Installation of the MLG Disconnection Box

TASK 32-11-46-400-001-A
Installation of the MLG Disconnection Box

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	ACCESS PLATFORM 2M (6 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.05BAB1)	Threadlocking Adhesive-- Low strength Low viscosity -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.12ACB1)	Corrosion Preventive Compound-Heavy Duty Hard Film -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
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 32-42-00-710-001-A	Operational Check of the Normal Braking System
TASK 32-42-00-720-002-A	Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON
TASK 32-47-00-710-001-A	Operational Test of the Brake Temperature System
TASK 32-48-00-710-001-A	Functional Test of The Brake Cooling System
TASK 32-69-00-740-001-A	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
TASK 57-51-42-000-001-A	Removal of the Overwing Panel Protection
TASK 57-51-42-400-001-A	Installation of the Overwing Panel Protection
MLG Disconnection Box ** ON A/C NOT FOR ALL
MLG Disconnection Box ** ON A/C NOT FOR ALL
MLG Disconnection Box ** ON A/C NOT FOR ALL
MLG Disconnection Box ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-11-46-941-051-A

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:

Make sure that the landing-gear control-lever 6GA is in the DOWN position
Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.

Subtask 32-11-46-860-050-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is below the applicable zone 730 or 740.
(2) Make sure that the MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.

Subtask 32-11-46-860-050-B ** ON A/C NOT FOR ALL

Subtask 32-11-46-865-051-A

WARNING: OPEN CIRCUIT BREAKERS 1JH, 2JH1, 2JH2, 3JH1 AND 3JH2 (ENGINE 1 AND 2 IGNITION SYSTEMS). THEN OPEN CIRCUIT BREAKERS 2KS1 AND 2KS2 (FADEC A AND EIU 1 AND 2) AND 4KS1 (FADEC B AND EIU 1). IF YOU DO NOT OBEY THIS SEQUENCE, THE ENGINE AUTOMATIC IGNITION- SYSTEM WILL OPERATE. THIS CAN CAUSE INJURY TO MAINTENANCE PERSONNEL.

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
** ON A/C NOT FOR ALL
49VU	FUEL/XFR VALVE1/WING/R	2QP	A11
49VU	FUEL/XFR VALVE1/WING/L	1QP	A10
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B06
** ON A/C ALL
49VU	FUEL/X FEED/VALVE/MOT1	2QE	A12
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
49VU	HYD/FIRE VALVE/Y/ENG2	3702GD	C14
49VU	HYD/FIRE VALVE/G/ENG1	1703GK	C13
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
49VU	SDAC/1/SPLY	3WV	F04
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B01
** ON A/C NOT FOR ALL
121VU	ENGINE/IGN/ENG2/SYS A BAT	2JH2	P40
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** ON A/C ALL
121VU	HYDRAULIC/BRK/TEMP/DET/UNIT	1GW	M37
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
121VU	HYDRAULIC/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q42
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/BRK FAN/WHEELS/3 AND 4	2GS	L35
121VU	HYDRAULIC/BRK FAN/WHEELS/1 AND 2	1GS	L32
121VU	HYDRAULIC/BRK/FAN/CTL	3GS	M32
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q41
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q40
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31
** ON A/C ALL
122VU	LIGHTING/LANDING LT/R/CTL	4LB	T07
122VU	LIGHTING/LANDING LT/R/SPLY	2LB	T06
122VU	LIGHTING/LANDING LT/L/CTL	3LB	T05
122VU	LIGHTING/LANDING LT/L/SPLY	1LB	T04
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23

4. Procedure
Subtask 32-11-46-420-052-A

A. Preparation for Installation
(1) Do an inspection of the component interfaces and the adjacent area.
(2) 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) .
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Make sure that all the electrical connections are clean and in the correct condition.

Subtask 32-11-46-420-051-C ** ON A/C NOT FOR ALL

B. Installation of the MLG Disconnection Box
(1) Put the MLG disconnection box (16) between the mid and aft beams of the overwing panel Z571 (Z671). Install the MLG disconnection box (16) with the screws (2) (Ref. AMM TASK 20-28-00-912-802).
(2) Carefully move the electrical connections (7), (8) and (12) into their slots in the MLG disconnection box (16).
(3) Remove the CAP - BLANKING from the electrical connectors.
(4) Install the electrical receptacle 4027VC (4028VC) into its retaining plate.
(5) Connect the electrical connector (3) to 4027VC (4028VC) and make sure that the route of the cable (13) is correct. Put the cleat (15) in position and install the screw (14).
(6) Tighten the electrical connections (7), (8) and (12).
(7) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the electrical connectors (3), (7), (8) and (12).
(8) Clean the electrical connectors (3), (7), (8) and (12) with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(9) Apply a continuous layer of Corrosion Preventive Compound-Heavy Duty Hard Film - (Material No.12ACB1) to the electrical connectors (3), (7), (8) and (12).
(10) Connect the bonding straps (10) and install the screws (5) and (6) (Ref. AMM TASK 20-28-00-912-802).
(11) Put the clips (11) in position and install the screws (9).
(12) Put the lid (4) in position and install the screws (1).

