Functional Test of the Solenoid of the Landing-Gear Safety Valve

TASK 32-31-00-720-005-A
Functional Test of the Solenoid of the Landing-Gear Safety Valve

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.

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	AMMETER - DIGITAL
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SUPPLY - 28 VDC, ELECTRICAL
No specific	1	VOLTMETER - DC
No specific	AR	WARNING NOTICE(S)

B. 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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 32-00-00-081-002-A	Removal of the Safety Devices from the Landing Gear Doors
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-481-002-A	Installation of the Safety Devices on the Landing Gear Doors
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-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
Functional Test of the Solenoid of the Landing-Gear Safety Valve

3. Job Set-up
Subtask 32-31-00-941-082-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the safety devices are installed on the landing gears (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.
Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear system.

(4) Put a WARNING NOTICE(S) on the flap/slat control lever to tell persons not to operate the flap/slat system.

Subtask 32-31-00-010-074-A

B. Get Access
(1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(2) Install the safety devices on the MLG doors (Ref. AMM TASK 32-00-00-481-002).

Subtask 32-31-00-860-087-A

C. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 32-31-00-869-106-A

D. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to operate the LGCIU circuit breakers.
(2) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.

Subtask 32-31-00-865-094-A

E. 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

4. Procedure
Subtask 32-31-00-720-066-A

A. Functional Test of the Solenoid of the Landing-Gear Safety Valve
(1) Disconnect the electrical connector from the solenoid of the landing-gear safety valve.
(2) Install the test equipment that follow, as shown in the circuit diagram:

The SUPPLY - 28 VDC, ELECTRICAL
The VOLTMETER - DC 0 to 50 VDC +/- 1% correct to output
The AMMETER - DIGITAL 0 to 1A +/-1%
The electrical test cable.

(3) Set the supply voltage on the SUPPLY - 28 VDC, ELECTRICAL to zero.
(4) Connect the electrical test cable of the VOLTMETER - DC to the solenoid connector as follows:

Connect the positive (+) pole of the electrical test cable to pin B of the solenoid connector.
Connect the negative (-) pole of the electrical test cable to pin A of the solenoid connector.

CAUTION: MAKE SURE THAT YOU INCREASE THE VOLTAGE IN VERY SMALL INCREMENTS TO KEEP THE AMMETER READING TO A MAXIMUM OF 0.1 AMPERE. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE DIODE CAN OCCUR.

(5) Gradually increase the voltage on the SUPPLY - 28 VDC, ELECTRICAL in very small increments until the AMMETER - DIGITAL shows 0.1A.
(6) Measure and record the voltage shown on the VOLTMETER - DC.
(a) Make sure that the voltage is between 4.0 and 4.5 VDC.
(7) Set the supply voltage on the SUPPLY - 28 VDC, ELECTRICAL to zero.
(8) Change the polarity of the electrical test cable connected to the solenoid connector as follows:

Connect the positive (+) pole of the electrical test cable to pin A of the solenoid connector.
Connect the negative (-) pole of the electrical test cable to pin B of the solenoid connector.

CAUTION: MAKE SURE THAT YOU INCREASE THE VOLTAGE IN VERY SMALL INCREMENTS TO KEEP THE AMMETER READING TO A MAXIMUM OF 0.1 AMPERE. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE DIODE CAN OCCUR.

(9) Gradually increase the voltage on the SUPPLY - 28 VDC, ELECTRICAL in very small increments until the AMMETER - DIGITAL shows 0.1A.
(10) Measure and record the voltage shown on the VOLTMETER - DC.
(a) Make sure that the voltage is between 0.5 and 0.8 VDC.
(11) When you change the polarity of the electrical test cable:
(a) Make sure that the voltage values are changed from 4.0 and 4.5 VDC to 0.5 and 0.8 VDC .

NOTE: This will make sure that the diode operates correctly.

5. Close-up
Subtask 32-31-00-860-088-A

A. Aircraft Maintenance Configuration
(1) Disconnect and remove the electrical cables from the solenoid of the landing-gear safety valve.
(2) Connect the electrical connector to the solenoid of the landing-gear safety valve.

Subtask 32-31-00-869-105-A

B. Ground Configuration
(1) If you did the flight configuration precautions, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).

Subtask 32-31-00-865-095-A

C. 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 32-31-00-710-069-A

D. Operational Test
(1) Do the operational check to make sure that the safety valve closes at 260 knots (Ref. AMM TASK 32-31-00-710-005) or (Ref. AMM TASK 32-31-00-710-005).

Subtask 32-31-00-410-068-A

E. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety devices from the MLG doors (Ref. AMM TASK 32-00-00-081-002).
(3) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).

Subtask 32-31-00-942-085-A

F. Removal of Equipment
(1) Remove the SAFETY BARRIERS.
(2) Remove the WARNING NOTICE(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 00:44:07 UTC