Loss of the Power Supply for the Angle of Attack Sensor (PHC 3)

TASK 30-31-00-810-831-A
Loss of the Power Supply for the Angle of Attack Sensor (PHC 3)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
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)

3. Fault Confirmation
Subtask 30-31-00-710-110-A

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

4. Fault Isolation
Subtask 30-31-00-865-059-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	ANTI ICE/PROBES/3/AOA	4DA3	Z15

Subtask 30-31-00-810-080-A

B. If the test gives the maintenance message CHECK AOA PHC 3 SUPPLY:

(1) If the circuit breaker is closed:

(a) If there is 115VAC:

(b) If there is no 115VAC:

1 If there is no ground signal:

2 If there is a ground signal:

do a check of the wiring between the PHC 3 pin A/C and the circuit breaker (4DA3).

a If there is no continuity:

b If there is continuity:

(2) If the circuit breaker is open:

(a) If the fault continues:

(b) If the fault continues:

Subtask 30-31-00-710-111-A

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

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