DOC AIRBUS | AMM A320FAdjustment of the N/WS Zero Position for A/C with N/WS Feedback Sensor-Box P/N E21336000 with the Nose-Wheel Alignment Tool
TASK 32-51-00-820-003-A-02
Adjustment of the N/WS Zero Position for A/C with N/WS Feedback Sensor-Box P/N E21336000 with the Nose-Wheel Alignment Tool
Do this Nose Wheel Steering (N/WS) zero position adjustment only in these conditions:
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 32-51-00-941-065-A
Reference Points for the Rear Target ** ON A/C NOT FOR ALL
Reference Points for the Rear Target ** ON A/C NOT FOR ALL
(1) Installation of the front target on the ground.
(b) Open the radome to get access to the first reference point (first point) (Ref. AMM TASK 53-15-11-010-001).
(c) Put the front target in position on the ground, approximately below the first reference point.
(d) Make a mark on the NLG door (second reference point).
(e) Install the laser device on the front target arm. To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the front target on the ground.
1 Point the laser beam to the first reference point.
2 Point the laser beam to the second reference point (mark on the NLG door).
3 Make sure that the laser beam points along the centerline of the first and second reference points. If necessary, adjust the lateral position of the front target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the front target arm.
Be very careful not to move the front target. If the front target moves, do steps (f) and (g) again.
(2) Installation of the rear target on the ground
(b) Make sure that the area below the center and rear sections of the fuselage is clear:
(d) Install the 98F05003000002 TARGET-MEASUREMENT at reference point 12.
(e) Install the laser device on the rear target arm.
To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the rear target on the ground.
1 Point the laser beam to point 11.
2 Point the laser beam to the 98F05003000002 TARGET-MEASUREMENT (installed at point 12).
3 Make sure that the laser beam points along the centerline of points 11 and 12. If necessary, adjust the lateral position of the rear target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the rear target arm.
Be very careful not to move the rear target. If the rear target moves, do steps (f) and (g) again.
(3) Lift the NLG axle.
(a) Put a thick layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) on the pivoting cup of the axle jack.
(b) Lift the NLG axle sufficiently to turn the two wheels (Ref. AMM TASK 07-12-00-582-001).
(5) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(6) Make sure that the nose-wheel steering handwheels and the rudder pedals are in the neutral position.
(7) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
Subtask 32-51-00-860-088-B ** ON A/C NOT FOR ALL
Reference Points for the Rear Target ** ON A/C NOT FOR ALL
Reference Points for the Rear Target ** ON A/C NOT FOR ALL
(1) Installation of the front target on the ground.
(b) Open the radome to get access to the first reference point (first point) (Ref. AMM TASK 53-15-11-010-001).
(c) Put the front target in position on the ground, approximately below the first reference point.
(d) Make a mark on the NLG door (second reference point).
(e) Install the laser device on the front target arm. To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the front target on the ground.
1 Point the laser beam to the first reference point.
2 Point the laser beam to the second reference point (mark on the NLG door).
3 Make sure that the laser beam points along the centerline of the first and second reference points. If necessary, adjust the lateral position of the front target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the front target arm.
Be very careful not to move the front target. If the front target moves, do steps (f) and (g) again.
(2) Installation of the rear target on the ground
(b) Make sure that the area below the center and rear sections of the fuselage is clear:
(d) Install the 98F05003000002 TARGET-MEASUREMENT at reference point 12.
(e) Install the laser device on the rear target arm.
To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the rear target on the ground.
1 Point the laser beam to point 11.
2 Point the laser beam to the 98F05003000002 TARGET-MEASUREMENT (installed at point 12).
3 Make sure that the laser beam points along the centerline of points 11 and 12. If necessary, adjust the lateral position of the rear target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the rear target arm.
Be very careful not to move the rear target. If the rear target moves, do steps (f) and (g) again.
(3) Lift the NLG axle.
(a) Put a thick layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) on the pivoting cup of the axle jack.
(b) Lift the NLG axle sufficiently to turn the two wheels (Ref. AMM TASK 07-12-00-582-001).
