_
 - do a check for a short to ground at the wiring between the PHC 1 pin A/C and the circuit breaker (4DA1).
 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/AOA/1 (4DA1).
 (b) If the circuit breaker stays closed and the fault continues:
 - replace the PHC-1 (6DA1).
 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 219
 May 01/03R
 CES  Failure of the TAT Sensor

 1. Possible Causes
_______________
 - SENSOR-TAT, 1 (11FP1)

 - PHC-1 (6DA1)

 - wiring from the PHC 1 (6DA1) to the TAT sensor 1 (11FP1)

 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 34-11-18-000-001 Removal of the TAT Sensor (11FP1, 11FP2)
 AMM 34-11-18-400-001 Installation of the TAT Sensor (11FP1, 11FP2)
 ASM 30-31/01

 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. If the test gives the maintenance message TAT SENSOR 11FP1:
 - disconnect the connector from the TAT sensor 1 (11FP1) and do a check of the resistance between pin A/B and pin A/C.
 (1) If the resistance is more than 24 ohms (open circuit) or less than 18 ohms (short circuit):

 (a) Replace the SENSOR-TAT, 1 (11FP1) (Ref. AMM TASK 34-11-18-000-001) and (Ref. AMM TASK 34-11-18-400-001).

 (2) If the resistance is between 18 ohms and 24 ohms:

 (a) Replace the PHC-1 (6DA1) (Ref. AMM TASK 30-31-34-000-002) and (Ref. AMM TASK 30-31-34-400-002).
 「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 220
 May 01/03R CES

 (b) If the fault continues:
 - do a check and repair the wiring from the PHC 1 (6DA1) to the TAT sensor 1 (11FP1), pin A/J to pin A/B (Ref. ASM 30-31/01).
 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 221
 May 01/03R
 CES  Loss of the Power Supply for the TAT Sensor

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

 - wiring between the PHC 1 pin A/S and the ground terminal

 - wiring between the PHC 1 pin A/B and the circuit breaker (1DA1)

 - C/B-ANTI ICE/PROBES/1/TAT (1DA1)

 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 30-31/01

 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/1/TAT 1DA1 Z12
 B. If the test gives the maintenance message CHECK TAT PHC1 SUPPLY:
 - do a check of the status of the circuit breaker (1DA1).
　
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