W DOC AIRBUS | TSM A320F

LGCIU Ground Power and 70Kts Inputs Inconsistent

TASK 32-31-00-810-893-A
LGCIU Ground Power and 70Kts Inputs Inconsistent

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 24-40-00-810-809-A
The EXT PWR/NOT IN USE Indicator Light Stays off when the EXT PWR Energizes the Aircraft
AMM 31-32-00-860-009
Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
AWM 323101
AWM 323102
AMM 32-31-71-000-001
Removal of the LGCIU
AMM 32-31-71-400-001
Installation of the LGCIU
AWM 324208
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)
AWM 326201
AWM 326202
AMM 32-69-00-740-001
BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative
3. Fault Confirmation
Subtask 32-31-00-710-082-A ** ON A/C NOT FOR ALL
A. Test
   (1) If there are ATA 24 or ATA 32-4X faults, do the applicable troubleshooting procedure first.
     (a) If the message WRG: AA7G/AA9H/LGCIU1(5GA1) is shown from LGCIU-1 do the fault Isolation in Para. 4. A. (1).
     (b) If the message WRG: AA7G/AA9H/LGCIU2(5GA2) is shown from LGCIU-2 do the fault isolation in Para. 4. A. (7).
     (c) If the two messages are shown do the fault isolation in Para. 4. A. (13).
NOTE: The Fault Confirmation that follows is only applicable to LGCIU part number 80-178-2-8812.
   (2) If a message or messages that follow is shown during ground maintenance with no ECAM WARNING SHOWN:
  • WRG: AA7G/AA9H/LGCIU1(5GA1) and WRG: AA7G/AA9H/LGCIU2(5GA2)
     (a) Get access to the SYSTEM REPORT/TEST L/G page AMM 31-32-00-860-009.
     (b) Select the applicable LGCIU.
     (c) Select trouble shooting data (TSD).
     (d) The LGCIU TSD shows 1X00 on word 4:
  • 1 shows the aircraft on ground
  • X is not applicable
  • 00 shows the BITE recording command from the CFDS was null.
  • This shows that the fault occurred on the ground and can be ignored.
     (e) Refer to table 1.
Table 1
!Word 1 ! Word 2! Word 3! Word 4!
! XXXX ! XXXX ! XXXX ! 1X00 !
! XXXX ! XXXX ! XXXX ! XXXX !
! XXXX ! XXXX ! XXXX ! XXXX !

NOTE: This fault can occur with one L/G lifted off the ground and the aircraft electrical power on.
4. Fault Isolation
Subtask 32-31-00-810-155-A ** ON A/C NOT FOR ALL
A. Procedure
   (1) Do a check and repair the aircraft wiring from the LGCIU-1 pin AA7G to ground through contactor 3XG, AWM 326201.
   (2) Do a check and repair the aircraft wiring from the LGCIU-1 pin AA9H to ground through RELAY 25GG AWM 323101.
   (3) Do a check and repair the aircraft wiring between the BSCU pin AA11F and C/B 2GG through RELAY WHEEL 1 SPEED (25GG), AWM 324208.
   (4) Do the BITE test of the LGCIU-1 AMM 32-69-00-740-001.
   (5) If the fault continues:
     (a) Replace the LGCIU-1 [5GA1] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001
   (6) If the fault continues do Para. 4. A. (13).
   (7) Do a check and repair the aircraft wiring from the LGCIU-2 pin AA7G to ground through contactor 3XG, AWM 326202.
   (8) Do a check and repair the aircraft wiring from the LGCIU-2 pin AA9H to ground through RELAY 24GG AWM 323102.
   (9) Do a check and repair the aircraft wiring between the BSCU pin AA12F and C/B 4GG through RELAY WHEEL 3 SPEED (24GG), AWM 324208.
   (10) Do the BITE test of the LGCIU-2 AMM 32-69-00-740-001.
   (11) If the fault continues:
     (a) Replace the LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
   (12) If the fault continues do Para. 4. A. (13).
   (13) Make sure that the EPC [3XG] operates correctly, (Ref. TSM TASK 24-40-00-810-809).
   (14) Replace the BSCU [10GG] , AMM 32-42-34-000-001 and AMM 32-42-34-400-001.
     (a) Do the BITE test of LGCIU-1 and LGCIU-2, AMM 32-69-00-740-001.
Subtask 32-31-00-810-155-B ** ON A/C NOT FOR ALL
A. Procedure
   (1) Do a check and repair the aircraft wiring from the LGCIU-1 pin AA7G to ground through contactor 3XG, AWM 326201.
   (2) Do a check and repair the aircraft wiring from the LGCIU-1 pin AA9H to ground through RELAY 25GG AWM 323101.
   (3) Do a check and repair the aircraft wiring between the BSCU pin AA11F and C/B 2GG through RELAY WHEEL 1 SPEED (25GG), AWM 324208.
   (4) Do the BITE test of the LGCIU-1 AMM 32-69-00-740-001.
   (5) If the fault continues:
     (a) Replace the LGCIU-1 [5GA1] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001
   (6) If the fault continues do Para. 4. A. (13).
   (7) Do a check and repair the aircraft wiring from the LGCIU-2 pin AA7G to ground through contactor 3XG, AWM 326202.
   (8) Do a check and repair the aircraft wiring from the LGCIU-2 pin AA9H to ground through RELAY 24GG AWM 323102.
   (9) Do a check and repair the aircraft wiring between the BSCU pin AA12F and C/B 4GG through RELAY WHEEL 3 SPEED (24GG), AWM 324208.
   (10) Do the BITE test of the LGCIU-2 AMM 32-69-00-740-001.
   (11) If the fault continues:
     (a) Replace the LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
   (12) If the fault continues do Para. 4. A. (13).
   (13) Make sure that the EPC [3XG] operates correctly, (Ref. TSM TASK 24-40-00-810-809).
   (14) Replace the BSCU [10GG] , AMM 32-42-34-000-001 and AMM 32-42-34-400-001.
     (a) Do the BITE test of LGCIU-1 and LGCIU-2, AMM 32-69-00-740-001.
[Rev.8 from Aug 2018] 2026.04.04 04:31:27 UTC
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