(5) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(6) Make sure that the nose-wheel steering handwheels and the rudder pedals are in the neutral position.
(7) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-863-002) or (Ref. AMM TASK 29-24-00-863-001).
Subtask 32-51-00-865-118-A
Subtask 32-51-00-220-069-A ** ON A/C NOT FOR ALL
(2) Disconnect the electrical connector (4) from the N/WS feedback sensor-box (3GC) (1).
(3) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST between the electrical connector (4) and the N/WS feedback sensor-box (3GC) (1).
(4) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
(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 (3).
(6) Make sure that the adjustments are correct.
(a) Measure the secondary voltages U1 and U2 for the N/WS feedback sensor-box (3GC) (1).
Make sure that:
(b) If U1 is not equal to U2 plus or minus 20mV, do these steps:
1 Use a SPATULA - NON METALLIC to remove the sealant from:
(a) Do not remove the screws (2).
(8) Turn the worm screw (5) to get:
(9) TORQUE the screws (2) to between 0.25 and 0.21 m.daN (22.12 and 18.58 lbf.in )
.
(10) Make sure that:
If not, do the adjustment again.
(11) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position.
(12) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3).
(13) Connect the electrical connector (4) to the N/WS feedback sensor-box (3GC) (1).
(14) Apply a layer of Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) on the areas identified S.
(15) Fill the housing of the worm screw (5) with Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .
(16) Do the adjustment procedure again for the N/WS feedback sensor-box (4GC) (monitor channel).
(17) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
Subtask 32-51-00-820-070-A
Subtask 32-51-00-860-089-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 00:51:10 UTC
Adjustment of the N/WS Zero Position for A/C with N/WS Feedback Sensor-Box P/N E21336000 with the Nose-Wheel Alignment Tool
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.
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.
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:
1. Reason for the Job- YOU WILL CAUSE DAMAGE TO THE SENSOR BOX
- THE ADJUSTMENT OF THE SENSOR BOX WILL NO LONGER BE CORRECT.
Do this Nose Wheel Steering (N/WS) zero position adjustment only in these conditions:
- The N/WS feedback sensor-box 3GC(4GC) P/N E21336000 is installed, and
- You use the nose-wheel alignment tool JT2000AIRBUS.
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| 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 ) | |
| 98A09003000001 | 1 | BAR-STEERING,NOSE WHEEL |
| 98F05003000002 | 1 | TARGET-MEASUREMENT |
| F26792000 | 2 | SENSOR-VOLTAGE TEST |
| F26792000-1 | 2 | SENSOR-VOLTAGE TEST |
| JT2000AIRBUS | 1 | TOOL-NOSE WHEEL ALIGNMENT |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03GBB1) | Synthetic Oil base Grease-General Purpose Clay Thickened - |
| (Material No.03HBD9) | Synthetic Ester base Grease-General Purpose Low Temp - |
| (Material No.06ABF1) | Polysulfide Sealant-Fuel Tank Quick Curing - |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 07-12-00-582-001-A | Jacking of the Nose Landing Gear |
| TASK 08-22-00-200-001-A | Precise Leveling |
| 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 29-10-00-863-001-A | Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart |
| TASK 29-10-00-863-002-A | Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart |
| 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 29-23-00-863-001-A | Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump |
| TASK 29-23-00-864-001-A | Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU |
| TASK 29-24-00-863-001-A | Pressurize the Yellow Hydraulic System with the Electric Pump |
| TASK 32-46-00-740-001-A | BITE Test of the BSCU |
| TASK 53-15-11-010-001-A | Opening of the Radome |
| TASK 53-15-11-410-001-A | Closing of the Radome |
Subtask 32-51-00-941-065-A
A. General
(1) In the cockpit, put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear or the N/WS.
(2) On the right-center instrument panel (400VU), make sure that the L/G normal control-lever is in the DOWN position and the A/SKID & N/W STRG switch is in the ON position.
(3) On the nose gear leg, on the N/WS deactivation electrical-box, make sure that the towing lever is in the normal position (engaged position).
(4) Make sure that the N/WS handwheels and the rudder pedals are in the neutral position.
