Failure of the L Static Probe (PHC1) A320
1.Possible Causes:
-PROBE-L STATIC, 1 (7DA1)
-PHC-1 (6DA1)
-ADIRU-1 (1FP1)
-wiring from the PHC 1 (6DA1) to the L static probe 1 (7DA1)
-wiring
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
| Ref. AMM 30-31-00-710-001 | Operational Test of the Probe Ice Protection |
| Ref. ASM 30-31-01 | |
| Ref. AMM 30-31-34-000-002 | Removal of the Probe Heat Computer (PHC) |
| Ref. AMM 30-31-34-400-002 | Installation of the Probe Heat Computer (PHC) |
| Ref. AMM 34-11-16-000-001 | Removal of the Static Probe |
| Ref. AMM 34-11-16-400-002 | Installation of the Static Probe |
| Ref. AMM 34-12-34-000-001 | Removal of the ADIRU |
| Ref. AMM 34-12-34-400-001 | Installation of the ADIRU |
| Ref. ASM 34-13-02 |
3. Fault Confirmation
SUBTASK 30-31-00-710-058-A
A. Test
(1) Do the operational test of the probe ice protection Ref. AMM 30-31-00-710-001.
4. Fault Isolation
SUBTASK 30-31-00-810-054-A
A. If the test gives the maintenance message L STATIC PROBE 7DA1:
— do a check of the resistance between pin 2 and pin 1.
(1) If the resistance is more than 13 ohms (open circuit) or less than 10 ohms (short circuit):
(a) Replace the PROBE-L STATIC, 1 (7DA1), Ref. AMM 34-11-16-000-001 and Ref. AMM 34-11-16-400-002.
(2) If the resistance is between 10 ohms and 13 ohms:
(a) Replace the PHC-1 (6DA1), Ref. AMM 30-31-34-000-002 and Ref. AMM 30-31-34-400-002.
(b) If the fault continues:
— do a check and repair the wiring from the PHC 1 (6DA1) to the L static probe 1 (7DA1), pin A/D to pin 2 Ref. ASM 30-31-01.
(3) If the fault continues:
(a) Disconnect connector A from PHC 1 and remove ADIRU 1 Ref. AMM 34-12-34-000-001.
(b) Do a check of the probe signal wiring Ref. ASM 34-13-02 between PHC 1 pin A/Y and ADIRU 1 pin AA/4H.
1 If there is no continuity:
— Repair the wiring and
— Install ADIRU 1 Ref. AMM 34-12-34-400-001.
2 If there is continuity:
— Replace ADIRU-1 (1FP1) Ref. AMM 34-12-34-400-001.
SUBTASK 30-31-00-710-059-A
B. Do the operational test given in Para. 3.
