Installation of the Nose Wheel Steering Feedback Sensor Box P/N E21336000

TASK 32-51-19-400-001-A-01
Installation of the Nose Wheel Steering Feedback Sensor Box P/N E21336000

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

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

CAUTION: IF THE SENSOR BOX HAS P/N E21336000, NEVER REMOVE THE SENSOR FROM THE GEARBOX. THE SENSOR AND THE GEARBOX ARE AN ASSEMBLY THAT YOU MUST NOT DISASSEMBLE ON THE AIRCRAFT. IF YOU REMOVE THE SENSOR FROM THE GEARBOX:

YOU WILL CAUSE DAMAGE TO THE SENSOR BOX
THE ADJUSTMENT OF THE SENSOR BOX WILL NO LONGER BE CORRECT.

ZONE: 711
FIN: 3GC
FIN: 4GC

1. Reason for the Job
Do this procedure when you must install a sensor box P/N E21336000 on the NLG.

NOTE: There is an alternative procedure to replace one of the two nose-wheel steering feedback-sensor-boxes. It is applicable when:

You are away from your main base, and
No jacking equipment is available.
Refer to the related task in this page block.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SPATULA - NON METALLIC
No specific	AR	VOLTMETER - AC, 0-20 V MIN, 0,001 V, 50 TO 2000 HTZ
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.25 and 0.21 m.daN (22.12 and 18.58 lbf.in )
No specific	Torque wrench: range to between 0.4 and 0.35 m.daN (35.40 and 30.97 lbf.in )
F26792000	1	SENSOR-VOLTAGE TEST
F26792000-1	1	SENSOR-VOLTAGE TEST

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03GBB1)	Synthetic Oil base Grease-General Purpose Clay Thickened -
(Material No.03GBC1)	Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. -
(Material No.06ABF1)	Polysulfide Sealant-Fuel Tank Quick Curing -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
711	NOSE GEAR

D. 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 32-51-00-720-003-A	Functional Test of the Nose Wheel Steering with the Handwheel
Sensor Box P/N E21336000
Sensor Box P/N E21336000 - Adjustment

3. Job Set-up
Subtask 32-51-19-860-054-A

A. Aircraft Maintenance Configuration
(1) In the cockpit, on the panel 400VU, make sure that the warning notice is in position to tell persons not to operate the landing gear control lever.
(2) On the CAPT and F/O NWS handwheels and on the brake pedals, make sure that the WARNING NOTICE(S) are in position to tell persons not to operate them.
(3) Make sure that the SAFETY BARRIER(S) are in position.
(4) Make sure that the aircraft is lifted at the forward jacking point (Ref. AMM TASK 07-11-00-581-003).
(5) On the panel 402VU LANDING GEAR CTL & IND PNL, make sure that the A/SKID & N/W STRG switch is set to ON.

Subtask 32-51-19-865-058-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34

4. Procedure
Subtask 32-51-19-560-050-A

A. Preparation of the Replacement Component
(1) Clean the component interfaces and the adjacent area.
(2) Clean the attachment hardware with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and dry with filtered compressed air.
(3) Manually turn the pinion (6). Make sure that it turns without friction point.
(4) Apply Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) or Synthetic Oil base Grease-General Purpose Lithium Thickened Low Temp. - (Material No.03GBC1) to the pinion (6).

Subtask 32-51-19-820-050-A

B. Adjustment of the Electrical 0 degree Position of the Sensor Box
(1) Loosen the knob (11) to release the pushrod (10).
(2) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (13) between the connector (8) and the sensor box (7).
(3) On the panel 121VU REAR C/B PNL, remove the safety clips and the tags and close the circuit breakers 1GG and 3GG.
(4) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(5) 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 (13).
(6) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (13) set the selector switch to U1 and record U1. Then set the selector switch to U2 and record U2.
(7) Turn the pinion (6) until:

-------------------------------------

! U1 = U2 plus or minus 0.01 V !

-------------------------------------

(8) When U1 = U2 plus or minus 0.01 V, push the pushrod (10) and hold it in the pushed position to prevent rotation of the pinion (6).

