Installation of the MLG Door Ground-Opening Bypass-Valve

TASK 32-31-13-400-001-A
Installation of the MLG Door Ground-Opening Bypass-Valve

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: 147
ZONE: 148
FIN: 2517GM
FIN: 2518GM

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 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.75 and 1.63 m.daN (12.91 and 12.02 lbf.ft )
No specific	Torque wrench: range to between 1.87 and 1.76 m.daN (13.79 and 12.98 lbf.ft )
FOR [2517GM] (BYPASS VALVE-MLG DOOR GROUND OPENING, L)
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
FOR [2518GM] (BYPASS VALVE-MLG DOOR GROUND OPENING, R)
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.03LDA1)	Grease-Hydraulic Systems - -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.12ACC1)	Corrosion Preventive Compound-Heavy Duty Soft Film -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
29	COTTER PIN	AIPC 32-31-03-46-070
2	PACKINGS	AIPC 32-31-03-46-110
19	COTTER PIN	AIPC 32-31-03-46-170
19	COTTER PIN	AIPC 32-31-83-42-010
29	COTTER PIN	AIPC 32-31-83-42-010
2	PACKINGS	AIPC 32-31-83-42-190

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
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 32-12-00-820-001-A	Adjustment of the MLG Door Ground-Opening System
TASK 32-31-00-710-002-A	Operational Test of the Landing Gear Doors (With False Targets)
TASK 32-31-00-710-002-A-01	Operational Test of the Landing Gear Doors (Without False Targets)
MLG Door Ground-Opening Bypass-Valve ** ON A/C NOT FOR ALL
MLG Door Ground-Opening Bypass-Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-31-13-941-052-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 the 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.

(4) Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize:

the Green hydraulic system
the Yellow hydraulic system.

Subtask 32-31-13-860-053-A

B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position below applicable zone 147(148).
(2) Make sure that the applicable MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuator.
(4) Make sure that the Yellow and Green hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).
(5) Make sure that the applicable hydraulic reservoir has been depressurized (Ref. AMM TASK 29-14-00-614-001).
(6) Make sure that the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).

4. Procedure
Subtask 32-31-13-560-050-E ** ON A/C NOT FOR ALL

A. Preparation of the Replacement Component

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Remove the protective sleeves from the splines of the shaft (21) of the replacement bypass-valve (6).
(3) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the items that follow:

The splines of the shaft (21) of the replacement bypass-valve (6)
The splines of the bypass levers (9) and (25)
The bolts (8) and (24)
The washers (20) and (26)
The nuts (18) and (27).

(4) Align the master splines of the bypass levers (9) and (25) and install them in the correct position on the shaft (21) of the replacement bypass-valve (6):
(a) Install the bypass lever (9) with the bolt (8), the washer (20) and the nut (18).
(b) Install the bypass lever (25) with the bolt (24), the washer (26) and the nut (27).
(5) Safety the nut (18) with the new AIPC 32-31-03-46-170 COTTER PIN (19) or AIPC 32-31-83-42-010 COTTER PIN (19).
(6) Safety the nut (27) with the new AIPC 32-31-03-46-070 COTTER PIN (29) or AIPC 32-31-83-42-010 COTTER PIN (29).
(7) Apply Corrosion Preventive Compound-Heavy Duty Soft Film - (Material No.12ACC1) to the nuts (18) and (27) and the ends of the bolts (8) and (24).
(8) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Grease-Hydraulic Systems - - (Material No.03LDA1) to the new AIPC 32-31-03-46-110 PACKINGS (2) or AIPC 32-31-83-42-190 PACKINGS (2).
(9) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the unions (3).
(10) Install the packings (2) on the unions (3).
(11) Remove the PLUG - BLANKING from the bypass-valve (6) and install the unions (3).
(12) TORQUE the unions (3) to between 1.87 and 1.76 m.daN (13.79 and 12.98 lbf.ft )

.
(13) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-31-13-560-050-F ** ON A/C NOT FOR ALL

A. Preparation of the Replacement Component

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

The splines of the shaft (21) of the replacement bypass-valve (6)
The splines of the bypass levers (9) and (25)
The bolts (8) and (24)
The washers (20) and (26)
The nuts (18) and (27).

.
(13) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-31-13-420-052-A

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

Subtask 32-31-13-420-050-B

C. Installation of the MLG Door Ground-Opening Bypass-Valve
(1) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (7) and the nuts (28).
(2) Put the bypass-valve (6) in position and install it with the bolts (7) and the nuts (28).
(3) Connect the end-fittings of the hydraulic pipe lines to the bypass-valve (6) as follows:
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) FOR [2517GM] (BYPASS VALVE-MLG DOOR GROUND OPENING, L)
1 Connect the end-fittings (4), (5) and (22) to the unions (3).
2 TORQUE the end fittings (4), (5) and (22) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(c) FOR [2518GM] (BYPASS VALVE-MLG DOOR GROUND OPENING, R)
1 Connect the end-fittings (4), (5) and (23) to the unions (3).
2 TORQUE the end fittings (4), (5) and (23) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(d) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

NOTE: The bypass lever (9) to the control rod (14) and the bypass lever (25) to the flexible control assembly (1) will be connected during Para. 4.D.

Subtask 32-31-13-820-050-A

D. Adjustment of the Door Ground-Opening System
(1) Do the rigging and complete the installation of the MLG door ground-opening system (Ref. AMM TASK 32-12-00-820-001).

Subtask 32-31-13-860-054-A

E. Preparation for Test
(1) Pressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 32-31-13-710-050-A

F. Test
(1) Make sure that the work area is clean and clear of tools and other items.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(2) Do an operational test of the Landing Gear doors (Ref. AMM TASK 32-31-00-710-002).
(3) Do a full DOOR OPEN/DOOR CLOSE cycle five times (Ref. AMM TASK 32-12-00-010-001) and (Ref. AMM TASK 32-12-00-410-001).
(4) Make sure that there is no leakage of hydraulic fluid from the MLG door bypass-valve.

5. Close-up
Subtask 32-31-13-942-050-A

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

[Rev.10 from 2021] 2026.04.01 00:44:22 UTC