(5) On the rudder-trim parking-brake panel (110VU), make sure that the RUD TRIM indicator shows zero.
Subtask 32-51-00-860-088-A ** ON A/C NOT FOR ALL (1) In the cockpit, put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear or the N/WS.
(2) On the right-center instrument panel (400VU), make sure that the L/G normal control-lever is in the DOWN position and the A/SKID & N/W STRG switch is in the ON position.
(3) On the nose gear leg, on the N/WS deactivation electrical-box, make sure that the towing lever is in the normal position (engaged position).
(4) Make sure that the N/WS handwheels and the rudder pedals are in the neutral position.
(5) On the rudder-trim parking-brake panel (110VU), make sure that the RUD TRIM indicator shows zero.
WARNING:
BE CAREFUL WHEN YOU USE THIS TOOL, BECAUSE IT CONTAINS CLASS 2 LASER EQUIPMENT.
B. Installation of the Nose-Wheel Alignment Tool - DO NOT LOOK DIRECTLY INTO THE BEAM
- DO NOT POINT THE BEAM AT OTHER PERSONS.
Reference Points for the Rear Target ** ON A/C NOT FOR ALL Reference Points for the Rear Target ** ON A/C NOT FOR ALL NOTE: Two reference points are used to put the front target in the correct position on the ground.
(a) Refer to the manufacturer's instructions to assemble the front target. - The first reference point is used to put the front target in position on the ground.
- The first and the second reference points are used to adjust the lateral position of the front target with the laser device of the JT2000AIRBUS TOOL-NOSE WHEEL ALIGNMENT.
(b) Open the radome to get access to the first reference point (first point) (Ref. AMM TASK 53-15-11-010-001).
(c) Put the front target in position on the ground, approximately below the first reference point.
(d) Make a mark on the NLG door (second reference point).
(e) Install the laser device on the front target arm. To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the front target on the ground.
1 Point the laser beam to the first reference point.
2 Point the laser beam to the second reference point (mark on the NLG door).
3 Make sure that the laser beam points along the centerline of the first and second reference points. If necessary, adjust the lateral position of the front target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the front target arm.
Be very careful not to move the front target. If the front target moves, do steps (f) and (g) again.
(2) Installation of the rear target on the ground
NOTE: Two reference points are used to put the rear target in the correct position on the ground.
(a) Refer to the manufacturer's instructions to assemble the rear target. - Point 11 is used to put the rear target in position on the ground.
- Points 11 and 12 are used to adjust the lateral position of the rear target with the laser device of the JT2000AIRBUS TOOL-NOSE WHEEL ALIGNMENT.
To do this, it is necessary to install a measurement target on the aircraft, at point 12 to see the laser beam clearly on the target.
(b) Make sure that the area below the center and rear sections of the fuselage is clear:
- Find reference points 11 and 12 below the fuselage (Ref. AMM TASK 08-22-00-200-001).
(d) Install the 98F05003000002 TARGET-MEASUREMENT at reference point 12.
(e) Install the laser device on the rear target arm.
To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the rear target on the ground.
1 Point the laser beam to point 11.
2 Point the laser beam to the 98F05003000002 TARGET-MEASUREMENT (installed at point 12).
3 Make sure that the laser beam points along the centerline of points 11 and 12. If necessary, adjust the lateral position of the rear target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the rear target arm.
Be very careful not to move the rear target. If the rear target moves, do steps (f) and (g) again.
(3) Lift the NLG axle.
(a) Put a thick layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) on the pivoting cup of the axle jack.
(b) Lift the NLG axle sufficiently to turn the two wheels (Ref. AMM TASK 07-12-00-582-001).
NOTE: You must make sure that the wheel travel is clear because there can be an unwanted movement of the NLG.
(4) Refer to the manufacturer's instructions to install and set the nose-wheel alignment tool. (5) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(6) Make sure that the nose-wheel steering handwheels and the rudder pedals are in the neutral position.
(7) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
WARNING:
BE CAREFUL WHEN YOU USE THIS TOOL, BECAUSE IT CONTAINS CLASS 2 LASER EQUIPMENT.
