DOC AIRBUS | TSM A320FLGCIU BITE Test Not Possible
TASK 32-31-00-810-839-A
LGCIU BITE Test Not Possible
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 32-31-00-740-079-A
Subtask 32-31-00-810-090-B
[Rev.8 from Aug 2018]
2026.04.04 04:40:13 UTC
LGCIU BITE Test Not Possible
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. MOVEMENT OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
1. Possible Causes2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 32-31-00-810-813-A | R MLG Compressed/Extended Proximity Sensor Failed to Flight Condition |
| TSM TASK 32-31-00-810-814-A | L MLG Compressed/Extended Proximity Sensor Failed to Flight Condition |
| TSM TASK 32-31-00-810-815-A | NLG Compressed/Extended Proximity Sensor Fault |
| AMM 24-41-00-861-002 | Energize the Aircraft Electrical Circuits from the External Power |
| ASM 323103 | |
| ASM 323104 | |
| AMM 32-31-71-000-001 | Removal of the LGCIU |
| AMM 32-31-71-400-001 | Installation of the LGCIU |
| ASM 324201 | |
| AMM 32-42-34-400-001 | Installation of the Braking/Steering Control Unit (BSCU) |
| 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 |
Subtask 32-31-00-740-079-A
A. Test
(1) Make sure that the aircraft electrical circuits are energized with an external power supply AMM 24-41-00-861-002. If external power is not available, go to Para. 4. A. (5).
(2) Do a bite test on LGCIU 1 and LGCIU 2 AMM 32-69-00-740-001.
4. Fault Isolation(1) Make sure that the aircraft electrical circuits are energized with an external power supply AMM 24-41-00-861-002. If external power is not available, go to Para. 4. A. (5).
(2) Do a bite test on LGCIU 1 and LGCIU 2 AMM 32-69-00-740-001.
Subtask 32-31-00-810-090-B
A. Procedure
(1) If the LGCIU 1 and LGCIU 2 display CFDS fault messages, replace the BSCU [10GG] AMM 32-42-34-400-001 and AMM 32-42-34-400-001:
(a) Do the test (Ref. Para 3. A.).
(2) If only one LGCIU displays CFDS fault messages, interchange the LGCIU positions AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(3) If the fault moves with the LGCIU, interchange back the LGCIUs and replace the defective LGCIU-1 [5GA1] or LGCIU-2 [5GA2] (Ref. Para 4. A. (2)).
(4) If the fault stays in the same system, do a check for a ground signal at the LGCIU 1(2) connector AA pin 9H ASM 323103 or ASM 323104.
(5) If there is a ground, do the TSM procedures that follow:
(6) If there is no ground, do a check for ground at the RELAY-WHEEL 1 SPEED [25GG] connector AA pin Z ASM 324201.
(7) If there is a ground, replace the BSCU (Ref. para 4. A.).
(8) If there is no ground, replace the relay 24GG(25GG).
(9) Do a bite test of the LGCIU 1(2) (Ref. Para. 3. A.).
(1) If the LGCIU 1 and LGCIU 2 display CFDS fault messages, replace the BSCU [10GG] AMM 32-42-34-400-001 and AMM 32-42-34-400-001:
(a) Do the test (Ref. Para 3. A.).
(2) If only one LGCIU displays CFDS fault messages, interchange the LGCIU positions AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(3) If the fault moves with the LGCIU, interchange back the LGCIUs and replace the defective LGCIU-1 [5GA1] or LGCIU-2 [5GA2] (Ref. Para 4. A. (2)).
(4) If the fault stays in the same system, do a check for a ground signal at the LGCIU 1(2) connector AA pin 9H ASM 323103 or ASM 323104.
(5) If there is a ground, do the TSM procedures that follow:
- R MLG Compressed/Extended Proximity Sensor Failed to Flight Condition (Ref. TSM TASK 32-31-00-810-813)
- L MLG Compressed/Extended Proximity Sensor Failed to Flight Condition (Ref. TSM TASK 32-31-00-810-814)
- NLG Compressed/Extended Proximity Sensor Fault (Ref. TSM TASK 32-31-00-810-815).
(6) If there is no ground, do a check for ground at the RELAY-WHEEL 1 SPEED [25GG] connector AA pin Z ASM 324201.
(7) If there is a ground, replace the BSCU (Ref. para 4. A.).
(8) If there is no ground, replace the relay 24GG(25GG).
(9) Do a bite test of the LGCIU 1(2) (Ref. Para. 3. A.).