Installation of the MLG Uplock - Support Struts

TASK 32-31-44-400-002-A
Installation of the MLG Uplock - Support Struts

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	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.4 and 1.3 m.daN (123.89 and 115.04 lbf.in )

B. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
21	COTTER PIN	AIPC 32-31-03-22-180
5	COTTER PIN	AIPC 32-31-03-22-180
11	COTTER PIN	AIPC 32-31-03-22-260
19	COTTER PIN	AIPC 32-31-03-22-260
21	COTTER PIN	AIPC 32-31-83-40-070
5	COTTER PIN	AIPC 32-31-83-40-070
11	COTTER PIN	AIPC 32-31-83-40-170
19	COTTER PIN	AIPC 32-31-83-40-170

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
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 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
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 32-31-00-720-002-A	Functional Test of the Normal Extension and Retraction of the Landing Gear
TASK 32-33-00-720-001-A	Functional Check of Free-Fall Extension
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
Rigging of the MLG Uplock Support Struts
MLG Uplock-Support Struts

3. Job Set-up
Subtask 32-31-44-860-054-A

A. Aircraft Maintenance Configuration
(1) Make sure that the PTU isolation coupling is disconnected (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the flight configuration precautions were obeyed (Ref. AMM TASK 32-00-00-860-001).
(4) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(5) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-31-44-865-054-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

Subtask 32-31-44-941-054-A

C. Safety Precautions
(1) 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 32-31-44-560-052-A

D. Preparation of the Replacement Component
(1) Make sure that the dimension "Y" of the new support strut "A" is the same as that retained from the removed component.

Rigging of the MLG Uplock Support Struts

(2) If necessary adjust to "Dimension Y":
(a) Bend back the lockwasher from the eye end-lock nut if it is safetied.
(b) Loosen the eye end-lock nut.
(c) Turn the eye end in or out until the "Dimension Y" is reached.
(d) Tighten the eye end-lock nut and TORQUE to between 1.4 and 1.3 m.daN (123.89 and 115.04 lbf.in )

.
(e) Bend up the lock washer to safety the eye end-lock nut.
(3) Make sure that the dimension "Z" of the new support strut "B" is the same as that retained from the removed component.

Rigging of the MLG Uplock Support Struts

(4) If necessary adjust to "Dimension Z":
(a) Bend back the lockwasher from the eye end-lock nut if it is safetied.
(b) Loosen the eye end-lock nut.
(c) Turn the eye end in or out until the "Dimension Z" is reached.
(d) Tighten the eye end-lock nut and TORQUE to between 1.4 and 1.3 m.daN (123.89 and 115.04 lbf.in )

.
(e) Bend up the lock washer to safety the eye end-lock nut.

4. Procedure
Subtask 32-31-44-420-051-A

A. Installation of the MLG Uplock-Support Struts

MLG Uplock-Support Struts

(1) Install the support strut "A":
(a) Put the support strut "A" (8) in position on the uplock assembly (25).
(b) Install the bolt (6) and the washer assembly (7).
(c) Install the washers (9), (10) and the nut (12).
(d) Safety the nut (12) with a new AIPC 32-31-03-22-260 COTTER PIN (11) or AIPC 32-31-83-40-170 COTTER PIN (11).
(e) Put the eye end in position and install the bolt (1) together with the bush (2).
(f) Install the washer (3) and the nut (4).
(g) Safety the nut (4) with a new AIPC 32-31-03-22-180 COTTER PIN (5) or AIPC 32-31-83-40-070 COTTER PIN (5).
(2) Install the support strut "B":
(a) Put the support strut "B" (15) in position on the uplock assembly (25).
(b) Install the bolt (13) and the washer assembly (14).
(c) Install the washers (16), (17) and the nut (18).
(d) Safety the nut (18) with a new AIPC 32-31-03-22-260 COTTER PIN (19) or AIPC 32-31-83-40-170 COTTER PIN (19).
(e) Put the eye end in position and install the bolt (24) together with the bush (23).
(f) Install the washer (22) and the nut (20).
(g) Safety the nut (20) with a new AIPC 32-31-03-22-180 COTTER PIN (21) or AIPC 32-31-83-40-070 COTTER PIN (21).

Subtask 32-31-44-865-055-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
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 32-31-44-860-055-A

C. Preparation for Test
(1) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(2) If the flight configuration precautions were obeyed, put the aircraft back to the serviceable condition (Ref. AMM TASK 32-00-00-860-002).
(3) Remove the CONTAINER - HYDRAULIC FLUID RESISTANT.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).
(6) Make sure that the work area is clean and clear of tools and other items.
(7) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(8) If necessary, fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).

Subtask 32-31-44-720-051-A

D. Do the Test
(1) Do the functional test of the MLG (Ref. AMM TASK 32-31-00-720-002).
(2) Do the functional test of the free-fall extension system of the MLG (Ref. AMM TASK 32-33-00-720-001).
(3) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that there is no hydraulic fluid leakage from the uplock assembly.

5. Close-up
Subtask 32-31-44-410-052-A

A. Close Access
(1) Apply corrosion protection to the nuts, bolts, washers, hydraulic pipes and adjacent areas (Ref. AMM TASK 51-75-13-916-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the applicable MLG door (Ref. AMM TASK 32-12-00-410-001).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:45:24 UTC