R . pin A/5G of the GAPCU and pin A/28 of the annunciator light test and R interface board (10LP)
R . pin A/29 of the annunciator light test and interface board (10LP) and R pin 11 of the diode module 2422VD
R . pin 26 of the diode module 2422VD and pin 18 of the GLC APU (3XS)
R . pin 20 of the GLC APU and pin 26 of the EPC (3XG)
R . pin 28 of the EPC and pin A/A1 of the APU AVAIL relay (6KD)
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 226
Aug 01/05 CES
R . pin A/A2 of the APU AVAIL relay and pin 37 of the diode module
R 1162VD.
R (1) If there is a short to ground:
R - repair or replace the wiring as necessary.
R (2) If there is no short to ground:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).
R (3) If the fault continues:
R - replace the BOARD-ANN LT TEST & INTFC (10LP) (Ref. AMM TASK 33-14-
R 33-000-001) and (Ref. AMM TASK 33-14-33-400-001).
R B. When you replace a component or repair the wiring:
R - do the subsequent flight before you do the check of the Class 3 Faults
R of the GAPCU from the CFDS to make sure that the system operates
R correctly.
R If the test continues to give the fault message, continue the trouble
R shooting procedure.
R TASK 24-41-00-810-816 R Failure of the Auxiliary Control Circuit of the External Power R 1. Possible Causes
_______________
R - RELAY-EPC AUX CTL (5XG)
R - GAPCU (24XG)
R - wiring
R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-41-00-740-002 R AMM 24-41-34-000-001 R R AMM 24-41-34-400-001 R R ASM 24-23/02
R 3. Fault Confirmation
__________________
R A. Test Operational Check of GAPCU via CFDS Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG)
R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R 4. Fault Isolation
_______________
R A. If the BITE test gives the maintenance message GAPCU (24XG)/ EXT PWR AUX
R RELAY (5XG):
R - do a check of the coil and contacts of the EPC auxiliary control relay
R (5XG) (Ref. ASM 24-23/02) for correct electrical continuity between:
R . pins X1 and X2 (coil resistance)
R . pins D2 and D3 (normally closed)
R . pins D2 and D1 (normally open)
R . pins C2 and C3 (normally closed)
R . pins C2 and C1 (normally open).
R (1) If there is no continuity:
R - replace the RELAY-EPC AUX CTL (5XG).
R (2) If there is continuity:
R - do a check of the wiring of the EPC control circuit (Ref. ASM 24-R 23/02) for an open circuit or a short to ground between:
R . pin A/X2 of the EPC auxiliary control relay (5XG) and pin B/10A R of the GAPCU
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 228
Aug 01/05 CES
R . pin A/X1 of the EPC auxiliary control relay and pin 2 of the
R ELEC/EXT PWR/CTL circuit breaker (11XG).
R (a) If the wiring is not correct:
R - repair or replace as necessary.
R (b) If the wiring is correct
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and
R (Ref. AMM TASK 24-41-34-400-001).
R B. Do the test given in para. 3.
R TASK 24-41-00-810-817 R Failure of the Ground/Flight signal Between the GAPCU and the LGCIU R 1. Possible Causes
_______________
R - GAPCU (24XG) R - wiring R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
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