W DOC AIRBUS | TSM A320F

Brake Pedal Transmitter-Unit Inoperative

TASK 32-42-00-810-833-A
Brake Pedal Transmitter-Unit Inoperative

1. Possible Causes
  • transmitter unit (9GG)
  • BSCU [10GG]
  • wiring from the BSCU (10GG) to the transmitter unit (9GG)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 27-21-00-820-802
Adjustment of the Rods of the Normal Brake-Pedal Transmitter-Unit
AMM 31-32-00-860-009
Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
ASM 324201
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 32-42-47-000-001
Removal of the Transmitter Unit - Brake Pedal
AMM 32-42-47-400-001
Installation of the Transmitter Unit - Brake Pedal
AMM 32-46-00-740-002
BITE Test of the BSCU - Ground Scanning
AMM 32-46-00-740-005
BITE Test of BSCU - Normal Braking TEST
TSM TASK 32-42-00-03
NORMAL BRAKING - TASK SUPPORTING DATA
3. Fault Confirmation
Subtask 32-42-00-700-068-B
A. Tests
   (1) Do a visual inspection of the brake pedal assembly:
  • Make sure that the transmitter unit (9GG) is in good condition (no scratches, no damage or distortion).
  • Make sure that there is no distortion or damage to the rods of the pedal assembly.
  • Make sure that the rods are correctly safetied with lockwire.
   (2) Do the BITE test of the normal braking system AMM 32-46-00-740-005.
   (3) Do the ground scanning of the BSCU AMM 32-46-00-740-002.
4. Fault Isolation
Subtask 32-42-00-810-087-C ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message BRK PEDAL XMTR(9GG):
   (1) If the fault continues:
   (2) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 152:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3K, 1K, 7K to pins A/A, G, U ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3A, 1A, 7A to pins A/C, H, Y ASM 324201.
   (3) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 154:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/4K, 2K, 8K to pins A/B, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/4A, 2A, 8A to pins A/D, J, Z ASM 324201.
   (4) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 156 :
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5K, 1K, 7K to pins A/M, G, U ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5A, 1A, 7A to pins A/P, H, Y ASM 324201.
   (5) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 158:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/6K, 2K, 8K to pins A/N, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/6A, 2A, 8A to pins A/R, J, Z ASM 324201.
   (6) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 160:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3K, 1K, 7K to pins A/A, G, U and from pins AA/4K, 2K, 8K to pins A/B, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3A, 1A, 7A to pins A/C, H, Y and from pins AA/4A, 2A, 8A to pins A/D, J, Z ASM 324201.
   (7) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 161:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5K, 1K, 7K to pins A/M, G, U and from pins AA/6K, 2K, 8K to pins A/N, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5A, 1A, 7A to pins A/P, H, Y and from pins AA/6A, 2A, 8A to pins A/R, J, Z ASM 324201.
Subtask 32-42-00-810-087-D ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message BRK PEDAL XMTR(9GG):
   (1) If the fault continues:
   (2) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 152:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3K, 1K, 7K to pins A/A, G, U ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3A, 1A, 7A to pins A/C, H, Y ASM 324201.
   (3) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 154:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/4K, 2K, 8K to pins A/B, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/4A, 2A, 8A to pins A/D, J, Z ASM 324201.
   (4) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 156 :
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5K, 1K, 7K to pins A/M, G, U ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5A, 1A, 7A to pins A/P, H, Y ASM 324201.
   (5) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 158:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/6K, 2K, 8K to pins A/N, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/6A, 2A, 8A to pins A/R, J, Z ASM 324201.
