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the respective GEN switch OFF.
·
APU GEN Switch
· ON The
Generator field is energized
and the line contactor closes provided
electrical parameters are normal and
the EXT PWR line contactor is open.
The bus tie contactor (1 and/or 2)
automatically closes if generators 1
and/or 2 are not operating.
· OFF The
Generator field is deenergized
and the line contactor
opens. The fault circuit is reset.
· Fault Light Illuminates
amber if a
protection trip is initiated by the
Generator control unit (GCU), or the
line contactor opens without selecting
the APU GEN switch OFF. The APU
GEN FAULT light is inhibited when
APU speed is low.
·
BUS TIE Switch
· AUTO The
Bus Tie contactors open
or close automatically to maintain
power supply to AC buses 1 and 2.
One contactor is closed when one
enginedriven
generator supplies the
associated AC bus and the APU
generator or external power supplies
the other side.
Both contactors are closed in case of
one enginedriven
generator, or
external power supply.
· OFF Both
Bus Tie contactors are
open.
·
EXT PWR Switch
When pushed with the EXT PWR AVAIL light
illuminated:
· External Power line contactor closes
· AVAIL light goes off
· ON light illuminates
When pushed with the EXT PWR ON light
illuminated:
· External Power line contactor opens
· ON light goes off
· AVAIL light illuminates
AVAIL Light Illuminates
green provided
External Power is plugged in and electrical
parameters are normal.
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Flight Deck Documentation AIRBUS A320
12.11.06 Ralf Anderseck Seite 222.2.9.
Air Conditioning & Pneumatic Controls ( A320 )
Air Conditioning
PACK Flow Selector
Permits selection of Pack Flow according to
number of passengers and ambient conditions.
Zone Temperature Selectors
Adjust Temperature for associated Zone.
HOT AIR Switch
· ON Automatically
controls zone Hot
Air pressure regulating valve.
· OFF Closes
Hot Air pressure
regulating valve and trim air valves
and resets fault circuit.
· Fault Light Illuminates
amber when
duct overheat is detected. If this
occurs, the zone Hot Air pressure
regulating valve and trim air valves
automatically close. The FAULT light
stay on until ;power temperature is
sensed with the switch off.
·
PACK 1/2 Switches
· ON Automatically
controls Pack Flow
control valve. Valve regulates flow,
except in the following conditions:
· Upstream pressure is below
minimum
· Compressor outlet overheat
· During Engine Start sequence
with ENG MODE selector set
to IGN/START or CRANK and:
· Either ENG MASTER
switch is ON
· The start valve is open
· N2 is less than 50%
· Corresponding fire switch is
depressed
· DITCHING switch is selected
ON
· OFF Closes
Pack Flow control valve.
· Fault Light Illuminates
amber when
Pack Flow control valve position
disagrees with selected position, or if
compressor outlet overheats
·
RAM AIR Switch (Guarded)
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Flight Deck Documentation AIRBUS A320
12.11.06 Ralf Anderseck Seite 23
· ON Illuminates
when selected on. If
the DITCHING switch is in its normal
guarded position:
· Ram Air inlet opens
· Normal outflow valve control is
maintained if differential
pressure is greater than or
equal to 1 psi
· Outflow valve opens if
differential pressure is less
than 1 psi.
· OFF Closes
Ram Air inlet.
Pneumatic
ENG BLEED 1/2 Switches
· ON Opens
Bleed valve provided:
· Upstream pressure is above 8
psi
· APU BLEED switch is OFF or
APU Bleed valve is closed
· There is no leak, overpressure
or overtemperature
detected
· ENG FIRE switch not released
out
· Engine start valve is closed
· OFF Closes
Bleed valve and HP
valve. OFF light illuminates white.
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A320 Flight Deck Documentation(7)
