W DOC AIRBUS | AMM A320F

Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON

TASK 32-42-00-720-002-A
Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON

1. Reason for the Job
To make sure that:
  • The two tachometers on each Main Landing Gear (MLG) operate correctly after their removal/installation.
  • The anti-skid function operates correctly. If you replace only one tachometer for each landing gear, it is only necessary to do the functional test of the tachometers with AIDS (Ref. AMM TASK 32-42-00-720-00300).
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
355M03190000
2
MLG WHEEL TACHOMETER DRIVING TOOL
355M03190001
2
WHEEL TACHYMETER DRIVING TOOL, MLG
98D32403003000
2
DRIVING ADAPTOR
98D32403004000
2
DRIVING ADAPTER
G5-5M0-319-0000
2
MLG WHEEL TACHYMETER DRIVING TOOL
 B. Referenced Information
REFERENCE
DESIGNATION
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 27-96-00-740-001-A
BITE Test of the EFCS (Ground Scanning)
TASK 29-10-00-864-001-A
Depressurize the Green 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 34-10-00-860-004-A
Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-01
Automatic Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02
Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 34-10-00-860-005-A
ADIRS Stop Procedure
3. Job Set-up
Subtask 32-42-00-860-059-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the wheel chocks are in position.
   (2) If necessary, remove the hubcaps or the debris guards (if brake fans are installed).
   (3) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
   (4) Pressurize the Green hydraulic system (Ref. AMM TASK 29-23-00-863-001).
   (5) On the panel 402VU, make sure that the ANTI SKID selector switch is in the ON position.
   (6) Do the IR alignment procedure (Ref. AMM TASK 34-10-00-860-004).
   (7) Put the parking brake control switch in the OFF position.
Subtask 32-42-00-865-056-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUL/G/Y BRK/PRESS/IND61GGC10
** ON A/C NOT FOR ALL
49VUABCU &/Y BRK/PRESS IND61GGC10
** ON A/C ALL
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/SPLY4GGM36
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/CTL3GGM35
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/CTL1GGM34
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY2GGM33
121VUHYDRAULIC/SOL VALVES/G/Y/PTU1801GLN34
4. Procedure
CAUTION: DURING THE FUNCTIONAL TEST OF THE TACHOMETERS, MAKE SURE THAT THE OPERATION OF THE BRAKE PISTONS IS CORRECT AND AGREES WITH EACH STEP GIVEN IN THIS TEST: INCORRECT OPERATION OF THE BRAKE PISTONS CAN BE CAUSED BY A BAD OR A CROSSED CONNECTION OF THE TACHOMETERS DURING INSTALLATION, AND CAN CAUSE UNSATISFACTORY BRAKING AND/OR A TIRE BURST DURING AIRCRAFT OPERATION.
Subtask 32-42-00-480-050-A ** ON A/C NOT FOR ALL
A. Installation of the Driving Tool/Adaptor
NOTE: If the MLG WHEEL TACHOMETER DRIVING TOOL is not available, as an alternative, you can use a standard drilling machine and a DRIVING ADAPTOR (98D32403003000). These tools are interchangeable and you can use two different tools when you do this procedure.
   (1) Install the 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or the G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL on the wheel that has the tachometer for which it is necessary to do the test.
NOTE: If the 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or the G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL is not available :
  • Install a 98D32403003000 DRIVING ADAPTOR on a standard drilling machine.
  • Connect the 98D32403003000 DRIVING ADAPTOR to the drive shaft of the tachometer for which it is necessary to do the test.
   (2) Install a 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or 98D32403003000 DRIVING ADAPTOR or G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL on the drive shaft of the tachometer of another MLG wheel (see the table that follows).

Wheel with tachometer for which it is necessary to do the test
Wheel on which you must install the other DRIVING TOOL/ADAPTOR
1
3 or 4
2
3 or 4
3
1 or 2
4
1 or 2
Subtask 32-42-00-480-050-B ** ON A/C NOT FOR ALL
A. Installation of the Driving Tool/Adaptor
NOTE: If the MLG WHEEL TACHOMETER DRIVING TOOL is not available, as an alternative, you can use a standard drilling machine and a DRIVING ADAPTOR (98D32403003000) or DRIVING ADAPTER (98D32403004000). These tools are interchangeable and you can use two different tools when you do this procedure.
   (1) Install the 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or the G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL on the wheel that has the tachometer for which it is necessary to do the test.
NOTE: If the 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or the G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL is not available :
     (a) Install one 98D32403003000 DRIVING ADAPTOR for aircraft without brake fan or one 98D32403004000 DRIVING ADAPTER for aircraft fitted with brake fans on a standard drilling machine.
     (b) Connect the 98D32403003000 DRIVING ADAPTOR or the 98D32403004000 DRIVING ADAPTER to the drive shaft of the tachometer for which it is necessary to do the test.
   (2) Install a 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL or a 98D32403003000 DRIVING ADAPTOR or a 98D32403004000 DRIVING ADAPTER on the drive shaft of the tachometer of another MLG wheel (see the table that follows).

