Installation of the Latching Shaft Assembly

TASK 52-31-21-400-012-A
Installation of the Latching Shaft Assembly

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	Torque wrench: range to between 3.7 and 2.8 m.N (32.74 and 24.78 lbf.in )
No specific	Torque wrench: range to between 4.8 and 3.7 m.N (42.48 and 32.74 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(Material No.12ABB1)	Corrosion Preventive Compound-Water Displacing Hard Film -
(Material No.12ABC1)	Corrosion Preventive Compound_Water Displacing Soft Film -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
825	FORWARD CARGO COMPARTMENT DOOR
825AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
41	COTTER PIN	AIPC 52-31-21-34-150
172	COTTER PIN	AIPC 52-31-21-34-240
41	COTTER PIN	AIPC 52-31-82-40-150
41	COTTER PIN	AIPC 52-31-82-44-160
172	COTTER PIN	AIPC 52-31-82-44-230

E. 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 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-31-00-720-001-A	Functional Check of Forward Cargo Compartment Door, Comprising Functional Checks of Locking Mechanism, Interlock Mechanism, Drift Pin Mechanism and Safety Mechanism
TASK 52-31-11-820-002-A	Adjustment of the Door Mechanism
TASK 52-35-13-400-002-A	Installation of the Proximity Switches
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
Access Cover and Protection Plugs ** ON A/C NOT FOR ALL
Access Cover and Protection Plugs ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-31-21-860-066-A

A. Aircraft Maintenance Configuration
(1) Make sure that the FWD cargo-compartment door (referred to as cargo door) is opened and safetied with the actuator safety locks. (Ref. AMM TASK 52-30-00-860-001).
(2) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position below the opened cargo door.
(3) Make sure that the access panel 825AR is removed from the cargo door.

Subtask 52-31-21-865-081-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 52-31-21-910-063-A

A. Preparation for the Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Apply a layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to all moveable parts.
(5) If removed, install the target (35) on the control lever (34) (Ref. AMM TASK 52-35-13-400-002).

Subtask 52-31-21-420-074-A ** ON A/C NOT FOR ALL

B. Installation of the Latching Shaft

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

(1) Install the latching shaft (171) on the cargo door as follows:
(a) Move the latching shaft (171) through the lateral cutout of the cargo door into the sliding bearing of each frame fork end.
(b) During this movement, assemble the shaft levers (175), the link lever (40), the interlock cam (186) and the control lever (190) in the correct sequence on the latching shaft (171).
(c) Put the shaft levers (175), the link lever (40), the interlock cam (186) and the control lever (190) in the correct position on the latching shaft (171) (in accordance with your marks).
(d) Make sure that the attachment holes align.
(e) Install the tapered pins (174), the sleeves (176) and the nuts (177) to attach the shaft levers (175) on the latching shaft (171).
(f) Install the tapered pins (183), the sleeves (184) and the nuts (185) to attach the link lever (40) on the latching shaft (171).
(g) Install the tapered pins (186), the sleeves (189) and the nuts (188) to attach the interlock cam (186) on the latching shaft (171).
(h) Install the tapered pins (191), the sleeves (193) and the nuts (192) to attach the control lever (190) on the latching shaft (171).
(i) Tighten the nuts (177), (185), (188) and (192).
(2) Connect the link rod (181) of each latching unit to the shaft lever (175) as follows:
(a) Put the eye-end of the link rod (181) to the fork-end of the shaft levers (175).
(b) Install the bolt (178), the washers (179), the bushes (180) and (181) and the nut (173).
(c) Tighten the nut (173) and safety it with the new AIPC 52-31-21-34-240 COTTER PIN (172) or AIPC 52-31-82-44-230 COTTER PIN (172).
(3) Connect the connection rod (44) to the link lever (40) as follows:
(a) Put the fork-end of the connection rod rod (44) to the link lever (40).
(b) Install the bolt (45), the washers (43) and the nut (42).
(c) Tighten the nut (42) and safety it with the new cotter pin (41).
(d) Tighten the nut (42) and safety it with the new AIPC 52-31-21-34-150 COTTER PIN (41) or AIPC 52-31-82-44-160 COTTER PIN (41).

Subtask 52-31-21-420-074-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.

B. Installation of the Latching Shaft

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

(1) When you connect/install the components, refer to the marks that you made during the removal procedure.
(2) Install the latching shaft (171) on the cargo door:
(a) Move the latching shaft (171) through the lateral cutout of the cargo door into the sliding bearing of each frame fork-end.
(b) During the movement of the latching shaft (171), install the components that follow in the correct sequence:

The shaft levers (175)
The link lever (40)
The interlock cam (186), and
The control lever (190).

(c) Make sure that the attachment holes of the components align with the attachment holes of the latching shaft (171).
(d) Install the tapered pins (174), the sleeves (176) and the nuts (177) on the shaft levers (175).
(e) Install the tapered pin (183), the sleeve (184) and the nut (185) on the link lever (40).
(f) Install the tapered pins (187), the sleeves (189) and the nuts (188) on the interlock cam (186) and the control lever (190).
(g) TORQUE the nuts (177), (185) and (188) to between 4.8 and 3.7 m.N (42.48 and 32.74 lbf.in )

.
(3) Connect the link rods (181) to the shaft levers (175):
(a) Install the bushes (180) and (182) on the shaft levers (175).
(b) Put the eye-end of the link rods (181) on the fork-end of the shaft levers (175).
(c) Install the washers (179), the bolts (178) and the nuts (173) and (191).
(d) Tighten the nuts (173).
(e) TORQUE the nut (191) to between 3.7 and 2.8 m.N (32.74 and 24.78 lbf.in )

.
(f) Safety the nuts (173) and (191) with the new AIPC 52-31-82-44-230 COTTER PIN (172).
(4) Connect the connection rod (44) to the link lever (40):
(a) Put the fork-end of the connection rod (44) on the link lever (40).
(b) Install the washers (43), the bolt (45) and the nut (42).
(c) Tighten the nut (42) and safety it with the new AIPC 52-31-82-40-150 COTTER PIN (41).

Subtask 52-31-21-820-061-A

C. Adjustment Procedure
(1) Make sure that the upper dead center of the latching mechanism is correctly adjusted (Ref. AMM TASK 52-31-11-820-002).
(2) Make sure that the proximity switch 5MJ is correctly adjusted (Ref. AMM TASK 52-35-13-400-002).

Subtask 52-31-21-720-060-A

D. Test Procedure
(1) Do a functional test to make sure that the latching mechanism operates satisfactorily (Ref. AMM TASK 52-31-00-720-001).
(2) Do the functional test to make sure that the proximity switch 5MJ is correctly adjusted (Ref. AMM TASK 52-31-00-720-001).

5. Close-up
Subtask 52-31-21-865-082-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

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 52-31-21-410-070-A

B. Close Access

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

(1) Make sure that the work area is clean and clear of tools and other items.
(2) Apply Corrosion Preventive Compound_Water Displacing Soft Film - (Material No.12ABC1) or Corrosion Preventive Compound-Water Displacing Hard Film - (Material No.12ABB1) to all the components of the latching shaft assembly and to the adjacent cargo door structure.
(3) Install the protection plug (7) in the edge member and apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) .
(4) Install the access panel 825AR on the cargo door.
(5) Remove the actuator safety locks and close the cargo door (Ref. AMM TASK 52-30-00-860-002).

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