Removal of the Latching Shaft Assembly

TASK 52-31-21-000-012-A
Removal of the Latching Shaft Assembly

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.

ZONE: 825

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
825	FORWARD CARGO COMPARTMENT DOOR
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
TASK 52-35-13-000-002-A	Removal of the Proximity Switches
Access Cover and Protection Plugs ** ON A/C NOT FOR ALL
Access Cover and Protection Plugs ** ON A/C NOT FOR ALL
Latching Shaft Assembly ** ON A/C NOT FOR ALL
Latching Shaft Assembly ** ON A/C NOT FOR ALL
Latching Shaft Assembly ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-31-21-010-070-A

A. Get Access

Access Cover and Protection Plugs ** ON A/C NOT FOR ALL

(1) Open the FWD cargo-compartment door (referred to as cargo door) and install 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.
(4) Remove the protection plug (7) from the edge member as necessary.

Subtask 52-31-21-865-080-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 52-31-21-860-068-A

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

4. Procedure
Subtask 52-31-21-020-073-A ** ON A/C NOT FOR ALL

A. Removal of the Latching Shaft

Latching Shaft Assembly ** ON A/C NOT FOR ALL

NOTE: Identify the installation position of the link lever, shaft levers, the control lever and the interlock cam with a mark.

(1) Disconnect the shaft lever (175) from the link rod (181) of each latching unit as follows:
(a) Turn the latching shaft (171) so that you can remove the bolts (178) thru the mounting holes of the door frame.
(b) Remove and discard the cotter pin (172) from the nut (173).
(c) Remove the nut (173), the washers (179), the bushes (180) and (182) and the bolt (178) from the shaft levers (175).
(d) Remove the eye-end of the link rod (181) from the fork- end of the shaft lever (175).
(2) Disconnect the link lever (40) from the connection rod (44) follows:
(a) Turn the latching shaft (171) so that you can remove the bolts (45) thru the mounting holes of the door frame.
(b) Remove and discard the cotter pin (41) from the nut (42).
(c) Remove the nut (42), the washers (43) and the bolt (45) from the link rod (44).
(d) Remove the fork-end of the link rod (44) from the link lever (40).
(3) Remove the locking shaft (171) from the cargo door as follows:
(a) Remove the nuts (177), the sleeves (176) and the tapered pins (174) from each shaft levers (175).
(b) Remove the nuts (185), the sleeves (184) and the tapered pins (183) from the the link lever (40).
(c) Remove the nuts (188), the sleeves (189) and the tapered pins (187) from the interlock cam (186).
(d) Remove the nut (192), the sleeve (193) and the tapered pin (191) from the the control lever (190).
(e) Remove the locking shaft (171) slowly through the lateral cutout of the cargo door.

NOTE: Collect the shaft levers (175), the control lever (190), the link lever (40) and the interlock cam (186) during this movement.

(4) Remove the shaft levers (175), the control lever (190) and the interlock cam (186) while you remove the locking shaft (171) from the cargo door.
(5) If necessary, remove the target from the control lever (190) (Ref. AMM TASK 52-35-13-000-002).

Subtask 52-31-21-020-073-C ** ON A/C NOT FOR ALL

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

A. Removal of the Latching Shaft

Latching Shaft Assembly ** ON A/C NOT FOR ALL

(1) Make match marks on the components that you disconnect/remove to record their connections/positions. This is important for the subsequent installation procedure.
(2) Disconnect the shaft levers (175) from the link rods (181):
(a) Turn the latching shaft (171) to remove the bolts (178) through the mounting holes of the door frame.
(b) Remove and discard the cotter pins (172).
(c) Remove the nuts (173) and (191), the washers (179) and the bolts (178) from the shaft levers (175).
(d) Remove the eye-end of the link rods (181) from the fork-end of the shaft levers (175).
(e) Remove the bushes (180) and (182) from the shaft levers (175).
(3) Disconnect the link lever (40) from the connection rod (44):
(a) Turn the latching shaft (171) to remove the bolt (45) through the mounting holes of the door frame.
(b) Remove and discard the cotter pin (41).
(c) Remove the nut (42), the washers (43) and the bolt (45) from the connection rod (44).
(d) Remove the fork-end of the connection rod (44) from the link lever (40).
(4) Remove the latching shaft (171) from the cargo door:
(a) Remove the nuts (177), the sleeves (176) and the tapered pins (174) from the shaft levers (175).
(b) Remove the nut (185), the sleeve (184) and the tapered pin (183) from the link lever (40).
(c) Remove the nuts (188), the sleeves (189) and the tapered pins (187) from the interlock cam (186) and the control lever (190).
(d) Remove the latching shaft (171) slowly through the lateral cutout of the cargo door.
(e) Collect the shaft levers (175), the control lever (190), the link lever (40) and the interlock cam (186) during this movement.
(5) If necessary, remove the target from the control lever (190) (Ref. AMM TASK 52-35-13-000-002).

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