W DOC AIRBUS | TSM A320F

Pushbutton of the CAPT Nosewheel-Steering Handwheel Inoperative

TASK 32-51-00-810-805-A
Pushbutton of the CAPT Nosewheel-Steering Handwheel Inoperative

1. Possible Causes
  • XMTR UNIT-N/W STRG HANDWHEEL,CAPT [1GC]
  • BSCU [10GG]
  • wiring from the handwheel transmitter unit (1GC) pin A/K to the ground terminal
  • wiring from the BSCU (10GG) to the handwheel transmitter unit (1GC)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 32-42-34-000-001
Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001
Installation of the Braking/Steering Control Unit (BSCU)
AMM 32-46-00-740-001
BITE Test of the BSCU
ASM 325101
AMM 32-51-11-000-001
Removal of the Transmitter Unit - Nose-Wheel Steering Handwheel
AMM 32-51-11-400-001
Installation of the Transmitter Unit - Nose-Wheel Steering Handwheel
3. Fault Confirmation
Subtask 32-51-00-700-058-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do a reset of the BSCU with the A/SKID AND NOSE WHEEL switch (5GG).
   (2) Do the BITE test of the BSCU AMM 32-46-00-740-001.
     (a) If the test gives the maintenance message CAPT STEERING HANDWHEEL or BSCU, go to the Para. Fault Isolation.
     (b) If the test does not give the maintenance message CAPT STEERING HANDWHEEL or BSCU, but the fault continues:
       1 On the center pedestal, on the MCDU, push the line key adjacent to the STEERING DATA indication.
       2 Push the right or left rudder pedal fully and hold it in position.
       3 On the MCDU, push the line key adjacent to the REFRESH indication.
         a If, on the STEERING DATA page, the STEER ORDER is equal to 0 degrees:
  • Go to the Para. Fault Isolation 4.B.
         b If, with the handwheel pushbutton switch pushed, the STEER ORDER indication on the STEERING DATA page is equal to:
  • +6 degrees for the left rudder pedal, or
  • -6 degrees for the right rudder pedal:
         c Go to the Para. Fault Isolation 4.B.
Subtask 32-51-00-700-058-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do a reset of the BSCU with the A/SKID AND NOSE WHEEL switch (5GG).
   (2) Do the BITE test of the BSCU AMM 32-46-00-740-001.
     (a) If the test gives the maintenance message CAPT STEERING HANDWHEEL/BSCU (10GG), go to the Para. Fault Isolation.
     (b) If the test does not give the maintenance message CAPT STEERING HANDWHEEL/BSCU (10GG), but the fault continues:
       1 On the center pedestal, on the MCDU, push the line key adjacent to the SYSTEM DATA indication to get page 3/3.
         a Push the right or left rudder pedal fully and hold it in position.
         b If, on the SYSTEM DATA page 3/3, the rudder-pedal order value is equal to (-----):
NOTE: This value is shown below the REFRESH indication.
  • Go to the Para. Fault Isolation 4.B.
         c If, with the handwheel pushbutton switch pushed, the rudder-pedal angle value shown below the REFRESH indication on the SYSTEM DATA page 3/3 is equal to:
  • +31 degrees for the left rudder pedal, or
  • -31 degrees for the right rudder pedal:
         d Go to the Para. Fault Isolation 4.B.
Subtask 32-51-00-700-058-C ** ON A/C NOT FOR ALL
A. Test
   (1) Do a reset of the BSCU with the A/SKID AND NOSE WHEEL switch (5GG).
   (2) Do the BITE test of the BSCU AMM 32-46-00-740-001.
     (a) If the test gives the maintenance message CAPT STEERING HANDWHEEL/BSCU (10GG), go to the Para. Fault Isolation.
     (b) If the test does not give the maintenance message CAPT STEERING HANDWHEEL/BSCU (10GG), but the fault continues:
       1 On the center pedestal, on the MCDU, push the line key adjacent to the SYSTEM DATA indication to get page 3/3.
         a Push the right or left rudder pedal fully and hold it in position.
         b If, on the SYSTEM DATA page 3/3, the rudder-pedal order value is equal to (-----):
NOTE: This value is shown below the REFRESH indication.
  • Go to the Para. Fault Isolation 4.B.
         c If, with the handwheel pushbutton switch pushed, the rudder-pedal angle value shown below the REFRESH indication on the SYSTEM DATA page 3/3 is equal to:
  • +32 degrees for the left rudder pedal, or
  • -32 degrees for the right rudder pedal:
         d Go to the Para. Fault Isolation 4.B.
4. Fault Isolation
Subtask 32-51-00-810-054-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CAPT STEERING HANDWHEEL:
   (1) Replace the XMTR UNIT-N/W STRG HANDWHEEL,CAPT [1GC] AMM 32-51-11-000-001 and AMM 32-51-11-400-001.
   (2) If the fault continues:
   (3) If the fault continues:
  • Do a check for a ground signal at pin A/K of the handwheel transmitter unit (1GC) ASM 325101.
     (a) If there is no ground signal:
  • Repair the wiring from the handwheel transmitter unit (1GC) pin A/K to the ground terminal ASM 325101.
     (b) If there is a ground signal:
  • Do a check and repair the wiring from the BSCU (10GG) to the handwheel transmitter unit (1GC) pins AA/10G, 9G to A/J, H ASM 325101.
   (4) Do the test given in Para. Fault Confirmation.
Subtask 32-51-00-810-054-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CAPT STEERING HDWHL(1GC)/BSCU(10GG):
   (1) Replace the XMTR UNIT-N/W STRG HANDWHEEL,CAPT [1GC] AMM 32-51-11-000-001 and AMM 32-51-11-400-001.
   (2) If the fault continues:
   (3) If the fault continues:
  • Do a check for a ground signal at pin A/K of the handwheel transmitter unit (1GC) ASM 325101.
     (a) If there is no ground signal:
  • Repair the wiring from the handwheel transmitter unit (1GC) pin A/K to the ground terminal ASM 325101.
     (b) If there is a ground signal:
  • Do a check and repair the wiring from the BSCU (10GG) to the handwheel transmitter unit (1GC) pins AA/10G, 9G to A/J, H ASM 325101.
   (4) Do the test given in Para. Fault Confirmation.
Subtask 32-51-00-810-113-A
B. If the test does not give any maintenance messages related to the steering handwheel and the fault continues:
   (1) If the fault continues:
  • Do a check for continuity and short to ground, and repair the wiring ASM 325101 between:
. Pin AA/10G of the BSCU (10GG) and pin A/J of the transmitter unit (1GC) of the Captain nose-wheel steering-handwheel
. Pin AA/9G of the BSCU (10GG) and pin A/H of the transmitter unit (1GC) of the Captain nose-wheel steering-handwheel.
   (2) Do the test given in Para. Fault Confirmation.
[Rev.8 from Aug 2018] 2026.04.04 04:31:47 UTC
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