Removal of the Latching Unit

TASK 52-31-21-000-013-A
Removal of the Latching Unit

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
Latching Unit

3. Job Set-up
Subtask 52-31-21-010-071-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 opened the cargo door.
(3) Remove the access panel 825AR from the cargo door.

Subtask 52-31-21-865-083-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

4. Procedure
Subtask 52-31-21-020-074-A

A. Removal of the Latching Units
(1) Move the latching units of the opened cargo door to the latched position as follows:
(a) Press the roller lever of the interlock mechanism outboard to release the blockage of the latching shaft.
(b) Move the latching handle to the locked position and push it into the recess of the door structure.
(2) Remove the nut (202), the washer (201) and thetravel limit bolt (217) from the cargo door frame.
(3) Disconnect the latching hook (210) from the cargo door frame as follows:
(a) Remove and discard the cotter pin (206) from the nut (207).
(b) Remove the nut (207), the washers (208) and the latching hook bolt (212) from the door frame and let the latching hook (210) hang down.
(4) Disconnect the bellcrank (215) from the cargo door frame as follows:
(a) Remove and discard the cotter pin (203) from the nut (204).
(b) Remove the nut (204), the washers (205) and the bolt (213) from the door frame.
(5) Disconnect the bellcrank rod (181) from the link lever (175) as follows:
(a) Remove and discard the cotter pin (172) from the nut (173).
(b) Remove the nut (173), the washers (179), the bushes (182) and 180) and the bolt (178) from the link lever (175).
(6) Remove the latching unit from the cargo door.
(7) If necessary, remove the bushes (209) and (216) from the cargo door frame.
(8) If necessary, remove the sleeve (211) from the latching hook (210).

Subtask 52-31-21-020-075-A

B. Disassembly of the Latching Unit
(1) Disconnect the latching hook (210) from the bellcrank lever (234) as follows:
(a) Remove and discard the cotter pin (225) from the nut (226).
(b) Remove the nut (226), the washers (227) and the bolt (231) from the lower fork-end of the bellcrank lever (234).
(c) Remove latching hook (210) from the bellcrank lever (234).
(d) Remove the bushes (228) and (230) from the lower fork end of the linkage (234).
(e) Remove the sleeve (229) from the latching hook (210).
(2) Disconnect the bellcrank (215) from the link rod (181) as follows:
(a) Remove and discard the cotter pin (221) from the nut (22).
(b) Remove the nut (222), the washers (238), the bushes (239) and (241) and the bolt (237).
(c) Disconnect the eye-end of the link rod (181) from the fork-end of the bellcrank (215).
(3) Disconnect the bellcrank (215) from the bellcrank lever (234) as follows:
(a) Remove and discard the cotter pin (223) from the nut (224).
(b) Remove the nut (224), the washers (233) and the bolt (232) from the upper fork-end of the bellcrank lever (234).
(c) Remove the bushes (235) and (236) from the upper fork-end of the bellcrank lever (234).
(d) Remove the bellcrank (215) from the linkage (234).
(e) Remove the sleeve (240) from the bellcrank (215).

[Rev.10 from 2021] 2026.04.02 06:27:54 UTC