Fault of the Locking Indication of the Aft Door Actuators

TASK 52-35-00-810-801-A
Fault of the Locking Indication of the Aft Door Actuators

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 52-30-00-860-001	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
ASM 523501
AMM 52-35-12-000-002	Removal of the Indicator Light
AMM 52-35-12-400-002	Installation of the Indicator Light
AMM 52-36-18-000-001	Removal of the Door Actuator
AMM 52-36-18-000-002	Removal of the Proximity Switch
AMM 52-36-18-400-001	Installation of the Door Actuator
AMM 52-36-18-400-002	Installation of the Proximity Switch

3. Fault Confirmation
Subtask 52-35-00-710-050-A

A. Open the Aft cargo compartment-door (referred to as cargo door) and look if the related green indicator light is ON AMM 52-30-00-860-001.

4. Fault Isolation
Subtask 52-35-00-810-050-A

A. If the operation shows that the green indicator light does not come ON:

(1) If the green indicator light does not come ON:

Do a check for 28 VDC between:
The LIGHT-AFT DOOR OPEN AND LOCKED [8MJ] connectors 1 and 3 ASM 523501.

(a) If there is 28 VDC:

Replace the LIGHT-AFT DOOR OPEN AND LOCKED [8MJ] AMM 52-35-12-000-002 and AMM 52-35-12-400-002.

(b) If there is no 28 VDC:

Do a check and repair the wiring between:
The LIGHT-AFT DOOR OPEN AND LOCKED [8MJ] connector 1 and GND ASM 523501.

(2) If the green indicator light comes ON:

Release the lamp and if the indicator light stays ON (the proximity switches of the door actuators operate correctly), no more steps are necessary.

(3) If the indicator light goes OFF:

Do a check for 28 VDC between:
The ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] connectors A/A and A/C ASM 523501.

(a) If there is no 28 VDC:

Do a check and repair the wiring between:
The ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] connectors A/A and CB (1MJ) ASM 523501 or
The ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] connectors A/C and GND ASM 523501.

(b) If there is 28 VDC:

Do a check for 28 VDC between:
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connectors A/A and A/C ASM 523501.

1 If there is no 28 VDC:

Do a check for continuity between:
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connectors A/A and the ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] connectors A/B ASM 523501.

a If there is continuity:

Make an electrical connection between:
The ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] connectors A/A and A/B ASM 523501
Do a check for 28 VDC between:
The ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] connectors A/B and A/C ASM 523501.

If there is 28 VDC:
Replace the ACTUATOR-AFT CARGO DOOR, FWD [2505MJ] AMM 52-36-18-000-001 and AMM 52-36-18-400-001
Replace the proximity switch AMM 52-36-18-000-002 and AMM 52-36-18-400-002.

If there is no 28 VDC:
Do a check and repair the wiring between:
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connector A/C and GND ASM 523501.

2 If there is 28 VDC:

Make an electrical connection between:
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connectors A/A and A/B ASM 523501
Do a check for 28 VDC between:
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connectors A/B and A/C ASM 523501.

a If there is 28 VDC:

b If there is no 28 VDC:

Do a check and repair the wiring between:
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connector A/B and LIGHT-AFT DOOR OPEN AND LOCKED [8MJ] connector 2 ASM 523501 or
The ACTUATOR-AFT CARGO DOOR, AFT [2506MJ] connector A/C and GND ASM 523501.

Subtask 52-35-00-710-051-A

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

5. Close-up
Subtask 52-35-00-860-050-A

A. Put the system back to the serviceable condition.

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