1. Possible Causes
_______________
 - PHC-2 (6DA2)

 - wiring between the PHC 2 pin A/S and the ground terminal

 - wiring between the PHC 2 pin A/A and the circuit breaker (3DA2) R - wiring from the PHC 2 (6DA2) pin A/H to the pitot probe 2 (9DA2) pin A/B
 - C/B-ANTI ICE/PROBES/2/PITOT (3DA2)
 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)
R  AMM 34-11-15-000-001 Removal of the Pitot Probe (9DA1, 9DA2, 9DA3)
R  AMM 34-11-15-400-001 Installation of the Pitot Probe (9DA1, 9DA2, 9DA3)
R  ASM 30-31/01 ASM 30-31/02
 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/2/PITOT  3DA2 Y14
 「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 230
 May 01/03 CES

 B. If the test gives the maintenance message CHECK PITOT PHC 2 SUPPLY:
 - do a check of the status of the circuit breaker (3DA2).
 (1) If the circuit breaker is closed:
 - do a check for 115VAC at pin A/A of the PHC 2 (6DA2).
 (a) If there is no 115VAC:

 - replace the PHC-2 (6DA2) (Ref. AMM TASK 30-31-34-000-002) and (Ref. AMM TASK 30-31-34-400-002).

 (b) If there is 115VAC:

 - do a check for a ground signal at pin A/S of the PHC 2 (6DA2).
 1 If there is no ground signal:
_
 - repair the wiring between the PHC 2 pin A/S and the ground terminal (Ref. ASM 30-31/02).
 2 If there is a ground signal:
_
 - do a check of the wiring between the PHC 2 pin A/A and the circuit breaker (3DA2).
 a If there is no continuity:
_ - repair the above wiring.
 b If there is continuity:
_
 - replace the circuit breaker (3DA2).
 (2) If the circuit breaker is open:
 - close the circuit breaker.
 (a) If the circuit breaker trips again: R - disconnect the connector from the pitot probe 2 (9DA2) and do a R check of the resistance between pin A/B and pin A/C.
R 1_ If the resistance is more than 43 ohms (open circuit) or less
R than 35 ohms (short circuit):

R a_ Replace the PROBE-PITOT 2 (9DA2) (Ref. AMM TASK 34-11-15-R 000-001) and (Ref. AMM TASK 34-11-15-400-001).

R 2_ If the resistance is between 35 ohms and 43 ohms:

R a_ Replace the PHC-2 (6DA2) (Ref. AMM TASK 30-31-34-000-002)
R and (Ref. AMM TASK 30-31-34-400-002).

R b_ If the fault continues:
R - do a check and repair the wiring from the PHC 2 (6DA2)
R pin A/H to the pitot probe 2 (9DA2) pin A/B (Ref. ASM 30-R 31/01).

 「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 231
 May 01/03 CES

R R 3_  If the fault continues: - do a check for a short to ground at the wiring between the PHC 2 pin A/A and the circuit breaker (3DA2).
 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/2/PITOT (3DA2).
 (b) If the circuit breaker stays closed and the fault continues: - replace the PHC-2 (6DA2).
 C. Do the operational test given in Para. 3.

 Failure of the L Static Probe (PHC 2)
 1. Possible Causes
　
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