Removal of the Locking Shaft Assembly

TASK 52-31-21-000-011-A
Removal of the Locking 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
Access Cover and Protection Plugs ** ON A/C NOT FOR ALL
Access Cover and Protection Plugs ** ON A/C NOT FOR ALL
Locking Shaft Assembly ** ON A/C NOT FOR ALL
Locking Shaft Assembly ** ON A/C NOT FOR ALL
Locking Shaft Assembly ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-31-21-010-069-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 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 at the cargo door.
(3) Remove the access panel 825AR from the cargo door.
(4) Remove the protection plug (6) from the edge member as necessary.

Subtask 52-31-21-865-077-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 52-31-21-020-072-A ** ON A/C NOT FOR ALL

A. Removal of the Locking Shaft Assembly

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

NOTE: Identify the installation position of the lock cams, the drift pin lever, the control lever and the vent door lever with a mark.

(1) Disconnect the connection rod (159) from the vent door lever (162) as follows:
(a) Remove and discard the cotter pin (164) from the nut (163).
(b) Remove the nut (163), the washers (161) and the bolt (160) from the vent door lever (162).
(c) Remove the lower fork- end of the connection rod (159) from the vent door lever (162).
(2) Disconnect the control rod (156) from the drift pin lever (158) as follows:
(a) Remove and discard the cotter pin (153) from the nut (154).
(b) Remove the nut (154), the washer (155) and the bolt (157) to disconnect the control rod (156) from the drift pin lever (158).
(3) Disconnect the control rod (56) from the locking shaft lever (52) as follows:
(a) Remove and discard the cotter pin (53) from the nut (54).
(b) Remove the nut (54), the washers (55) and the bolt (57) from the locking shaft lever (52).
(c) Remove the lower fork-end of the control rod (56) from the locking shaft lever (52).
(4) Disassemble the different components from the locking shaft (148) as follows:
(a) Remove the nuts (140), the washers (141), the sleeves (142) and the tapered pins (143) from the locking shaft lever (52).
(b) Remove the nuts (152), the washers (151), the sleeves (150) and the tapered pins (149) from the drift pin lever (158).
(c) Remove the nuts (168), the washers (167), the sleeves (166) and the tapered pins (165) from the the vent door lever (162).
(d) Remove the nuts (146), the washers (147) and the Hi-Lok pins (144) from the lock cams (145).
(e) Remove the vent door lever (162) and the locking shaft lever (52) from the end of the locking shaft (148).
(5) Remove the locking shaft (148) from the cargo door structure as follows:
(a) Move the locking shaft (148) slowly through the lateral cutout of the cargo door.

NOTE: Collect the lock cams (145) and the drift pin lever (158) during this movement.

(b) Remove the lock cams (145), the washers (169) and the drift pin lever (158) while you remove the locking shaft (148) from the sliding bearing (of each frame forkend).

NOTE: The washers (169) are only installed at FR25.

Subtask 52-31-21-020-072-C ** ON A/C NOT FOR ALL

A. Removal of the Locking Shaft Assembly

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

NOTE: Identify the installation position of the lock cams, the drift pin lever and the vent door lever with a mark.

(1) Disconnect the connection rod (159) from the vent door lever (162) as follows:
(a) Remove and discard the cotter pin (164) from the nut (163).
(b) Remove the nut (163), the washers (161) and the bolt (160) from the vent door lever (162).
(c) Remove the lower eye-end of the connection rod (159) from the vent door lever (162).
(2) Disconnect the control rod (59) from the locking shaft lever (52) as follows:
(a) Remove and discard the cotter pin (53) from the nut (54).
(b) Remove the nut (54), the washers (55) and the bolt (57) from the locking shaft lever (52).
(c) Remove the lower fork-end of the control rod (59) from the locking shaft lever (52).
(3) Disassemble the different components from the locking shaft (148) as follows:
(a) Remove the nuts (140), the washers (141), the sleeves (142) and the tapered pins (143) from the locking shaft lever (52).
(b) Remove the nuts (168), the washers (167), the sleeves (166) and the tapered pins (165) from the the vent door lever (162).
(c) Remove the nuts (146), the washers (147) and the Hi-Lok pins (144) from the lock cams (145).
(d) Remove the vent door lever (162) and the locking shaft lever (52) from the end of the locking shaft (148).
(4) Remove the locking shaft (148) from the cargo door structure as follows:
(a) Move the locking shaft (148) slowly through the lateral cutout of the cargo door.

NOTE: Collect the lock cams (145) during this movement.

Subtask 52-31-21-020-072-D ** 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 Locking Shaft Assembly

Locking 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 connection rod (159) from the vent door lever (162):
(a) Remove and discard the cotter pin (164).
(b) Remove the nut (163), the washers (161) and the bolt (160) from the vent door lever (162).
(c) Remove the lower eye-end of the connection rod (159) from the vent door lever (162).
(3) Disconnect the control rod (56) from the locking shaft lever (52):
(a) Remove and discard the cotter pin (53).
(b) Remove the nut (54), the washers (55) and the bolt (57) from the locking shaft lever (52).
(c) Remove the lower fork-end of the control rod (56) from the locking shaft lever (52).
(4) Remove the locking shaft (148) from the cargo door:
(a) Remove the nut (140), the washer (141), the sleeve (142) and the tapered pin (143) from the locking shaft lever (52).
(b) Remove the nuts (146) and the hi-lok pins (144) from the lock cams (145).
(c) Remove the nuts (168), the washers (167), the sleeves (166) and the tapered pins (165) from the vent door lever (162).
(d) Remove the locking shaft (148) slowly through the lateral cutout of the cargo door.
(e) Collect the vent door lever (162), the washers (169), the lock cams (145) and the locking shaft lever (52) during this movement.

NOTE: The washers (169) are installed only at FR25.

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