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 circuit breaker - on the panel 121VU, open the HYDRAULIC/LGCIU/SYS2 (2GA) circuit breaker.
 NOTE : Make sure that you obey the flight configuration
____ precautions (Ref. AMM TASK 32-00-00-860-001).
 - do a check for ground signal at PIN A/E and/or PIN A/D and/or PIN A/I of the PHC1 (6DA1).
 a If there is a ground signal:
_
 - replace the LGCIU-1 (5GA1) (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
 b If there is no ground signal:
_
 - replace the PHC-1 (6DA1) (Ref. AMM TASK 30-31-34-000-002) and (Ref. AMM TASK 30-31-34-400-002).
 c If the fault continues:
_
 - replace the LGCIU-2 (5GA2).
 * If the fault continues:
 「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 205
 May 01/03 CES

 - do a check and repair the wiring from the PHC 1 (6DA1) pin A/E to the LGCIU 1 (5GA1) pin AB/14A and/or from the PHC 1 pin A/D to the LGCIU 2 (5GA2) pin AB/14A (Ref. ASM 30-31/01).
 B. Do the 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 206
 May 01/03R
 CES  Loss of the Power Supply for the Pitot Probe

 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/A and the circuit breaker (3DA1) R - wiring from the PHC 1 (6DA1) pin A/H to the pitot probe 1 (9DA1) pin A/B
 - C/B-ANTI ICE/PROBES/PITOT/1 (3DA1)
 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) 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 -------------------------------------------------------------------------------49VU ANTI ICE/PROBES/PITOT/1 3DA1 D02
 「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 207 B. If the test gives the maintenance message CHECK PITOT PHC 1 SUPPLY :

 - do a check of the status of the circuit breaker (3DA1).
 (1) If the circuit breaker is closed:
 - do a check for 115VAC at pin A/A of the PHC 1 (6DA1) (Ref. ASM 30-31/01).
 (a) If there is 115VAC:

 - replace the PHC-1 (6DA1) (Ref. AMM TASK 30-31-34-000-002) and (Ref. AMM TASK 30-31-34-400-002).

 (b) If there is no 115VAC:

 - do a check for a ground signal at pin A/S of the PHC 1 (6DA1).
 1 If there is no ground signal:
_
 - repair the wiring between the PHC 1 pin A/S and the ground terminal.
 2 If there is a ground signal:
_
 - do a check of the wiring between the PHC 1 pin A/A and the circuit breaker (3DA1).
 a If there is no continuity:
_ - repair the above wiring.
 b If there is continuity:
_
 - replace the circuit breaker (3DA1).
 (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 1 (9DA1) 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 1 (9DA1) (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:
　
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