_
 - do a check for a short to ground at the wiring between the PHC 2 pin A/B and the circuit breaker (1DA2).
 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/TAT (1DA2).
 (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.
 「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 246
 May 01/03R
 CES  Loss of the PHC 3

 1. Possible Causes
_______________
 - PHC-3 (6DA3)
 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)
 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 PHC 6DA3:
 - replace the PHC-3 (6DA3), (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 247
 May 01/03R
 CES  Failure of the Pitot Probe (PHC 3)

 1. Possible Causes
_______________
 - PROBE-PITOT, 3 (9DA3)

 - PHC-3 (6DA3)

 - wiring from the PHC 3 (6DA3) to the pitot probe 3 (9DA3)

 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 34-11-15-000-001 Removal of the Pitot Probe (9DA1, 9DA2, 9DA3) AMM 34-11-15-400-001 Installation of the Pitot Probe (9DA1, 9DA2, 9DA3) 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. If the test gives the maintenance message PITOT PROBE 9DA3:
 - disconnect the connector from the pitot probe 3 (9DA3) and do a check of the resistance between pin A/B and pin A/C.
 (1) If the resistance is more than 43 ohms (open circuit) or less than 35 ohms (short circuit):

 (a) Replace the PROBE-PITOT, 3 (9DA3), (Ref. AMM TASK 34-11-15-000-001) and (Ref. AMM TASK 34-11-15-400-001).

 (2) If the resistance is between 35 ohms and 43 ohms:

 (a) Replace the PHC-3 (6DA3), (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 248
 May 01/03R CES

 (b) If the fault continues:
 - do a check and repair the wiring from the PHC 3 (6DA3) to the pitot probe 3 (9DA3) pin A/H to pin A/B (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 249
 May 01/03R
 CES  Loss of the GND/FLT Information (PHC 3)

 1. Possible Causes_______________
 - PROX SNSR-NLG EXT, SYS 1 (24GA)

 - PROX SNSR-NLG EXT, SYS 2 (25GA)

 - LGCIU-1 (5GA1)

 - L/G/LGCIU/SYS1/NORM (1GA)

 - HYDRAULIC/LGCIU/SYS2 (2GA)