Removal of the Interlock Mechanism

TASK 52-31-21-000-006-A
Removal of the Interlock Mechanism

CAUTION: IMMEDIATELY AFTER YOU OPEN THE CARGO COMPARTMENT DOOR, RECORD ON THE WORK CARD ON THE DOOR, THE DATE AND TIME WHEN YOU OPENED IT. IF THE CARGO COMPARTMENT DOOR STAYS OPEN FOR 12 HOURS OR MORE, YOU MUST BLEED THE HYDRAULIC SYSTEM RELATED TO IT. IF YOU DO NOT OBEY THESE PRECAUTIONS, THE DOOR CAN CLOSE SUDDENLY WHEN YOU SET THE DOOR TO "CLOSE". THIS CAN CAUSE DAMAGE TO THE DOOR AND TO THE AIRCRAFT STRUCTURE.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
825AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Interlock Mechanism ** ON A/C NOT FOR ALL
Interlock Mechanism ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-31-21-010-061-A

A. Get Access
(1) Open the FWD cargo-compartment door (referred to as cargo door) and safety it with the actuator safety locks (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the opened cargo door.
(3) Remove the access panel 825AR from the cargo door.

Subtask 52-31-21-865-065-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
122VU	DOORS/CARGO	1MJ	T12
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 52-31-21-860-054-B ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Move the latching mechanism of the opened cargo door to the locked condition as follows:
(a) Push the roller lever (263) of the interlock mechanism outboard to release the blockage of the latching shaft.
(b) Move the door handle down to the locked position and push it into the recess of the door structure.

Subtask 52-31-21-860-054-C ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Move the latching mechanism of the opened cargo door to the locked condition as follows:
(a) Push the interlock lever (18) of the interlock mechanism outboard to release the blockage of the latching shaft.
(b) Move the door handle down to the locked position and push it into the recess of the door structure.

4. Procedure
Subtask 52-31-21-020-054-B ** ON A/C NOT FOR ALL

A. Removal of the Interlock Mechanism

NOTE: Remove the interlock mechanism which includes the roller lever (263), the interlock lever (269) and the spring pin (268) carefully because the spring (273) is under load.

(1) Disconnect the roller lever (263) from the interlock fitting as follows:
(a) Remove and discard the cotter pin (258) from the nut (259).
(b) Remove the nut (259), the washers (260) and the bolt (265) from the interlock fitting.
(c) Hold the roller lever (263) and remove the sleeve (261) from the interlock fitting.
(d) Move the roller end of the roller lever (263) through the cutout of the cargo door structure inboard.
(2) Disconnect the interlock lever (269) from the interlock fitting as follows:
(a) Remove and discard the cotter pin (252).
(b) Remove the washer (251) and the pin (271) from the interlock fitting.
(c) Remove and discard the cotter pin (253) from the nut (254).
(d) Remove the nut (254), the washers (255), the sleeve (270) and the bolt (267) from the interlock fitting.
(3) Remove the interlock mechanism from the cargo door as follows:
(a) Pull the interlock mechanism (262) down until the interlock lever (269) is free from the interlock fitting.
(b) Remove the interlock mechanism so that the spring pin (268) disengages from the spring sleeve (272).
(4) Remove the spring sleeve (272) from the interlock fitting as follows:
(a) Remove the spring (273) from the spring sleeve (272).
(b) Remove and discard the cotter pin (257).
(c) Remove the pin (266) together with the spacers (264), the spring sleeve (272) and the washer (256) from the interlock fitting.

Subtask 52-31-21-020-054-C ** ON A/C NOT FOR ALL

A. Removal of the Interlock Mechanism
(1) Disconnect the interlock lever (18) from the interlock fitting as follows:
(a) Remove and discard the cotter pin (9).
(b) Remove the nut (8), the washer (7), the bolt (25), the washer (26) and the bush (27).
(c) Remove and discard the cotter pin (10) from the pin (20).
(d) Remove the washer (16) and the pin (20) from the interlock fitting.
(e) Release the retaining ring (6) from the spring bolt (28) and remove the washer (5).
(f) Release the tension springs (4) and (29) and remove the spring bolt (28).
(g) Release the retaining ring (17) from the spring bolt (19).
(h) Release the tension springs (4) and (29) and remove the spring bolt (19).
(2) Pull the interlock mechanism down until the interlock lever (18) is free from the interlock fitting.

[Rev.10 from 2021] 2026.04.02 06:27:52 UTC