   (6) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 160:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3K, 1K, 7K to pins A/A, G, U and from pins AA/4K, 2K, 8K to pins A/B, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3A, 1A, 7A to pins A/C, H, Y and from pins AA/4A, 2A, 8A to pins A/D, J, Z ASM 324201.
   (7) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 161:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5K, 1K, 7K to pins A/M, G, U and from pins AA/6K, 2K, 8K to pins A/N, K, V ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5A, 1A, 7A to pins A/P, H, Y and from pins AA/6A, 2A, 8A to pins A/R, J, Z ASM 324201.
Subtask 32-42-00-810-087-E ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message BRK PEDAL XMTR(9GG):
   (1) If the fault continues:
   (2) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 152:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3K, 1K, 7K to pins A/A, G, U ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3A, 1A, 7A to pins A/C, H, Y ASM 324201.
   (3) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 154:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/4K, 2K, 8K to pins B/D, C, J ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/4A, 2A, 8A to pins B/B, G, K ASM 324201.
   (4) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 156 :
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5K, 1K, 7K to pins A/M, G, U ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5A, 1A, 7A to pins A/P, H, Y ASM 324201.
   (5) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 158:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/6K, 2K, 8K to pins B/F, C, J ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/6A, 2A, 8A to pins B/H, G, K ASM 324201.
   (6) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 160:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3K, 1K, 7K to pins A/A, G, U and from pins AA/4K, 2K, 8K to pins B/D, C, J ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/3A, 1A, 7A to pins A/C, H, Y and from pins AA/4A, 2A, 8A to pins B/B, G, K ASM 324201.
   (7) If the fault continues and the TROUBLE SHOOTING DATA gives the fault code 161:
  • If the source of the message is BSCU SYS1, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5K, 1K, 7K to pins A/M, G, U and from pins AA/6K, 2K, 8K to pins B/F, C, J ASM 324201.
  • If the source of the message is BSCU SYS2, do a check and repair the wiring from the BSCU (10GG) to the transmitter unit (9GG) pins AA/5A, 1A, 7A to pins A/P, H, Y and from pins AA/6A, 2A, 8A to pins B/H, G, K ASM 324201.
Subtask 32-42-00-810-261-B
B. Do a check of the adjustment of the rods of the brake pedal transmitter unit (9GG) with the MCDU.
   (1) Fully release the brake pedals. If necessary, pull the pedals carefully with your hand to make sure that they are at the mechanical rest stop.
   (2) Do a refresh.
   (3) Get access to the SYSTEM REPORT/TEST/L/G page for BSCU1 and BSCU2 AMM 31-32-00-860-009.
ACTION
RESULT
  • Push the line key adjacent to the BSCU1 or BSCU2 indication.
  • The BSCU1 or BSCU2 page comes into view.
  • Push the line key adjacent to the SPECIFIC DATA indication.
  • The SPECIFIC DATA page comes into view.
  • Push the line key adjacent to the SYSTEM DATA indication.
  • The SYSTEM DATA page comes into view.
  • Record the RIGHT PEDAL UPOT/UREF and LEFT PEDAL UPOT/UREF parameters on the SYSTEM DATA page 1/3 32-42-00-03 TSM TASK 32-42-00-03.
NOTE: The RIGHT PEDAL UPOT/UREF value is shown on the left side of the BSCU TSD screen. The LEFT PEDAL UPOT/UREF value is shown on the right side of the BSCU TSD screen.
   (4) If the values are between 14.2 and 17.2:
     (a) Fully push the brake pedals.
     (b) Do a refresh and record again the RIGHT PEDAL UPOT/UREF and LEFT UPOT/UREF parameters on the SYSTEM DATA page 1/3 32-42-00-03 TSM TASK 32-42-00-03.
     (c) Make sure that the values are more than 94% for the left and right pedals.
   (5) If there are dashes in the RIGHT PEDAL UPOT/UREF and LEFT UPOT/UREF areas on the two BSCU systems and/or if the values are out of the limits:
     (a) Do the adjustment of the normal brake-transmitter rods AMM 27-21-00-820-802.
Subtask 32-42-00-700-069-A
C. Test
   (1) Do the test given in Para. 3.A.
   (2) If the fault continues, contact airbus.
[Rev.8 from Aug 2018] 2026.04.04 04:31:33 UTC
"AVIABRAIN" 2025