B. Installation of the Nose-Wheel Alignment Tool - DO NOT LOOK DIRECTLY INTO THE BEAM
- DO NOT POINT THE BEAM AT OTHER PERSONS.
Reference Points for the Rear Target ** ON A/C NOT FOR ALL Reference Points for the Rear Target ** ON A/C NOT FOR ALL NOTE: Two reference points are used to put the front target in the correct position on the ground.
(a) Refer to the manufacturer's instructions to assemble the front target. - The first reference point is used to put the front target in position on the ground.
- The first and the second reference points are used to adjust the lateral position of the front target with the laser device of the JT2000AIRBUS TOOL-NOSE WHEEL ALIGNMENT.
(b) Open the radome to get access to the first reference point (first point) (Ref. AMM TASK 53-15-11-010-001).
(c) Put the front target in position on the ground, approximately below the first reference point.
(d) Make a mark on the NLG door (second reference point).
(e) Install the laser device on the front target arm. To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the front target on the ground.
1 Point the laser beam to the first reference point.
2 Point the laser beam to the second reference point (mark on the NLG door).
3 Make sure that the laser beam points along the centerline of the first and second reference points. If necessary, adjust the lateral position of the front target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the front target arm.
Be very careful not to move the front target. If the front target moves, do steps (f) and (g) again.
(2) Installation of the rear target on the ground
NOTE: Two reference points are used to put the rear target in the correct position on the ground.
(a) Refer to the manufacturer's instructions to assemble the rear target. - Point 11 is used to put the rear target in position on the ground.
- Points 11 and 12 are used to adjust the lateral position of the rear target with the laser device of the JT2000AIRBUS TOOL-NOSE WHEEL ALIGNMENT.
To do this, it is necessary to install a measurement target on the aircraft, at point 12 to see the laser beam clearly on the target.
(b) Make sure that the area below the center and rear sections of the fuselage is clear:
- Find reference points 11 and 12 below the fuselage (Ref. AMM TASK 08-22-00-200-001).
(d) Install the 98F05003000002 TARGET-MEASUREMENT at reference point 12.
(e) Install the laser device on the rear target arm.
To do this, engage the spring-loaded location pin in the first notch.
(f) Adjust the lateral position of the rear target on the ground.
1 Point the laser beam to point 11.
2 Point the laser beam to the 98F05003000002 TARGET-MEASUREMENT (installed at point 12).
3 Make sure that the laser beam points along the centerline of points 11 and 12. If necessary, adjust the lateral position of the rear target.
4 If the lateral distance between these two reference points is more than 10 mm (0.39 in.), do step (f) again.
(g) Remove the laser device from the rear target arm.
Be very careful not to move the rear target. If the rear target moves, do steps (f) and (g) again.
(3) Lift the NLG axle.
(a) Put a thick layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) or Synthetic Oil base Grease-General Purpose Clay Thickened - (Material No.03GBB1) on the pivoting cup of the axle jack.
(b) Lift the NLG axle sufficiently to turn the two wheels (Ref. AMM TASK 07-12-00-582-001).
NOTE: You must make sure that the wheel travel is clear because there can be an unwanted movement of the NLG.
(4) Refer to the manufacturer's instructions to install and set the nose-wheel alignment tool. (5) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(6) Make sure that the nose-wheel steering handwheels and the rudder pedals are in the neutral position.
(7) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-863-002) or (Ref. AMM TASK 29-24-00-863-001).
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 32-51-00-865-119-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY | 4GG | M36 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/CTL | 3GG | M35 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/CTL | 1GG | M34 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY | 2GG | M33 |
D. Open, safety and tag this(these) circuit breaker(s):
Subtask 32-51-00-860-102-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | ENGINE/ENG2/OIL/PRESS | 2EN2 | N42 |
| 121VU | ENGINE/ENG1/OIL/PRESS | 2EN1 | N40 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | OIL/PRESS/ENG2 | 10KC2 | N42 |
| 121VU | OIL/PRESS/ENG1 | 10KC1 | N40 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ENGINE/ENG2/OIL/PRESS/AND REV SNSR/CHAN A | 2EN2 | N42 |
| 121VU | ENGINE/ENG1/OIL/PRESS/AND REV SNSR/CHAN A | 2EN1 | N40 |
E. Safety Precautions
(1) On the center pedestal, on the ENG panel (115VU):
(a) Put a WARNING NOTICE(S) in position to tell persons that the two thrust reverser control-levers are not operational.
