWD CARGO DOOR, FWD [2502MJ] AMM 52-36-18-000-001 and AMM 52-36-18-400-001.
(4) If the fault continues:
(a) Replace the ACTUATOR-FWD CARGO DOOR, AFT [2503MJ] AMM 52-36-18-000-001 and AMM 52-36-18-400-001.
(5) If the fault continues:
(a) Replace the VALVE-DOUBLE CHECK [3717GM] AMM 52-36-13-000-001 and AMM 52-36-13-400-001.

Subtask 52-36-00-869-051-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:34:51 UTC