Installation of the Control Units that Open/Close the MLG Doors

TASK 32-12-15-400-001-A
Installation of the Control Units that Open/Close the MLG Doors

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

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

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in )
No specific	Torque wrench: range to between 0.66 and 0.54 m.daN (58.41 and 47.79 lbf.in )
No specific	Torque wrench: range to between 3.15 and 2.85 m.daN (23.23 and 21.02 lbf.ft )
98DNSA20208040	1	RIGGING PIN

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06AAC1)	Polysulfide Sealant-General Purpose Interfay -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
6	COTTER PIN	AIPC 32-12-16-01-015
6	COTTER PIN	AIPC 32-12-16-02-015

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 29-23-00-860-002-A	Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 32-00-00-860-001-A	Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01	Flight Configuration Precautions without Electrical Power
TASK 32-00-00-860-002-A	Ground Configuration after Flight Configuration with Electrical Power
TASK 32-00-00-860-002-A-01	Ground Configuration after Flight Configuration without Electrical Power
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
Control-Unit - MLG Door Ground-Opening

3. Job Set-up
Subtask 32-12-15-860-051-A

A. Aircraft Maintenance Configuration
(1) Make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002) or the flight configuration precautions were obeyed (Ref. AMM TASK 32-00-00-860-001).
(2) Make sure that the PTU isolation coupling is disconnected (Ref. AMM TASK 29-23-00-860-001).
(3) Make sure that the handle of the new MLG door control-unit is in the closed position.
(4) Make sure that the 98DNSA20208040 RIGGING PIN is in position through the actuating lever and into the bypass valve 2517GM (2518GM).
(5) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(6) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Green hydraulic system:

On the panel 40VU in the cockpit,
On the ground service panel of the Green hydraulic system.

Subtask 32-12-15-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33

4. Procedure
Subtask 32-12-15-420-050-A

A. Installation of the Control Unit

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (9) and the washers (10).
(5) Apply Polysulfide Sealant-General Purpose Interfay - (Material No.06AAC1) to the interface of the control unit (11).
(6) Put the control unit (11) in position and install the washers (10) and the bolts (9).
(7) Apply corrosion protection to the heads of the bolts (9) (Ref. AMM TASK 51-75-13-916-002).
(8) Put the control cable (2) in position in the bracket (1). Make sure that the bracket (1) is between the washers (12).
(9) TORQUE the locknut (3) to between 3.15 and 2.85 m.daN (23.23 and 21.02 lbf.ft )

.
(10) Safety the locknut (3) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-12-15-820-050-A

B. Check of the Adjustment of the Door Ground-Opening Control

(1) Put the angle joint (4) in position at the support (5). If necessary adjust the position of the angle joint (4) as follows:
(a) Remove and discard the lockwire from the locknut (14).
(b) Loosen the locknut (14).
(c) Adjust the angle joint (4) until you can connect it to the support (5).
(d) TORQUE the locknut (14) to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in )

.
(2) Make sure that the angle joint (4) is in safety.
(3) If the angle joint (4) is not in safety:
(a) Loosen the locknuts (14) and (15).
(b) Remove the angle joint (4) from the support (5) and turn it until it is in safety.
(c) Turn the swivel end assembly (13) until you can connect the angle joint (4) to the support (5).
(d) TORQUE the locknut (14) to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in )

.
(e) Make sure that the angle joint (4) is in safety.
(f) Make sure that the inner cable of the cable assembly (2) is between the two inspection holes of the swivel end assembly (13).
(g) TORQUE the locknut (15) to between 0.66 and 0.54 m.daN (58.41 and 47.79 lbf.in )

.
(4) Connect the angle joint (4) to the support (5) and install the washer (8) and the nut (7).
(5) Safety the nut (7) with a new AIPC 32-12-16-01-015 COTTER PIN (6) or a new AIPC 32-12-16-02-015 COTTER PIN (6).
(6) Safety the locknut (14) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(7) Remove the rigging pin from the bypass valve 2517GM (2518GM).

Subtask 32-12-15-865-054-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33

Subtask 32-12-15-941-053-A

D. Preparation for Test
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002)
(2) Move the applicable MLG door control-handle to the open position.
(3) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(4) If the flight configuration precautions were obeyed, put the aircraft back to the serviceable condition (Ref. AMM TASK 32-00-00-860-002).
(5) Remove the WARNING NOTICE(S).
(6) Remove the access platform(s).

Subtask 32-12-15-720-050-A

E. Functional Test
(1) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001). Make sure that the MLG door control-handle can move freely and is clear of the aircraft structure.
(2) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001). Make sure that the MLG door control-handle can move freely and is clear of the aircraft structure.

5. Close-up
Subtask 32-12-15-410-051-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(3) Close the access panel 195BB (196BB).

[Rev.10 from 2021] 2026.04.01 00:41:27 UTC