(2) Put a WARNING NOTICE(S) in position in the cockpit to tell persons that circuit breakers 2EN1 and 2EN2 are open.
Subtask 32-51-00-860-102-B ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel (115VU):
(a) Put a WARNING NOTICE(S) in position to tell persons that the two thrust reverser control-levers are not operational.
(2) Put a WARNING NOTICE(S) in position in the cockpit to tell persons that circuit breakers 2EN1 and 2EN2 are open.
NOTE: The open status of circuit breakers 2EN1 and 2EN2 makes the engine thrust reversers unserviceable.
E. Safety Precautions
(1) On the center pedestal, on the ENG panel (115VU):
(a) Put a WARNING NOTICE(S) in position to tell persons that the two thrust reverser control-levers are not operational.
(2) Put a WARNING NOTICE(S) in position in the cockpit to tell persons that circuit breakers 10KC1 and 10KC2 are open.
4. Procedure(1) On the center pedestal, on the ENG panel (115VU):
(a) Put a WARNING NOTICE(S) in position to tell persons that the two thrust reverser control-levers are not operational.
(2) Put a WARNING NOTICE(S) in position in the cockpit to tell persons that circuit breakers 10KC1 and 10KC2 are open.
NOTE: The open status of circuit breakers 10KC1 and 10KC2 makes the engine thrust reversers unserviceable.
Subtask 32-51-00-220-069-A ** ON A/C NOT FOR ALL
A. Alignment of the N/WS to the Zero Position with the Nose-Wheel Alignment Tool
(1) Use the nose-wheel alignment tool and the manufacturer's instructions to measure the N/WS position.
(2) Use the rudder-trim control-switch on the rudder-trim parking-brake panel (110VU) to align the nose wheels to the zero position, as shown on the nose-wheel alignment-tool display.
(3) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(4) Wait 30 seconds.
Subtask 32-51-00-220-069-B ** ON A/C NOT FOR ALL (1) Use the nose-wheel alignment tool and the manufacturer's instructions to measure the N/WS position.
(2) Use the rudder-trim control-switch on the rudder-trim parking-brake panel (110VU) to align the nose wheels to the zero position, as shown on the nose-wheel alignment-tool display.
(3) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
(4) Wait 30 seconds.
NOTE: This will decrease the hydraulic pressure and make sure that the nose wheel does not move when the A/SKID & N/W STRG switch is set to OFF.
(5) Monitor the nose-wheel alignment-tool display to make sure that the nose wheels stay at the zero position. NOTE: If the nose wheels move:
- Install the 98A09003000001 BAR-STEERING,NOSE WHEEL on the NLG tow fitting.
- Use the 98A09003000001 BAR-STEERING,NOSE WHEEL to put the nose wheels to the zero position again.
- Remove the 98A09003000001 BAR-STEERING,NOSE WHEEL from the NLG tow fitting.
A. Alignment of the N/WS to the Zero Position with the Nose-Wheel Alignment Tool
(1) Use the nose-wheel alignment tool and the manufacturer's instructions to measure the N/WS position.
(2) Use the rudder-trim control-switch on the rudder-trim parking-brake panel (110VU) to align the nose wheels to the zero position, as shown on the nose-wheel alignment-tool display.
(3) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(4) Wait 30 seconds.
Subtask 32-51-00-220-070-A (1) Use the nose-wheel alignment tool and the manufacturer's instructions to measure the N/WS position.
(2) Use the rudder-trim control-switch on the rudder-trim parking-brake panel (110VU) to align the nose wheels to the zero position, as shown on the nose-wheel alignment-tool display.
(3) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(4) Wait 30 seconds.
NOTE: This will decrease the hydraulic pressure and make sure that the nose wheel does not move when the A/SKID & N/W STRG switch is set to OFF.