Subtask 32-11-46-420-051-D ** ON A/C NOT FOR ALL

B. Installation of the MLG Disconnection Box
(1) Put the MLG disconnection box (16) between the mid and aft beams of the overwing panel Z571(Z671). Install the MLG disconnection box (16) with the screws (2) (Ref. AMM TASK 20-28-00-912-802).
(2) Carefully move the electrical connections (7), (8) and (12) into their slots in the MLG disconnection box (16).
(3) Remove the CAP - BLANKING from the electrical connectors.
(4) Install the electrical receptacle 4027VC (4028VC) into its retaining plate.
(5) Install the electrical receptacle 4031VC (4032VC) into its retaining plate.
(6) Connect the electrical plug (3) to 4027VC (4028VC) and make sure that the route of the cable (13) is correct. Put the cleat (15) in position and install the screw (14).
(7) Tighten the electrical connectors (7), (8) and (12).
(8) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the electrical connectors (3), (7), (8) and (12).
(9) Clean the electrical connectors (3), (7), (8) and (12) with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(10) Apply a continuous layer of Corrosion Preventive Compound-Heavy Duty Hard Film - (Material No.12ACB1) to the electrical connectors (3), (7), (8) and (12).
(11) Connect the bonding straps (10) and install the screws (5) and (6) (Ref. AMM TASK 20-28-00-912-802).
(12) Put the clips (11) in position and install the screws (9).
(13) Put the lid (4) in position and install the screws (1).

Subtask 32-11-46-865-052-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 NOT FOR ALL
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
** ON A/C NOT FOR ALL
49VU	FUEL/XFR VALVE1/WING/R	2QP	A11
49VU	FUEL/XFR VALVE1/WING/L	1QP	A10
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B06
** ON A/C ALL
49VU	FUEL/X FEED/VALVE/MOT1	2QE	A12
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
49VU	HYD/FIRE VALVE/Y/ENG2	3702GD	C14
49VU	HYD/FIRE VALVE/G/ENG1	1703GK	C13
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
49VU	SDAC/1/SPLY	3WV	F04
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B01
** ON A/C NOT FOR ALL
121VU	ENGINE/IGN/ENG2/SYS A BAT	2JH2	P40
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** ON A/C ALL
121VU	HYDRAULIC/BRK/TEMP/DET/UNIT	1GW	M37
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
121VU	HYDRAULIC/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q42
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/BRK FAN/WHEELS/3 AND 4	2GS	L35
121VU	HYDRAULIC/BRK FAN/WHEELS/1 AND 2	1GS	L32
121VU	HYDRAULIC/BRK/FAN/CTL	3GS	M32
** ON A/C NOT FOR ALL
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q41
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q40
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31
** ON A/C ALL
122VU	LIGHTING/LANDING LT/R/CTL	4LB	T07
122VU	LIGHTING/LANDING LT/R/SPLY	2LB	T06
122VU	LIGHTING/LANDING LT/L/CTL	3LB	T05
122VU	LIGHTING/LANDING LT/L/SPLY	1LB	T04
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23

Subtask 32-11-46-720-050-A

D. Test

CAUTION: DURING THE FUNCTIONAL TEST OF THE TACHOMETERS, MAKE SURE THAT THE OPERATION OF THE BRAKE PISTONS IS CORRECT AND AGREES WITH EACH STEP GIVEN IN THIS TEST: INCORRECT OPERATION OF THE BRAKE PISTONS CAN BE CAUSED BY A BAD OR A CROSSED CONNECTION OF THE TACHOMETERS DURING INSTALLATION, AND CAN CAUSE UNSATISFACTORY BRAKING AND/OR A TIRE BURST DURING AIRCRAFT OPERATION.

(1) Do a functional test of the tachometer system (Ref. AMM TASK 32-42-00-720-002).

Subtask 32-11-46-740-050-A

E. Test
(1) Do a BITE test of the MLG system (Ref. AMM TASK 32-69-00-740-001).

Subtask 32-11-46-710-050-B ** ON A/C NOT FOR ALL

F. Test
(1) Do an operational test of the brake temperature system (Ref. AMM TASK 32-47-00-710-001).
(2) Do an operational test of the normal brake system (Ref. AMM TASK 32-42-00-710-001).

Subtask 32-11-46-710-050-D ** ON A/C NOT FOR ALL

F. Test
(1) Do an operational test of the brake cooling system (Ref. AMM TASK 32-48-00-710-001).
(2) Do an operational test of the brake temperature system (Ref. AMM TASK 32-47-00-710-001).
(3) Do an operational test of the normal brake system (Ref. AMM TASK 32-42-00-710-001).

5. Close-up
Subtask 32-11-46-862-050-A

A. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-11-46-410-052-A ** ON A/C NOT FOR ALL

B. 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).

Subtask 32-11-46-410-052-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the overwing panel protection (Ref. AMM TASK 57-51-42-400-001).
(3) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 32-11-46-942-051-A

C. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 12:30:13 UTC