- replace the CT-AC, 1 (42XU1) and CT-AC, 1 (42XU3) (Ref. AMM TASK 24-22-17-000-001) and (Ref. AMM TASK 24-22-17-400-001).

 (b) If the values are in the specified tolerances:

 - do an impedance check of the IDG 1 current-transformer wiring between the pin A/1 and successively the pins A/6, A/7, A/8.
 NOTE : The normal impedance is 26 Ohms plus or minus 2 Ohms.
____
 1_ If the values are out of the specified tolerances:
 - replace the 4000XU (Ref. AMM TASK 24-21-51-000-040) and
 (Ref. AMM TASK 24-21-51-400-040).
 2_ If the fault continues:
 - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001)
 and (Ref. AMM TASK 24-22-34-400-001).

 B. When you replace a component or repair the wiring:
 - do the subsequent flight before you do the test given in Para. 3. to make sure that the system operates correctly. If the test continues to give the fault message, continue the trouble shooting procedure.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 202
 201-299, 301-399, Aug 01/05 CES

 TASK 24-22-00-810-803

 Difference in Current between the IDG 2 Current Transformer and the AC Current
 Transformer 2
 1. Possible Causes
_______________
 - CT-AC, 2 (42XU2)

 - CT-AC, 2 (42XU4)

 - GCU-2 (1XU2)

 - wiring

 - 4000XU

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-21-51-000-040 Removal of the Integrated Drive Generator -IDG 1(2),(4000XU) AMM 24-21-51-400-040 Installation of the Integrated Drive Generator -IDG 1(2),(4000XU) AMM 24-22-17-000-001 Removal of the AC Current Transformers (41XU1, 41XU2, 42XU1, 42XU2, 42XU3 and 42XU4) AMM 24-22-17-400-001 Installation of the AC Current Transformers (41XU1,
 41XU2, 42XU1, 42XU2, 42XU3 and 42XU4) 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)
 ASM 24-22/01

 3. Fault Confirmation
__________________
 A. Test Do the operational test of the GPCU and do the check of class 3 faults of the GPCU from the CFDS (Ref. AMM TASK 24-41-00-740-002).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CHECK GCU2 PIN B11D, B13D:
 - do a check of the wiring for short to ground or open circuit between respectively: . the pin B/11D of the GCU 2 and the pin A/4 of each AC 2 current transformer 42XU2 and 42XU4 . the pin B/13D of the GCU 2 and the pin A/1 of the IDG 2 (Ref. ASM 24-22/01).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 203
 201-299, 301-399, Aug 01/05 CES

 (1) If the wiring is not correct:

 - repair it.

 (2) If the wiring is correct:

 - do an impedance check of the internal wiring of the current transformers (42XU2 and 42XU4) between the pin A/4 and successively the pins A/1, A/2, A/3.
 NOTE : The normal impedance is 10.15 Ohms plus or minus 3.45 Ohms.
____
 - then do a check for insulation between the pin A/6 and successively the pins A/1, A/2, A/3, A/4.
 (a) If the values are out of the specified tolerances:

 - replace the CT-AC, 2 (42XU2) and CT-AC, 2 (42XU4) (Ref. AMM TASK 24-22-17-000-001) and (Ref. AMM TASK 24-22-17-400-001).

 (b) If the values are in the specified tolerances:

 - do an impedance check of the IDG 2 current-transformer wiring between the pin A/1 and successively the pins A/6, A/7, A/8.
 NOTE : The normal impedance is 26 Ohms plus or minus 2 Ohms.
____
 1_ If the values are out of the specified tolerances:
 - replace the 4000XU (Ref. AMM TASK 24-21-51-000-040) and
 (Ref. AMM TASK 24-21-51-400-040).
 2_ If the fault continues:
 - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001)
 and (Ref. AMM TASK 24-22-34-400-001).

 B. When you replace a component or repair the wiring:
 - do the subsequent flight before you do the test given in Para. 3. to make sure that the system operates correctly. If the test continues to give the fault message, continue the trouble shooting procedure.
　
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