(5) Monitor the nose-wheel alignment-tool display to make sure that the nose wheels stay at the zero position. NOTE: If the nose wheels move:
- Install the 98A09003000001 BAR-STEERING,NOSE WHEEL on the NLG tow fitting.
- Use the 98A09003000001 BAR-STEERING,NOSE WHEEL to put the nose wheels to the zero position again.
- Remove the 98A09003000001 BAR-STEERING,NOSE WHEEL from the NLG tow fitting.
B. Do a check and Record the Secondary Voltage at the N/WS Feedback Sensor-Box (4GC) (monitor channel)
(2) Disconnect the electrical connector (4) from the N/WS feedback sensor-box (4GC) (1).
(3) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3) between the electrical connector (4) and the N/WS feedback sensor-box (4GC) (1).
(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 (3).
(5) Make sure that the circuit breakers of the BSCU SYS2 (3GG and 4GG) are open.
(6) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
(7) Record the voltage.
(a) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U1.
(b) Record the AC voltage (U1).
(c) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U2.
(d) Record the AC voltage (U2).
(e) Calculate the algebraic value U:
(8) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position.
(9) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3) from the N/WS feedback sensor-box (4GC) (1).
(10) Connect the electrical connector (4) to the N/WS feedback sensor-box (4GC) (1).
Subtask 32-51-00-865-128-A NOTE: The voltages U1 and U2 are in volts (3V approximately).
NOTE: The wheels must not be moved manually in steering mode during the check of the voltage. This can cause an incorrect voltage indication.
NOTE: It is necessary to record the voltage of the N/WS feedback sensor-box (4GC) to keep a reference of the nose wheel position if a problem occurs during the adjustment of the gearbox.
(1) On the landing-gear control and indicating panel (402VU), make sure that the A/SKID & N/W STRG switch is in the OFF position. (2) Disconnect the electrical connector (4) from the N/WS feedback sensor-box (4GC) (1).
(3) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3) between the electrical connector (4) and the N/WS feedback sensor-box (4GC) (1).
(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 (3).
(5) Make sure that the circuit breakers of the BSCU SYS2 (3GG and 4GG) are open.
(6) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
(7) Record the voltage.
(a) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U1.
(b) Record the AC voltage (U1).
(c) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U2.
(d) Record the AC voltage (U2).
(e) Calculate the algebraic value U:
| ----------------------- |
| ! U = (U1 - U2) ! |
| ----------------------- |
(8) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position.
(9) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3) from the N/WS feedback sensor-box (4GC) (1).
(10) Connect the electrical connector (4) to the N/WS feedback sensor-box (4GC) (1).
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 32-51-00-865-129-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/CTL | 1GG | M34 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY | 2GG | M33 |
D. Open, safety and tag this(these) circuit breaker(s):
Subtask 32-51-00-820-069-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY | 4GG | M36 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/CTL | 3GG | M35 |
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:
E. Set the N/WS Zero Position for the N/WS feedback sensor-box (3GC) - YOU WILL CAUSE DAMAGE TO THE SENSOR BOX
- THE ADJUSTMENT OF THE SENSOR BOX WILL NO LONGER BE CORRECT.
NOTE: The voltages U1 and U2 are in volts (3V approximately).
NOTE: The wheels must not be moved manually in steering mode during the check of the voltage. This can cause an incorrect voltage indication.
NOTE: The adjustment process is very sensitive.
(1) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position. (2) Disconnect the electrical connector (4) from the N/WS feedback sensor-box (3GC) (1).
(3) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST between the electrical connector (4) and the N/WS feedback sensor-box (3GC) (1).
(4) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
(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 (3).
(6) Make sure that the adjustments are correct.
(a) Measure the secondary voltages U1 and U2 for the N/WS feedback sensor-box (3GC) (1).
Make sure that:
| ------------------------------------- |
| ! U1 = U2 plus or minus 20mV ! |
| ------------------------------------- |
(b) If U1 is not equal to U2 plus or minus 20mV, do these steps:
1 Use a SPATULA - NON METALLIC to remove the sealant from:
- The area identified S
- The housing of the worm screw (5).
