(2) De-energize the aircraft electrical circuits
 (Ref. AMM TASK 24-41-00-862-002).

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 TASK 24-22-00-810-809
 Failure of the TDC AC1 Sensor
 1. Possible Causes
_______________
 - GCU-1 (1XU1)

 - GPCU (1XG)

 - SENSOR-TDC AC, 1

 - wiring

 - ENG1 LO OIL PRESS RELAY (7XT)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-22-18-000-001 Removal of the TDC AC Sensor 1(2) (50XU1, 50XU2)
 AMM 24-22-18-400-001 Installation of the TDC AC Sensor 1(2) (50XU1, 50XU2)
 AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit

 (GPCU) AMM 24-41-34-000-001 Removal of the Ground Power Control Unit (GPCU) (1XG) AMM 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU)
 (1XG)
 ASM 24-22/02
 ASM 24-41/02

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the GPCU (Ref. AMM TASK 24-41-00-740-002).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 227
 201-299, 301-399, Aug 01/05 CES

 4. Fault Isolation
_______________

 A. If the test gives the maintenance message TDC AC SENSOR 50XU1:
 - replace the SENSOR-TDC AC, 1 (Ref. AMM TASK 24-22-18-000-001) and (Ref. AMM TASK 24-22-18-400-001).
 (1) If the fault continues:
 - do a check of the wiring: . from the pin AB/12A of the GPCU (1XG) to the pin A/A1 of the ENG1 LO OIL PRESS RELAY (7XT) . from the pin A/A2 of the ENG1 LO OIL PRESS RELAY (7XT)to the pin A/B1 of the TDC AC1 SENSOR (50XU1) . from the pin A/B3 of the TDC AC1 sensor to the pin AB/10A of the GPCU . from the pin A/B3 of the TDC AC1 sensor to the pin AA/3A of the GCU1 (1XU1) (Ref. ASM 24-22/02).
 (a) If there is no continuity:

 - repair the wiring.

 (b) If there is continuity:

 - replace the ENG1 LO OIL PRESS RELAY (7XT).

 (c) If the fault continues:

 - do a check of the wiring . from the pins AA/13C, AA/14C and AA/11D of the GPCU to the pins AB/14C, AB/14D and AB/15C of the GCU1 (Ref. ASM 24-41/02).
 1 If there is no continuity:
_ - repair the wiring.
 2 If there is continuity:
_
 - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK 24-22-34-400-001).
 a If the fault continues:
_
 - replace the GPCU (1XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 228
 201-299, 301-399, Aug 01/05 CES

 TASK 24-22-00-810-810

 Failure of the TDC AC2 Sensor
 1. Possible Causes
_______________
 - GCU-2 (1XU2)

 - GPCU (1XG)

 - SENSOR-TDC AC, 2

 - wiring

 - ENG2 LO OIL PRESS RELAY (8XT)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-22-18-000-001 Removal of the TDC AC Sensor 1(2) (50XU1, 50XU2)
 AMM 24-22-18-400-001 Installation of the TDC AC Sensor 1(2) (50XU1, 50XU2)
 AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit

 (GPCU) AMM 24-41-34-000-001 Removal of the Ground Power Control Unit (GPCU) (1XG) AMM 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU)
　
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