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

TASK 32-12-15-000-001-A
Removal 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.

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 2M (6 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
98DNSA20208040	1	RIGGING PIN

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB, 196BB

C. 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 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 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 32-12-00-010-001-A	Open the Main Gear Doors for Access
Control-Unit - MLG Door Ground-Opening

3. Job Set-up
Subtask 32-12-15-860-050-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(3) Move the handle of the applicable MLG door control-unit to the closed position.
(4) Depressurise the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).

Subtask 32-12-15-010-051-A

B. Get Access
(1) Open the access panel 195BB ( 196BB).
(2) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).

Subtask 32-12-15-941-051-A

C. Safety Precautions
(1) Obey the flight configuration precautions (Ref. AMM TASK 32-00-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position.
(3) Put the WARNING NOTICE(S) 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 32-12-15-865-053-A

D. Open, safety and tag 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

4. Procedure
Subtask 32-12-15-020-050-A

A. Removal 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) Put the 98DNSA20208040 RIGGING PIN through the actuating lever and into the bypass valve 2517GM (2518GM).
(2) Remove and discard the lockwire from the locknut (3).
(3) Loosen the locknut (3).
(4) Remove and discard the cotter pin (6).
(5) Remove the nut (7), the washer (8) and disconnect the angle joint (4) from the support (5).
(6) Disengage the control cable (2) from the bracket (1) and move it away from the control unit (11).
(7) Remove the bolts (9), the washers (10) and remove the control unit (11).

[Rev.10 from 2021] 2026.04.01 00:41:26 UTC