Inspection and Repair of the MLG 1M and 2M Leg Harnesses

TASK 32-11-00-210-802-A
Inspection and Repair of the MLG 1M and 2M Leg Harnesses

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.

ZONE: 731
ZONE: 741

1. Reason for the Job

NOTE: This procedure is only applicable to the flexible parts of the MLG 1M and 2M leg harnesses.

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
731	L.H MAIN GEAR
741	R.H MAIN GEAR

C. 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 32-11-43-000-001-A	Removal of the 1M and 2M Harnesses from the MLG Leg
TASK 32-11-43-400-002-A	Installation of the 1M and 2M Harnesses on the MLG Leg
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 32-12-14-000-001-A	Removal of the MLG Fixed Fairing Assembly
TASK 32-12-14-400-001-A	Installation of the MLG Fixed Fairing Assembly (That was Removed For Access Only)
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 57-51-37-000-008-A	Removal of the Access Door
TASK 57-51-37-400-008-A	Installation of the Access Door
CMM 321228	(for corrective action)
CMM 321277	(for corrective action)
Inspection of MLG 1M and 2M Leg Harnesses
Inspection of Harnesses
MLG 1M and 2M Leg Harnesses - Dynamic Loops
Types of Damage

3. Job Set-up
Subtask 32-11-00-941-094-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Install the ground safety locks on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU, make sure that:

The landing-gear control lever is in the DOWN position
The WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.

Subtask 32-11-00-865-057-A

B. 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
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 32-11-00-860-070-A

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

Subtask 32-11-00-010-090-A

D. Get Access
(1) If necessary:

Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001)
Open the applicable access door 574AB(674AB) (Ref. AMM TASK 57-51-37-000-008)
Remove the MLG fixed fairing (Ref. AMM TASK 32-12-14-000-001).

(2) Put the ACCESS PLATFORM 2M (6 FT) adjacent to the applicable MLG.

4. Procedure
Subtask 32-11-00-210-083-D ** ON A/C NOT FOR ALL

A. Inspection and Repair of the MLG 1M and 2M Leg Harnesses
(1) Examine the 1M and 2M MLG leg harnesses, look for:

INSPECTION	DAMAGE LIMITS
1.Wrinkles on the heat shrink layer.	Permitted.
2.Bend radius.	Permitted. - The average bend radius must not be less than 100 mm (3.94 in.).
3.Chafing of the heat shrink.	Permitted - Must be less than 5 mm (0.20 in.) in length and 5 mm (0.20 in.) in width - Must not go through more than half of the thickness of the heat shrink layer.
4.Cuts or nicks to the heat shrink.	Not permitted.
5.Compressed steel braid.	Permitted - The length of the compressed area must be less than the harness diameter.
6.Permanent acute kinks or bends.	Not permitted.

(2) Examine the braid strands of 1M and 2M MLG leg harnesses, look for:

INSPECTION	DAMAGE LIMITS
1.Braid strand distortion.	Permitted - The strands must not be broken.
2.Broken braid strands.	If one or more strands are broken, the height and width of the damage: - Must be less than 10% of the harness circumference - Must be a maximum of 5 mm (0.20 in.).
3.Conduit deformation.	Permitted - There is no sign of broken wire or cable in the conduit subassembly - The MLG leg harnesses must be fully serviceable (Ref. AMM TASK 32-69-00-740-001).

(3) If the damage is more than the limits, refer to the applicable CMM that follow for repair procedures:

CMM 321228
CMM 321277.

(4) If necessary, replace the harness (Ref. AMM TASK 32-11-43-000-001) and (Ref. AMM TASK 32-11-43-400-002).

Subtask 32-11-00-210-083-E ** ON A/C NOT FOR ALL

A. Inspection and Repair of the MLG 1M and 2M Leg Harnesses
(1) Examine the 1M and 2M MLG leg harnesses, look for:

INSPECTION	DAMAGE LIMITS
1.Wrinkles on the heat shrink layer.	Permitted.
2.Bend radius.	Permitted. - The average bend radius must not be less than 100 mm (3.94 in.).
3.Chafing of the heat shrink.	Permitted - Must be less than 5 mm (0.20 in.) in length and 5 mm (0.20 in.) in width - Must not go through more than half of the thickness of the heat shrink layer.
4.Cuts or nicks to the heat shrink.	Not permitted.
5.Compressed steel braid.	Permitted - The length of the compressed area must be less than the harness diameter.
6.Permanent acute kinks or bends.	Not permitted.

(2) Examine the braid strands of 1M and 2M MLG leg harnesses, look for:

INSPECTION	DAMAGE LIMITS
1.Braid strand distortion.	Permitted - The strands must not be broken.
2.Broken braid strands.	If one or more strands are broken, the height and width of the damage: - Must be less than 10% of the harness circumference - Must be a maximum of 5 mm (0.20 in.).
3.Conduit deformation.	Permitted - There is no sign of broken wire or cable in the conduit subassembly - The MLG leg harnesses must be fully serviceable (Ref. AMM TASK 32-69-00-740-001).

(3) If the damage is more than the limits, refer to CMM 321277 for repair procedures.
(4) If necessary, replace the harness (Ref. AMM TASK 32-11-43-000-001) and (Ref. AMM TASK 32-11-43-400-002).

5. Close-up
Subtask 32-11-00-410-084-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close/install the items that are opened/removed for access:

Install the MLG fixed fairing (Ref. AMM TASK 32-12-14-400-001)
Close the applicable access door 574AB(674AB) (Ref. AMM TASK 57-51-37-400-008)
Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).

(3) Remove the access platform(s).

Subtask 32-11-00-865-058-A

B. 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 32-11-00-942-095-A

C. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the SAFETY BARRIER(S).
(3) Remove all the fixtures, tools, test and support equipment used during this procedure.

[Rev.10 from 2021] 2026.04.01 00:39:29 UTC