(b) If the fault continues:
 - do a check and repair the wiring from the PHC 3 (6DA3) to the angle of attack sensor 3 (3FP3), pin A/F to pin A/<J (Ref. ASM 30-31/03).
 B. Do the operational test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞30-31-00∞∞∞∞∞∞∞∞∞∞Page 263
 May 01/03R
 CES  Loss of the Power Supply for the Angle of Attack Sensor (PHC 3)

 1. Possible Causes
_______________
 - PHC-3 (6DA3)

 - wiring between the PHC 3 pin A/S and the ground terminal

 - wiring between the PHC 3 pin A/C and the circuit breaker (4DA3)

 - C/B-ANTI ICE/PROBES/3/AOA (4DA3)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 30-31-00-710-001 Operational Test of the Probe Ice Protection
 AMM 30-31-34-000-002 Removal of the Probe Heat Computer (PHC)
 (6DA1,6DA2,6DA3)
 AMM 30-31-34-400-002 Installation of the Probe Heat Computer (PHC)
 (6DA1,6DA2,6DA3)
 ASM 30-31/03

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the probe ice protection (Ref. AMM TASK 30-31-00-710-001).
 4. Fault Isolation
_______________
 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
122VU ANTI ICE/PROBES/3/AOA 4DA3 Z15
 B. If the test gives the maintenance message CHECK AOA PHC 3 SUPPLY:
 - do a check of the status of the circuit breaker (4DA3).
 (1) If the circuit breaker is closed:
 - do a check for 115VAC at pin A/C of the PHC 3 (6DA3).
 (a) If there is 115VAC:
 - replace the PHC-3 (6DA3) (Ref. AMM TASK 30-31-34-000-002) and (Ref. AMM TASK 30-31-34-400-002).
 May 01/03R CES

 (b) If there is no 115VAC:
 - do a check for a ground signal at pin A/S of the PHC 3 (6DA3). 1 If there is no ground signal:
_
 - repair the wiring between the PHC 3 pin A/S and the ground terminal (Ref. ASM 30-31/03).
 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:
_
 - repair the above wiring.
 b If there is continuity:

_
 - replace the circuit breaker (4DA3).
 (2) If the circuit breaker is open:
 - close the circuit breaker.
 (a) If the circuit breaker trips again:
 - replace the PHC-3 (6DA3).
 1 If the fault continues:

_
 - do a check for a short to ground at the wiring between the PHC 3 pin A/C and the circuit breaker (4DA3).
 a If there is a short to ground:
_
 - repair the related wiring. b If there is no short to ground:
_ - replace the C/B-ANTI ICE/PROBES/3/AOA (4DA3).
 (b) If the circuit breaker stays closed and the fault continues:
 - replace the PHC-3 (6DA3).
 C. Do the operational test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞30-31-00∞∞∞∞∞∞∞∞∞∞Page 265
 May 01/03R
 CES  Loss of the Validation Input (PHC 1)

 1. Possible Causes
_______________
 - PHC-1 (6DA1)

 - LGCIU-2 (5GA2)

 - wiring from the PHC 1 to the LGCIU 2

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 30-31-00-710-001 Operational Test of the Probe Ice Protection
 AMM 30-31-34-000-002 Removal of the Probe Heat Computer (PHC)
 (6DA1,6DA2,6DA3)
 AMM 30-31-34-400-002 Installation of the Probe Heat Computer (PHC)

 (6DA1,6DA2,6DA3)
 AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
　
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