NOTE: When you lock the pinion (6) with the pushrod (10), the voltage value U1/U2 can change by more than plus or minus 0.01 V. Ignore this, but the value must be less than 0.045 V.

(9) On the panel 121VU REAR C/B PNL, open, safety and tag the circuit breakers 1GG and 3GG.
(10) Disconnect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (13) from the sensor box (7).

Subtask 32-51-19-420-051-A

C. Installation of the Sensor Box (7)
(1) Make sure that the spacers (5) are installed on the sensor box (7).
(2) Install the sensor box (7) on the nose landing gear.
(3) Install the springs (4), the bushes (3), the washers (2) and the screws (1).

CAUTION: DO NOT APPLY FINAL TORQUE AT THIS TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EQUIPMENT CAN OCCUR.

CAUTION: DO NOT USE MORE THAN THE MAXIMUM GIVEN TORQUE TO INSTALL THE SENSOR BOX. THIS IS TO PREVENT EXCESSIVE FRICTION OF THE TEETH OF THE SENSOR BOX, WHICH CAN CAUSE EXCESSIVE TEETH WEAR AND POSSIBLE VEERING OF THE AIRCRAFT. WHEN YOU TORQUE THE BOLTS, OBEY A CROSS SEQUENCE TO MAKE SURE THAT THE TIGHTENING IS SYMETRICAL.

(a) Tighten the screws (1) to compress the springs only.
(4) Release the pushrod (10).
(5) TORQUE the screws (1) to between 0.4 and 0.35 m.daN (35.40 and 30.97 lbf.in )

.
(6) Turn the knob (11).

CAUTION: MAKE SURE THAT YOU CORRECTLY AND FULLY TURN THE KNOB. THIS WILL PREVENT ENGAGEMENT OF THE PUSHROD WITH THE GEAR.

(a) Turn the knob (11) to lock the pushrod (10).
(7) Safety the knob (11) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-51-19-220-051-A

YOU WILL CAUSE DAMAGE TO THE SENSOR BOX
THE ADJUSTMENT OF THE SENSOR BOX WILL NO LONGER BE CORRECT.

D. Check of the Electrical 0 degree Position

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

(1) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (13) on the sensor box (7).
(2) On the panel 121VU REAR C/B PNL, remove the safety clips and the tags and close the circuit breakers 1GG and 3GG.
(3) Measure the secondary voltages U1 and U2.
Make sure that :

-------------------------------------

! U1 = U2 plus or minus 0.02 V !

-------------------------------------

(4) If U1 is not equal to U2 plus or minus 0.02 V, do these steps:
(a) Use a SPATULA - NON METALLIC to remove the sealant:

from the areas identified E
from the housing of the worm screw (12).

NOTE: Do not cause damage to the surface protections of these parts.

(b) Loosen the screws (9) to release the sensor.
(c) Turn the worm screw (12) to get:

-------------------------------------

! U1 = U2 plus or minus 0.02 V !

-------------------------------------

(d) TORQUE the screws (9) to between 0.25 and 0.21 m.daN (22.12 and 18.58 lbf.in )

.
(e) Make sure that U1 = U2 plus or minus 0.02V. If not, do the adjustment again.
(5) On the panel 121VU REAR C/B PNL, open, safety and tags the circuit breakers 1GG and 3GG.
(6) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (13).
(7) Connect the electrical connector (8) to the sensor box (7).

Subtask 32-51-19-914-051-A

E. Apply the Sealant

Sensor Box P/N E21336000

(1) Apply a layer of Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) on the areas identified E.

Sensor Box P/N E21336000

(2) Fill the housing of the worm screw (12) with Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .

Subtask 32-51-19-581-051-A

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

Subtask 32-51-19-865-057-A

G. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34

Subtask 32-51-19-720-051-A

H. 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 32-51-19-862-050-A

A. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-51-19-942-052-A

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

[Rev.8 from Aug 2017] 2026.04.01 00:51:28 UTC