Loss of the Validation Input (PHC 3)

TASK 30-31-00-810-834-A
Loss of the Validation Input (PHC 3)

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 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 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU

3. Fault Confirmation
Subtask 30-31-00-710-116-A

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

4. Fault Isolation
Subtask 30-31-00-810-083-A

A. If the test gives the maintenance message PHC3 : LGCIU2:

(1) If there is ground:

(2) If there is no ground:

(a) If the fault continues:

do a check and repair the wiring from the PHC 3 to the LGCIU 2 , pin A/<I to pin AA/12F ASM 303103.

Subtask 30-31-00-710-117-A

B. Do the operational test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:37 UTC