R . pin F of the external power receptacle and pin B/12E of the
R GAPCU.
R (a) If the AC or DC voltage is out of the limits:
R - repair or replace as necessary.
R (b) If the AC or DC voltage is not out of the limits:
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 this procedure to make sure that the system operates correctly.
R (1) Energize the aircraft electrical circuits from the external power
R (Ref. AMM TASK 24-41-00-861-002).
R (2) De-energize the aircraft electrical circuits from the external power
R (Ref. AMM TASK 24-41-00-862-002).
R TASK 24-41-00-810-812
R Failure of the External Power
R 1. Possible Causes_______________
R - GAPCU (24XG)
R - wiring
R - C/B-GND/PWR/PROT (2XG)
R - feeders
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-41-00-861-002
R
R AMM 24-41-00-862-002
R
R AMM 24-41-34-000-001
R
R AMM 24-41-34-400-001
R
R ASM 24-41/01
R 3. Fault Confirmation
__________________
Energize the Aircraft Electrical Circuits from the External Power De-energize the Aircraft Electrical Circuits Supplied from the External Power Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG)
R A. If the external power source is connected to the aircraft electrical
R circuits while a different source supplies the aircraft electrical
R circuits (IDG, APU, batteries):
R - on the ELEC panel 35VU, release, push and release again the ELEC/EXT
R PWR pushbutton switch (10XG) to do a reset of the GAPCU protection
R function. Then close the interlock on the Ground Power Unit (GPU).
R (1) If on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG)
R comes on and if on the ELEC panel 35VU, the AVAIL legend of the
R ELEC/EXT PWR pushbutton switch (10XG) comes on:
R - stop the trouble shooting.
R (2) If on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG)
R stays off and if on the ELEC panel 35VU, the AVAIL legend of the
R ELEC/EXT PWR pushbutton switch (10XG) stays off:
R - do the trouble shooting given in Para. 4.B.
R B. If the external power source is connected to the aircraft electrical
R circuits with no other source(s) connected (IDG, APU, batteries):
R - on the ELEC panel 35VU, push the BAT 1 and BAT 2 pushbutton switches
R (7PB1 and 7PB2) (on the MCDU menu page, make sure that the CFDS
R indication comes into view).
R - on the ELEC panel 35VU, release, push and release again the ELEC/EXT
R PWR pushbutton switch (10XG) to do a reset of the GAPCU protection
R function. Then close the interlock on the Ground Power Unit (GPU).
R (1) If on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG)
R comes on and if on the ELEC panel 35VU, the AVAIL legend of the
R ELEC/EXT PWR pushbutton switch (10XG) comes on:
R - stop the trouble shooting.
R (2) If on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG)
R stays off and if on the ELEC panel 35VU, the AVAIL legend of the
R ELEC/EXT PWR pushbutton switch (10XG) stays off:
R - do the trouble shooting given in Para. 4B.
R 4. Fault Isolation
_______________
R A. Table of the circuit breakers used in this procedure:
R -------------------------------------------------------------------------------R PANEL DESIGNATION IDENT. LOCATION
R -------------------------------------------------------------------------------R 123VU GND/PWR/PROT 2XG AB07
R B. If the test confirms the fault:
R - on the AC power center panel 123VU, do a check of the status of the
R GND/PWR/PROT circuit breaker (2XG).
R (1) If the circuit breaker (2XG) is open:
R - close it
R - close the interlock on the GPU.
R (a) If the circuit breaker (2XG) trips:
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