W DOC AIRBUS | AMM A320F

Functional Test of the tachometers with the AIDS.

TASK 32-42-00-720-003-A
Functional Test of the tachometers with the AIDS.

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.
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.
1. Reason for the Job
To do a check for correct operation of a tachometer after replacement. This task is applicable when you replace only one tachometer on each landing gear. If you replace two tachometers on the same landing gear, refer to the functional test of the tachometers and the anti-skid system with the normal braking system on (Ref. AMM TASK 32-42-00-720-00200).
2. Job Set-up Information
 A. 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 31-36-00-740-008-A
Access to the Parameter Call-Up Menus
TASK 32-42-57-400-001-A
Installation of the Tachometer
3. Job Set-up
Subtask 32-42-00-860-091-C
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002)
   (2) On the panel 402 VU, make sure that the ANTI SKID selector switch is in the ON position.
   (3) Remove the hubcap or the debris guard (if brake fans are installed) of the related wheel tachometer removed.
Subtask 32-42-00-865-070-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** 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
Subtask 32-42-00-720-052-C
A. Test of the Tachometers.
   (1) Get access to the parameter call-up menus (Ref. AMM TASK 31-36-00-740-008).
ACTION
RESULT
1.With the MCDU keyboard, enter the wheel-speed parameter-label call-up with the alphanumeric keys in the format:
EQ/SYS/LAB/SDI

NOTE: For the parameter label, the equipment number (EQ) format can be entered with 2 digits (6E) or 3 digits (06E) depending on FDIMU or DMU configuration.
6E/1/320/01 for wheel 1 speed system 1
6E/2/320/10 for wheel 1 speed system 2

6E/1/321/01 for wheel 2 speed system 1
6E/2/321/10 for wheel 2 speed system 2

6E/1/322/01 for wheel 3 speed system 1
6E/2/322/10 for wheel 3 speed system 2

6E/1/323/01 for wheel 4 speed system 1
6E/2/323/10 for wheel 4 speed system 2
The speed value is 00000000 in the DATA BITS Column




NOTE: The tachometer speed value is shown on bits 28 thru 21 in the DATA BITS column.
  • Manually turn the tachometer
The related tachometer speed value in the DATA BITS column changes from 00000000 to a different value.
5. Close-up
Subtask 32-42-00-860-092-C
A. Aircraft Maintenance Configuration
   (1) De energize the aircraft electrical circuit (Ref. AMM TASK 24-41-00-862-002)
   (2) Install the hubcap or the debris guard (if brake fans are installed) of the removed wheel tachometer (Ref. AMM TASK 32-42-57-400-001).
[Rev.10 from 2021] 2026.04.01 00:47:36 UTC
"Aviabrain" 2025