Wheel with tachometer for which it is necessary to do the test
Wheel on which you must install the other DRIVING TOOL/ADAPTOR
1
3 or 4
2
3 or 4
3
1 or 2
4
1 or 2
Subtask 32-42-00-720-050-A
B. Test
   (1) Test of the Tachometers on the left MLG (wheels 1 and 2)

ACTION
RESULT
1.On the Captain or First Officer side:
  • push the brake pedals.
On the left MLG, all the brakes are applied:
  • the brake pistons extend,
  • the wear pins move in relation to the pistons,
  • the piston housings move in the opposite direction.
2.On the two DRIVING TOOLS/ADAPTORS:
  • set a wheel speed of between 900 and 1100 rpm.
On the left MLG wheel without the DRIVING TOOL/ADAPTOR, the brake is released:
  • the brake pistons retract (gap between the head of the pistons and the pressure plate),
  • the wear pins move in relation to the pistons,
  • the piston housings move in the opposite direction.
3.On the DRIVING TOOL/ADAPTOR connected to the left MLG wheel:
  • decrease the speed to zero.
On this wheel, the brake is released:
  • the brake pistons retract,
  • the wear pins move in relation to the pistons,
  • the piston housings move in the opposite direction.
4.Release the brake pedals.
On the left MLG:
  • all the brakes are released.
5.On the DRIVING TOOL/ADAPTOR connected to the wheel of the opposite landing gear (right side):
  • decrease the speed to zero.
NOTE: the reference speed in the computer is zero 20 seconds after the end of the test.

6.Do the steps 1 to 6 with the DRIVING TOOL/ADAPTOR connected to the other tachometer on the left MLG.


Subtask 32-42-00-720-055-A
C. Test
   (1) Test of the Tachometers on the Right MLG (wheels 3 and 4)

ACTION
RESULT
1.On the Captain or First officer side:
  • push the brake pedals.
On the right MLG, all the brakes are applied:
  • the brake pistons extend,
  • the wear pins move in relation to the pistons,
  • the piston housings move in the opposite direction.
2.On the two DRIVING TOOLS/ADAPTORS:
  • set a wheel speed of between 900 and 1100 rpm.
On the right MLG wheel without the DRIVING TOOL/ADAPTOR, the brakes is released:
  • the brake pistons retract (gap between the head of the pistons and the pressure plate),
  • the wear pins move in relation to the pistons,
  • the piston housings move in the opposite direction.
3.On the DRIVING TOOL/ADAPTOR connected to the right MLG wheel:

  • decrease the speed to zero.
On this wheel, the brake is released:
  • the brake pistons retract,
  • the wear pins move in relation to the pistons,
  • the piston housings move in the opposite direction.
4.Release the brake pedals.
On the right MLG:
  • all the brakes are released.
5.On the DRIVING TOOL/ADAPTOR connected to the wheel of the opposite landing gear (left side):
  • decrease the speed to zero.
NOTE: the reference speed in the computer is zero 20 seconds after the end of the test.

6.Do the steps 1 to 6 with the DRIVING TOOL/ADAPTOR connected to the other tachometer on the right MLG.


Subtask 32-42-00-740-052-A
D. Reset of the Related SEC(s)
   (1) Do a reset of the related SEC(s).
     (a) For the tachometer(s) 19GG and/or 22GG (wheel 1) and/or 22GG (wheel 4):
  • on the overhead panel 24VU, release the FLT CTL SEC 3 pushbutton switch, then push it.
  • on the overhead panel 24VU, release the FLT CTL SEC 2 pushbutton switch, then push it.
     (b) For the tachometer(s) 20GG and/or 21GG (wheel 3) and/or 21GG (wheel 2):
  • on the overhead panel 23VU, release the FLT CTL SEC 1 pushbutton switch, then push it.
   (2) Do the BITE test of the EFCS computers (Ref. AMM TASK 27-96-00-740-001).
   (3) Make sure that the MCDU shows no maintenance message related to the tachometer.
Subtask 32-42-00-860-060-A ** ON A/C NOT FOR ALL
E. Aircraft Maintenance Configuration
   (1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
   (2) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
   (3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
   (4) Remove the 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or the 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or the G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL or the 98D32403003000 DRIVING ADAPTOR and the drilling machines.
   (5) install the hubcaps.
Subtask 32-42-00-860-060-B ** ON A/C NOT FOR ALL
E. Aircraft Maintenance Configuration
   (1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
   (2) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
   (3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
   (4) Remove the 355M03190000 MLG WHEEL TACHOMETER DRIVING TOOL or the 355M03190001 WHEEL TACHYMETER DRIVING TOOL, MLG or the G5-5M0-319-0000 MLG WHEEL TACHYMETER DRIVING TOOL or the 98D32403003000 DRIVING ADAPTOR or the 98D32403004000 DRIVING ADAPTER and the drilling machines.
   (5) Install the debris guards.
5. Close-up
Subtask 32-42-00-942-055-A
A. Removal of Equipment
   (1) Make sure that the work area is clean and clear of tools and other items.
[Rev.10 from 2021] 2026.04.01 00:47:33 UTC
"Aviabrain" 2025