DOC AIRBUS | TSM A320FLoss of the GND/FLT Information (PHC 1 and PHC 3)
TASK 30-31-00-810-870-A
Loss of the GND/FLT Information (PHC 1 and PHC 3)
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 30-31-00-710-181-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 30-31-00-810-122-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:29:39 UTC
Loss of the GND/FLT Information (PHC 1 and PHC 3)
1. Possible Causes
- PROX SNSR-L L/G EXT, SYS 1 [21GA]
- PROX SNSR-L L/G EXT, SYS 2 [23GA]
- PROX SNSR-NLG EXT, SYS 1 [24GA]
- PROX SNSR-NLG EXT, SYS 2 [25GA]
- LGCIU-1 [5GA1]
- LGCIU-2 [5GA2]
- C/B-L/G/LGCIU/SYS1/NORM [1GA]
- C/B-HYDRAULIC/LGCIU/SYS2 [2GA]
- C/B-HYDRAULIC/LGCIU/SYS1/GRND SPLY [52GA]
- PHC-1 [6DA1]
- PHC-3 [6DA3]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 30-31-00-710-001 | Operational Test of the Probe Ice Protection |
| ASM 303101 | |
| ASM 303103 | |
| AMM 30-31-34-000-002 | Removal of the Probe Heat Computer (PHC) |
| AMM 30-31-34-400-002 | Installation of the Probe Heat Computer (PHC) |
| AMM 32-00-00-860-001 | Flight Configuration Precautions with Electrical Power |
| AMM 32-31-71-000-001 | Removal of the LGCIU |
| AMM 32-31-71-400-001 | Installation of the LGCIU |
| AMM 32-31-73-000-001 | Removal of the MLG Proximity-Sensors |
| AMM 32-31-73-000-005 | Removal of the NLG Proximity-Sensors |
| AMM 32-31-73-200-001 | Inspection of the MLG Proximity Sensor and Target Clearances |
| AMM 32-31-73-200-002 | Inspection of the NLG Proximity Sensor and Target Clearances |
| AMM 32-31-73-400-001 | Installation of the MLG Proximity-Sensors |
| AMM 32-31-73-400-005 | Installation of the NLG Proximity-Sensors |
Subtask 30-31-00-710-181-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 30-31-00-810-122-A ** ON A/C NOT FOR ALL
A. If the ECAM warning message ANTI ICE CAPT+STBY PITOT comes into view:
Simulate the flight configuration:
Subtask 30-31-00-710-182-A ** ON A/C NOT FOR ALL - Do the inspection of the MLG proximity sensor and target clearances AMM 32-31-73-200-001.
- Do the inspection of the NLG proximity sensor and target clearances AMM 32-31-73-200-002.
- Replace the PROX SNSR-L L/G EXT, SYS 1 [21GA] and PROX SNSR-L L/G EXT, SYS 2 [23GA] AMM 32-31-73-000-001 and AMM 32-31-73-400-001.
- Replace the PROX SNSR-NLG EXT, SYS 1 [24GA] and PROX SNSR-NLG EXT, SYS 2 [25GA] AMM 32-31-73-000-005 and AMM 32-31-73-400-005.
- Do a check for ground signal at pin A/<E, pin A/<D and pin A/<I of the PHC 1 (6DA1) and PHC 3 (6DA3) ASM 303101 and ASM 303103.
- Replace the LGCIU-1 [5GA1] and/or LGCIU-2 [5GA2] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
Simulate the flight configuration:
- Make sure that you obey the flight configuration precautions AMM 32-00-00-860-001.
- On the overhead circuit breaker panel 49VU, open the C/B-L/G/LGCIU/SYS1/NORM [1GA] circuit breaker.
- On the rear circuit breaker panel 121VU, open the C/B-HYDRAULIC/LGCIU/SYS2 [2GA] and C/B-HYDRAULIC/LGCIU/SYS1/GRND SPLY [52GA] circuit breakers.
- Do a check for ground signal at pin A/<E, pin A/<D and pin A/<I of the PHC 1 (6DA1) and PHC 3 (6DA3) ASM 303101 and ASM 303103.
- Replace the LGCIU-1 [5GA1] and/or LGCIU-2 [5GA2] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
- Replace the PHC-1 [6DA1] and PHC-3 [6DA3] AMM 30-31-34-000-002 and AMM 30-31-34-400-002.
- Do a check and repair the wiring :
. From the PHC 1 (6DA1), pin A/<E to the LGCIU 1 (5GA1) pin AB/14A and/or from the PHC 1 (6DA1) pin A/<D to the LGCIU 2 (5GA2) pin AB/14A ASM 303101.
. From the PHC 3 (6DA3), pin A/<E to the LGCIU 1 (5GA1) pin AB/15A and/or from the PHC 3 (6DA3) pin A/<D to the LGCIU 2 (5GA2) pin AB/15A ASM 303103.
B. Do the test given in Para. 3.