Check of the Voltage at the Nose Wheel Steering Feedback Sensor

TASK 32-51-19-220-001-A
Check of the Voltage at the Nose Wheel Steering Feedback Sensor

FIN: 3GC
FIN: 4GC

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

REFERENCE	QTY	DESIGNATION
No specific	AR	VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ
No specific	AR	WARNING NOTICE(S)
F26792000	1	SENSOR-VOLTAGE TEST
F26792000-1	1	SENSOR-VOLTAGE TEST

B. Referenced Information

REFERENCE	DESIGNATION
TASK 07-11-00-581-003-A	Lifting of the Aircraft at the Forward Jacking Point, MLG Wheels on the Ground
TASK 07-11-00-586-001-A	Lowering of the Aircraft at Forward Jacking Point, MLG Wheels on the Ground
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 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 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 32-51-00-720-003-A	Functional Test of the Nose Wheel Steering with the Handwheel
TASK 32-51-00-820-002-A	Adjustment of the N/WS Zero Position with Adjusting Tool F26630200 for A/C with N/WS Feedback Sensor-Box P/N C24763000, NLG Centering Cams as Reference
TASK 32-51-00-820-002-A-01	Adjustment of the N/WS Zero Position with Tool M46196-100 for A/C with N/WS Feedback Sensor-Box P/N C24763000, NLG Centering Cams as Reference
TASK 32-51-00-820-002-A-02	Adjustment of the N/WS Zero Position for A/C with N/WS Feedback Sensor-Box P/N E21336000, NLG Centering Cams as Reference

3. Job Set-up
Subtask 32-51-19-941-052-A

A. Safety Precautions.
(1) In the cockpit, on the center pedestal, make sure that the free-fall extension handle of the landing gear is in the normal position.
(2) In the cockpit, on the panel 400VU, put the WARNING NOTICE(S) in position to tell persons not to operate the landing gear control lever.
(3) Put the WARNING NOTICE(S) in position to tell persons not operate the nose wheel steering system:

on the brake pedals,
on the nose-wheel steering handwheel.

Subtask 32-51-19-860-052-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Jack up the front of the aircraft (Ref. AMM TASK 07-11-00-581-003).

NOTE: In the fully extended position of the shock absorber, the NLG is automatically centered (the nose wheel steering is in the zero position).

(2) On the nose gear leg, on the electrical box 5GC, make sure that the towing lever is in the normal (engaged) position.
(3) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001).
(4) Make sure that the aircraft electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-51-19-860-052-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Jack up the front of the aircraft (Ref. AMM TASK 07-11-00-581-003).

NOTE: In the fully extended position of the shock absorber, the NLG is automatically centered (the nose wheel steering is in the zero position).

(2) On the nose gear leg, on the electrical box 5GC, make sure that the towing lever is in the normal (engaged) position.
(3) Make sure that the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-10-00-864-002).
(4) Make sure that the aircraft electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).

4. Procedure
Subtask 32-51-19-220-050-A

A. Check of the Voltage at the Sensor Connector
(1) Disconnect the electrical connector 3GC-A (4GC-A) from the sensor 3GC (4GC).
(2) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST between the connector of the sensor 3GC (4GC) and the connector 3GC-A (4GC-A).
(3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(4) Connect a VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ to the SECONDARY VOLTAGE connections on the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST.
(5) Check of the play on the NLG cams
(a) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST, set the selector switch to U1.
(b) Manually move the wheels in steering mode on the RH stop. Record the voltage U1.
(c) Manually move the wheels in steering mode on the LH stop. Record the voltage U1'.
(d) From the voltage U1 and U1', calculate the average voltage U1".
(e) Manually move the wheels in steering mode to get the voltage U1".

NOTE: The angular travel of the nose wheels includes the NLG cam play and the NLG torque link play.

(6) Check of the voltage

NOTE: Do not move the wheels manually in steering mode when you do a check of the voltage.
This can cause an incorrect voltage indication.

(a) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST set the selector switch to U1.
(b) Record the voltage U1
(c) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST set the selector switch to U2.
(d) Record the voltage U2
(e) From the voltage U1 and U2, calculate the voltage U:
U = U1 - U2
(7) This voltage U must not be more than 20mV/AC
(8) If the voltage U is more than 20 mV/AC adjust the nose wheel steering gearbox with the NLG centering cams as reference (Ref. AMM TASK 32-51-00-820-002).
(9) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(10) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST and connect the connector 3GC-A (4GC-A) to the sensor 3GC (4GC).

Subtask 32-51-19-720-050-A

B. Functional Test
(1) Do a functional test of the nose wheel steering with the handwheel (Ref. AMM TASK 32-51-00-720-003).

5. Close-up
Subtask 32-51-19-581-050-A

A. Lower the aircraft to the ground (Ref. AMM TASK 07-11-00-586-001).

Subtask 32-51-19-942-051-A

B. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:51:28 UTC