Loss of the Input Discrete (ENG 1/ENG 2) (PHC 1)
 1. Possible Causes
_______________
 - PHC-1 (6DA1)

 - RELAY-OIL LOW PRESS AND GROUND, ENG1 (12KS1)

 - RELAY-OIL LOW PRESS AND GROUND, ENG2 (12KS2)

 - wiring

 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. If the test gives the maintenance message CHECK EIU - PHC 1 INTERFACE:
 - do a check for ground at pin A/<F and/or pin A/<G of the PHC 1 (6DA1).
 (1) If there is ground:

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

 (2) If there is no ground:

 - replace the RELAY-OIL LOW PRESS AND GROUND, ENG1 (12KS1).
 (a) If the fault continues:
 - replace the RELAY-OIL LOW PRESS AND GROUND, ENG2 (12KS2).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞30-31-00∞∞∞∞∞∞∞∞∞∞Page 269
 May 01/03R CES

 (b) If the fault continues:
 1 Do a check and repair the wiring:
_
 - from the PHC 1 (6DA1) pin A/<F to the relay (12KS1) pin A/4

 - from the relay (12KS1) pin A/B to ground

 - from the PHC 1 (6DA1) pin A/<G to the relay (12KS2) pin A/4 and

 - from the relay (12KS2) pin A/B to ground (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 270
 May 01/03R
 CES  Loss of the Input Discrete (ENG 1/ENG 2) (PHC 2)

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

 - RELAY-OIL LOW PRESS AND GROUND, ENG1 (10KS1)

 - RELAY-OIL LOW PRESS AND GROUND, ENG2 (10KS2)

 - wiring

 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 30-31/02

 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. If the test gives the maintenance message CHECK EIU - PHC 2 INTERFACE:
 - do a check for ground at pin A/<F and/or pin A/<G of the PHC 2 (6DA2).
 (1) If there is ground:

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

 (2) If there is no ground:

 - replace the RELAY-OIL LOW PRESS AND GROUND, ENG1 (10KS1).
 (a) If the fault continues:
 - replace the RELAY-OIL LOW PRESS AND GROUND, ENG2 (10KS2).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞30-31-00∞∞∞∞∞∞∞∞∞∞Page 271
 May 01/03R CES

 (b) If the fault continues:
 1 Do a check and repair the wiring:
_
 - from the PHC 2 (6DA2) pin A/<F to the relay (10KS1) pin A/6
　
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