Installation of the Landing Gear Safety-Valve

TASK 32-31-17-400-001-A
Installation of the Landing Gear Safety-Valve

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

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: OBEY THE HYDRAULIC SAFETY PROCEDURES. WORK ON THE HYDRAULIC SYSTEMS CAN BE DANGEROUS.

WARNING: DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.

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

FIN: 49GA

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.4 and 1.2 m.daN (123.89 and 106.19 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.04SAB2)	Varnish Polyurethane-- Marking Structure

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
16	PACKING	AIPC 32-31-17-01-050
15	BACK-UP RING	AIPC 32-31-17-01-060
13	BACK-UP RING	AIPC 32-31-17-01-070
12	SQUARE SEAL	AIPC 32-31-17-01-080
2	PACKING	AIPC 32-31-17-01-100
3	BACK-UP RING	AIPC 32-31-17-01-110
5	BACK-UP RING	AIPC 32-31-17-01-120
6	SQUARE SEAL	AIPC 32-31-17-01-130

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 20-23-21-911-001-A	Removal/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
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 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
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 32-31-00-710-005-A	Operational Check to Ensure Safety Valve Closes at 260 Knots
TASK 32-31-00-710-005-A-01	Operational Check to Ensure Safety Valve Closes at 260 Knots
TASK 32-31-00-710-005-A-02	Operational Check to Ensure Safety Valve Closes at 260 Knots
TASK 32-31-00-710-013-A	Operational Check of the Safety Valve that uses the APU
TASK 32-31-00-710-013-A-01	Operational Check of the Safety Valve that uses the Aircraft Batteries
TASK 32-31-00-710-013-A-02	Operational Check of the Safety Valve that uses the GND PWR Contactor Override Box
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
Landing Gear Safety-Valve 49GA

3. Job Set-up
Subtask 32-31-17-860-051-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 de-energized (Ref. AMM TASK 24-41-00-862-002)
(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 32-31-17-865-052-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 32-31-17-860-052-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 panel 40VU in the cockpit
On the ground service panel of the Green hydraulic system.

Subtask 32-31-17-560-050-A

D. Preparation for Installation

WARNING: USE PROTECTIVE CLOTHING WHEN YOU USE HYDRAULIC FLUID. HYDRAULIC FLUID CAN CAUSE SKIN IRRITATION.

(1) Clean the component interfaces and the adjacent area.
(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) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(5) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new:

4. Procedure
Subtask 32-31-17-420-050-A

A. Installation of the Safety Valve
(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Install the new back-up rings (3) and (15) and the new packings (2) and (16) on the bobbins (4) and (14).
(3) If the bobbins (4) and (14) were removed from the safety valve (7):

Install the new back-up rings (5) and (13) and the new square seals (6) and (12) (Ref. AMM TASK 20-23-21-911-001).

(4) If necessary, install the bobbins (4) and (14) in the safety valve (7).
(5) Put the safety valve (7) in position on the manifold (1) and install the washers (9) and the bolts (10).
(6) TORQUE the bolts (10) to between 1.4 and 1.2 m.daN (123.89 and 106.19 lbf.in )

.
(7) Install the bonding strap (19) to the safety valve (7):

Put the bonding strap (19) in position on the bonding bracket (20) and install the washer (18), the bolt (17) and the nut (21).

(8) Make a mark on the bolts (10) and (17) with Varnish Polyurethane-- Marking Structure (Material No.04SAB2) .
(9) Do a bonding check and protect the bonding strap (19) (Ref. AMM TASK 20-28-00-912-802).
(10) Remove the CAP-BLANKING from each electrical connector and receptacle.
(11) Make sure that all the electrical connections are clean and in the correct condition.
(12) Connect the electrical connector (8) to the safety valve (7).

Subtask 32-31-17-865-051-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 32-31-17-860-053-A

C. Aircraft Maintenance Configuration
(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.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).
(6) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(7) If necessary fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).

Subtask 32-31-17-720-050-A

D. Operational Test
(1) Do the applicable test of the Safety Valve 49GA (7).
(a) Do the operational check of the safety valve (7) (Ref. AMM TASK 32-31-00-710-013) if:

The cause of removal is a hydraulic leak of the safety valve (7).

(b) Do the operational check to ensure the safety-valve closes at 260 kts (Ref. AMM TASK 32-31-00-710-005) if:

The cause of removal is not only a hydraulic leak of the safety valve (7).

(2) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that there is no hydraulic fluid leakage from the safety-valve (7).

5. Close-up
Subtask 32-31-17-410-050-A

A. Close Access
(1) Apply corrosion preventive compound to the heads of the bolts (10) and (17) and the adjacent area (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 right 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 12:31:03 UTC