R (2) Apply power to the GAPCU:
R - energize the aircraft electrical circuits from the APU (Ref. AMM
R TASK 24-41-00-861-002)
R - energize the aircraft electrical circuits from the external power
R (Ref. AMM TASK 24-41-00-861-002).
R (3) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R (a) If the BITE test gives the message TEST FAILED:
R - push the line key adjacent to the TEST FAILED message.
R 1 If the maintenance message GAPCU (24XG) comes into view:_
R - do the trouble shooting procedure given in the Para 4.A.
R (b) If the BITE test gives the message TEST PASSED:
R - stop the trouble shooting.
R 4. Fault Isolation_______________
R A. If the BITE test gives the maintenance message GAPCU (24XG) or if the APU
R generator or the external power does not energize the aircraft electrical
R circuits:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM
R TASK 24-41-34-400-001).
R B. Make sure that the aircraft electrical circuits operate correctly in APU
R configuration and in external power configuration.
R (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK
R 24-41-00-861-002).
R (2) Let the APU generator operate for five minutes.
R (3) Energize the Aircraft Electrical Circuits from the external power
R (Ref. AMM TASK 24-41-00-861-002).
R (4) De-energize the aircraft electrical circuits from the APU (Ref. AMM
R TASK 24-41-00-862-002).
R (5) De-energize the aircraft electrical circuits from the external power
R (Ref. AMM TASK 24-41-00-862-002).
AC GROUND SERVICE BUS CONTROL - FAULT ISOLATION PROCEDURES
__________________________________________________________
TASK 24-42-00-810-801
Loss of the 212XP and 216XP Busbars in Ground Service Configuration
1. Possible Causes
_______________
- CNTOR-AC GND SVCE SPLY (12XX)
- CNTOR-AC SVCE BUS NORM SPLY (12XN)
- wiring
- C/B-SVCE/BUS2/212XP SPLY (2XX)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-42-00-861-001 Energize the Ground Service Network from the External Power AMM 24-42-00-862-001 De-energize the Ground Service Network Supplied from
the External Power AMM 24-42-55-000-001 Removal of the Contactors (12XX, 14XX) AMM 24-42-55-400-001 Installation of the Contactors (12XX, 14XX) AMM 24-51-55-000-001 Removal of the AC Service Bus Normal Supply Contactor
(12XN)
AMM 24-51-55-400-001 Installation of the AC Service Bus Normal Supply
Contactor (12XN)
ASM 24-42/01
3. Fault Confirmation
__________________
A. Job Set-up
(1) Energize the ground service network with the ground power unit (Ref. AMM TASK 24-42-00-861-001).
B. Test
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the forward attendant panel - the ceiling forward and aft lights (L 120RH, push the CABIN WDO and side) do not come on. CABIN CLG pushbutton switches. - the window forward and aft lights (R
side) do not come on.
「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 ∞∞24-42-00∞∞∞∞∞∞∞∞∞∞Page 201
Feb 01/98 CES
4. Fault Isolation
_______________
R **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
A. If the test confirms the fault:
- do a check of the status of the circuit breaker (2XX)
(1) If the circuit breaker is closed:
- do a check for 115VAC on the pins A/M, A/L and A/K of the contactor (12XX) (Ref. ASM 24-42/01).
(a) If there is no 115VAC:
- do a check of the wiring between the circuit breaker (2XX) and the contactor (12XX) (Ref. ASM 24-42/01).
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