Installation of the 1M and 2M Harnesses on the MLG Axle

TASK 32-11-43-400-003-A
Installation of the 1M and 2M Harnesses on the MLG Axle

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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

ZONE: 730
ZONE: 740

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	AR	STRING - DRAW
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04JMD3)	Top Coat Polyurethane-- Decorative External Structure
(Material No.05BAB1)	Threadlocking Adhesive-- Low strength Low viscosity -
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(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. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
730	LEFT MAIN LANDING GEAR & DOORS
740	RIGHT MAIN LANDING GEAR & DOORS

D. Referenced Information

REFERENCE	DESIGNATION
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 32-41-11-000-006-A	Removal of the MLG Wheel
TASK 32-41-11-400-006-A	Installation of the MLG Wheel
TASK 32-42-00-720-002-A	Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON
TASK 32-42-57-000-001-A	Removal of the Tachometer
TASK 32-42-57-400-001-A	Installation of the Tachometer
TASK 32-48-51-000-005-A	Removal of the Fan Assy
TASK 32-48-51-400-005-A	Installation of the Fan Assy
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
ESPM 203300
MLG Axle Harnesses 1M and 2M - Cableform Identification
MLG Axle Harnesses 1M and 2M - Location and Detail

3. Job Set-up
Subtask 32-11-43-941-056-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 32-11-43-869-060-A

B. Flight Configuration Precautions
(1) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-11-43-865-061-A

C. 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
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** 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	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-11-43-860-053-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Make sure that the applicable MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is adjacent to the applicable MLG.
(3) Make sure that the applicable MLG wheels are removed (Ref. AMM TASK 32-41-11-000-006).
(4) Make sure that the applicable tachometers are removed (Ref. AMM TASK 32-42-57-000-001).

Subtask 32-11-43-860-053-B ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Make sure that the applicable MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) is adjacent to the applicable MLG.
(3) Make sure that the applicable MLG wheels are removed (Ref. AMM TASK 32-41-11-000-006).
(4) Make sure that the applicable brake fan assemblies are removed (Ref. AMM TASK 32-48-51-000-005).
(5) Make sure that the applicable tachometers are removed (Ref. AMM TASK 32-42-57-000-001).

4. Procedure

WARNING: MAKE SURE THAT THE INSTALLATION AND ROUTING OF ALL ELECTRICAL CABLES AGREE WITH THE REQUIREMENTS OF THE ELECTRICAL STANDARD PRACTICES MANUAL.

Subtask 32-11-43-420-076-A

A. Preparation for Installation

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

(1) Clean the component interfaces and the adjacent areas 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) Make sure that all the electrical connections are clean and in the correct condition.
(5) Make sure that the 1M and 2M harnesses are in correct condition ESPM 203300.

Subtask 32-11-43-420-077-C

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.

CAUTION: MAKE SURE THAT ALL ELECTRICAL CONNECTORS ARE IDENTIFIED WITH THEIR FIN NO. TO CORRECTLY CONNECT EACH PLUG TO ITS RELATED RECEPTACLE. INCORRECT CONNECTION OF THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO THE AIRCRAFT ELECTRICAL SYSTEM.

B. Installation of the 1M and 2M Harnesses on the MLG Axle

NOTE: Make sure that there are no kinks in the 1M and 2M harnesses.

MLG Axle Harnesses 1M and 2M - Cableform Identification

(1) Identify the positions of the three cableforms at the end of each harness.
(2) If necessary, attach a STRING - DRAW to each applicable cableform at the cable access holes.
(3) Pull the draw strings through the axle, one at a time, to put the cableforms in position. Remove the draw strings.

NOTE: Make sure that there are no kinks in the cableforms when they are put in position.

(4) Remove the CAP-BLANKING from each electrical connector and receptacle.
(5) For the 1M harness:

MLG Axle Harnesses 1M and 2M - Location and Detail

(a) Connect the electrical plug (3) to the 1M harness electrical connector (2).
(6) For the 2M harness:
(a) Make sure that the 2M harness is not caught between the cable clamp (6) and the axle.
(b) Put the cable clamp (6) in position and install with the washers (5) and the bolts (4).

(c) Safety the bolts (4) together with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(d) Connect the electrical connector (7) to the 2M harness electrical connector (8).
(7) Do the steps that follow:

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

(a) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the backshells of all the electrical connectors that you removed.
(b) Make a mark on the backshells of all the electrical connectors that you removed with red Top Coat Polyurethane-- Decorative External Structure (Material No.04JMD3) .
(c) Apply a layer of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) to all the bolts, screws and washers you installed.

Subtask 32-11-43-410-065-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable tachometers (Ref. AMM TASK 32-42-57-400-001).
(3) Install the applicable MLG wheels (Ref. AMM TASK 32-41-11-400-006).
(4) Remove the access platform(s).
(5) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 32-11-43-410-065-B ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable tachometers (Ref. AMM TASK 32-42-57-400-001).
(3) Install the applicable brake fan assemblies (Ref. AMM TASK 32-48-51-400-005).
(4) Install the applicable MLG wheels (Ref. AMM TASK 32-41-11-400-006).
(5) Remove the access platform(s).
(6) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 32-11-43-865-062-A

D. 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
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** 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	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-11-43-740-053-A

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

Subtask 32-11-43-720-054-A

F. Functional 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 tachometers (Ref. AMM TASK 32-42-00-720-002).

5. Close-up
Subtask 32-11-43-942-057-A

A. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the SAFETY BARRIER(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 00:40:59 UTC