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overhead panel come on.
The Ground Power parameters are monitored by the Ground
Power Control Unit (GPCU) which activates the indicator
lights. With such indications the Ground Cart can
supply the aircraft network.
As soon as the External Power pushbutton is pressed
in, the Ground Power Control Unit closes the External
Power Contactor to supply the aircraft electrical
network.
The Bus Tie Contactors (BTC 1 and BTC 2) close only
if no engine generators are on line.
ABNORMAL PARAMETERS
If any external power parameter is not correct, the
indicator lights stay off.
The external power cannot be connected to the aircraft
network.
The detection of a GPCU fault causes the EPC to open.
TMUELAY01-T01 LEVEL 2
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EXTERNAL POWER - GENERAL DESCRIPTION
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SELF EXAMINATION
With the engine generators on line, what does the
EXT PWR ON light indicate when lit?
A - The external ground cart is supplying
the AC BUS 1 and 2.
B - The External Power Contactor is
controlled to close.
C - The external ground cart is supplying
the AC/DC ground service buses.
What does the EXT PWR AVAIL light indicate when lit?
A - The Ground Power Control Unit has
tripped the external ground cart.
B - The external ground cart is connected to
the aircraft network.
C - The external ground cart can be
connected to the aircraft network.
TMUELAY01 LEVEL 2
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24 - ELECTRICAL POWER
24-41-00 EXTERNAL POWER - SYSTEM D/O
CONTENTS:
Ground Cart
Operation Control
Protection
Self Examination
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EXTERNAL POWER - SYSTEM D/O
GROUND CART
The Ground Cart is plugged into the aircraft by means
of a standard 6 pin connector.
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EXTERNAL POWER - SYSTEM D/O - GROUND CART
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EXTERNAL POWER - SYSTEM D/O
OPERATION CONTROL (1)
With the Ground Cart running and switched on, the
Ground Power Control Unit allows the activation of the
indicator lights through the Pin Monitoring Relay and
the Power Ready relay.
TMUELAZ02-T02 LEVEL 2
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EXTERNAL POWER - SYSTEM D/O - OPERATION CONTROL (1)
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EXTERNAL POWER - SYSTEM D/O
OPERATION CONTROL (2)
The External Power Contactor is energized through a
Bus Tie Contactor/Generator Line Contactor logic, by
pressing the External Power pushbutton.
In the cockpit, the EXT PWR AVAIL light goes off as
well as the NOT IN USE light on the external power
receptacle.
TMUELAZ02-T03 LEVEL 2
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EXTERNAL POWER - SYSTEM D/O - OPERATION CONTROL (2)
TMUELAZ02-P03 LEVEL 2
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