NOTE: Make sure not to cause damage to the surface protection of these parts.
(7) Loosen the screws (2) to release the N/WS feedback sensor-box (3GC) (1). (a) Do not remove the screws (2).
(8) Turn the worm screw (5) to get:
| ------------------------------------- |
| ! U1 = U2 plus or minus 20mV ! |
| ------------------------------------- |
(9) TORQUE the screws (2) to between 0.25 and 0.21 m.daN (22.12 and 18.58 lbf.in )
. (10) Make sure that:
| ------------------------------------- |
| ! U1 = U2 plus or minus 20mV ! |
| ------------------------------------- |
If not, do the adjustment again.
(11) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position.
(12) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3).
(13) Connect the electrical connector (4) to the N/WS feedback sensor-box (3GC) (1).
(14) Apply a layer of Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) on the areas identified S.
(15) Fill the housing of the worm screw (5) with Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .
(16) Do the adjustment procedure again for the N/WS feedback sensor-box (4GC) (monitor channel).
(17) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
F. Set the N/WS Zero Position for the N/WS Feedback Sensor-Box (4GC) (monitor channel)
(2) Disconnect the electrical connector (4) from the N/WS feedback sensor-box (4GC) (1).
(3) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3) between the electrical connector (4) and the N/WS feedback sensor-box (4GC) (1).
(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 (3).
(5) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
(6) Use a SPATULA - NON METALLIC to remove the sealant from:
(7) Loosen the screws (2) to release the N/WS feedback sensor-box (4GC) (1).
(a) Do not remove the screws (2).
(8) Turn the worm screw (5) to get the algebraic difference between U1 and U2 secondary voltages: C
(10) TORQUE the screws (2) to between 0.25 and 0.21 m.daN (22.12 and 18.58 lbf.in ).
(11) Do a check of the voltage again after torque the screws.
(a) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U1.
(b) Record the AC voltage (U1).
(c) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U2.
(d) Record the AC voltage (U2).
(e) Do a check of the algebraic value E:
(f) If the value E is not in the limits, do the procedure from step (6) again.
(12) If the value E is correct, on the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position.
(13) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3).
(14) Connect the electrical connector (4) to the N/WS feedback sensor-box (4GC) (1).
(15) Apply a layer of Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) on the areas identified S.
(16) Fill the housing of the worm screw (5) with Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .
Subtask 32-51-00-865-120-A NOTE: It is necessary to adjust the N/WS feedback sensor-box (4GC) (monitor channel) at the same value as the N/WS feedback sensor-box (3GC) (control channel) to prevent:
(1) On the landing-gear control and indicating panel (402VU), make sure that the A/SKID & N/W STRG switch is in the OFF position. - Differences between the command and monitoring acquisition thresholds
- Fault messages.
(2) Disconnect the electrical connector (4) from the N/WS feedback sensor-box (4GC) (1).
(3) Connect the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3) between the electrical connector (4) and the N/WS feedback sensor-box (4GC) (1).
(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 (3).
(5) On the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the ON position.
(6) Use a SPATULA - NON METALLIC to remove the sealant from:
- The area identified S
- The housing of the worm screw (5).
(7) Loosen the screws (2) to release the N/WS feedback sensor-box (4GC) (1).
(a) Do not remove the screws (2).
(8) Turn the worm screw (5) to get the algebraic difference between U1 and U2 secondary voltages: C
| ----------------------- |
| ! (U1 - U2) = C ! |
| ----------------------- |
NOTE: When you turn the worm screw (5), the N/WS feedback sensor-box (4GC) (1) moves and changes the secondary voltages U1 and U2.
When you turn the worm screw (5):
(9) Record the AC voltages U1 and U2. When you turn the worm screw (5):
- In one direction, U1 increases and U2 decreases,
- In the other direction, U2 increases and U1 decreases.
(10) TORQUE the screws (2) to between 0.25 and 0.21 m.daN (22.12 and 18.58 lbf.in )
. (11) Do a check of the voltage again after torque the screws.
