Loss of the GND/FLT Information (PHC 1 and PHC 2)

TASK 30-31-00-810-869-A
Loss of the GND/FLT Information (PHC 1 and PHC 2)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 30-31-00-710-001	Operational Test of the Probe Ice Protection
ASM 303101
ASM 303102
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 32-31-73-200-001	Inspection of the MLG Proximity Sensor and Target Clearances
AMM 32-31-73-400-001	Installation of the MLG Proximity-Sensors

3. Fault Confirmation
Subtask 30-31-00-710-179-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the probe ice protection AMM 30-31-00-710-001.

4. Fault Isolation
Subtask 30-31-00-810-121-A ** ON A/C NOT FOR ALL

A. If the ECAM warning message ANTI ICE CAPT+F/O PITOT comes into view:

Do the inspection of the MLG proximity sensor and target clearances AMM 32-31-73-200-001.

(1) If the fault continues:

Replace the PROX SNSR-L L/G EXT, SYS 1 [21GA] , PROX SNSR-L L/G EXT, SYS 2 [23GA] , PROX SNSR-R L/G EXT, SYS 1 [20GA] and PROX SNSR-R L/G EXT, SYS 2 [22GA] AMM 32-31-73-000-001 and AMM 32-31-73-400-001.

(2) If the fault continues:

Do a check for ground signal at pin A/<E, pin A/<D and pin A/<I of the PHC 1 (6DA1) and PHC 2 (6DA2) ASM 303101 and ASM 303102.

(a) If there is no ground signal:

(b) If there is a ground signal:
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 2 (6DA2) ASM 303101 and ASM 303102.

1 If there is a ground signal:

2 If there is no ground signal:

a If the fault continues:

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 2 (6DA2) pin A/<E to the LGCIU 1 (5GA1) pin AB/14E and/or from the PHC 2 (6DA2) pin A/<D to the LGCIU 2 (5GA2) pin AB/14E ASM 303102.

Subtask 30-31-00-710-180-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:39 UTC