(a) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U1.
(b) Record the AC voltage (U1).
(c) On the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3), set the selector switch to U2.
(d) Record the AC voltage (U2).
(e) Do a check of the algebraic value E:
| ------------------------------------ |
| ! (U1 - U2) = E = C +/- 20mV ! |
| ------------------------------------ |
(f) If the value E is not in the limits, do the procedure from step (6) again.
(12) If the value E is correct, on the landing-gear control and indicating panel (402VU), put the A/SKID & N/W STRG switch in the OFF position.
(13) Remove the F26792000 SENSOR-VOLTAGE TEST or F26792000-1 SENSOR-VOLTAGE TEST (3).
(14) Connect the electrical connector (4) to the N/WS feedback sensor-box (4GC) (1).
(15) Apply a layer of Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) on the areas identified S.
(16) Fill the housing of the worm screw (5) with Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .
G. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
5. Close-up| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | ENGINE/ENG2/OIL/PRESS | 2EN2 | N42 |
| 121VU | ENGINE/ENG1/OIL/PRESS | 2EN1 | N40 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY | 4GG | M36 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/CTL | 3GG | M35 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/CTL | 1GG | M34 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY | 2GG | M33 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | OIL/PRESS/ENG2 | 10KC2 | N42 |
| 121VU | OIL/PRESS/ENG1 | 10KC1 | N40 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ENGINE/ENG2/OIL/PRESS/AND REV SNSR/CHAN A | 2EN2 | N42 |
| 121VU | ENGINE/ENG1/OIL/PRESS/AND REV SNSR/CHAN A | 2EN1 | N40 |
Subtask 32-51-00-860-089-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that circuit breakers 2EN1 and 2EN2 are closed.
(3) Lower the aircraft on its wheels and remove the axle jack (Ref. AMM TASK 07-12-00-582-001).
(4) Set the rudder trim to the zero position.
(5) Close the radome (Ref. AMM TASK 53-15-11-410-001).
Subtask 32-51-00-860-089-B ** ON A/C NOT FOR ALL (1) Make sure that circuit breakers 2EN1 and 2EN2 are closed.
NOTE: The open status of circuit breakers 2EN1 and 2EN2 makes the engine thrust reversers unserviceable.
(2) Remove the warning notice(s) from circuit breakers 2EN1 and 2EN2. (3) Lower the aircraft on its wheels and remove the axle jack (Ref. AMM TASK 07-12-00-582-001).
(4) Set the rudder trim to the zero position.
(5) Close the radome (Ref. AMM TASK 53-15-11-410-001).
A. Aircraft Maintenance Configuration
(1) Make sure that circuit breakers 10KC1 and 10KC2 are closed.
(3) Lower the aircraft on its wheels and remove the axle jack (Ref. AMM TASK 07-12-00-582-001).
(4) Set the rudder trim to the zero position.
(5) Close the radome (Ref. AMM TASK 53-15-11-410-001).
Subtask 32-51-00-740-062-A Subtask 32-51-00-942-070-A (1) Make sure that circuit breakers 10KC1 and 10KC2 are closed.
NOTE: The open status of circuit breakers 10KC1 and 10KC2 makes the engine thrust reversers unserviceable.
(2) Remove the warning notice(s) from circuit breakers 10KC1 and 10KC2. (3) Lower the aircraft on its wheels and remove the axle jack (Ref. AMM TASK 07-12-00-582-001).
(4) Set the rudder trim to the zero position.
(5) Close the radome (Ref. AMM TASK 53-15-11-410-001).
C. Remove the Equipment
(1) Remove the nose-wheel alignment tool and the targets on the ground.
(2) Remove the 98F05003000002 TARGET-MEASUREMENT from point 12.
(3) Make sure that the work area is clean and clear of tools and other items.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).
(7) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(1) Remove the nose-wheel alignment tool and the targets on the ground.
(2) Remove the 98F05003000002 TARGET-MEASUREMENT from point 12.
(3) Make sure that the work area is clean and clear of tools and other items.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).
(7) Remove the ground support and maintenance equipment, the special and standard tools and all other items.