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13) CTR TANK PUMP P/B
ON - Pumps are armed if the Mode Select Switch is in AUTO. The pumps will also
run if the Mode Select Switch is in MANUAL. The pumps provide 32 psi and
are not fitted with suction valve. Therefore, gravity feeding from the center
tank is not possible.
OFF - Pump is deactivated
FAULT - Low output pressure, when pump is operating
14) BATTERY P/B
AUTO - Batteries are connected to the DC BAT bus when:
· On the ground with no other power sources
· APU Starting
· Battery voltage below 26.5V, BCL closes allowing the battery to charge
· Below 100 knots during emergency electrical configuration.
OFF - Battery contactors are open
FAULT - The battery contactors are open due to an abnormal increase in the charging
current
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Note: In the Emergency Power Configuration, Battery #1 powers the static
inverter. Battery #1 also powers the AC Essential Bus when airspeed is
greater than 50 knots. Battery #2 powers the DC ESS Bus.
On the ground the BCL will open if EXT power or APU power is removed
and the battery voltage decreases to 23 volts for 16 seconds. This is to prevent
a total depletion of the batteries.
A minimum of 25 volts is required during preflight. If a condition of less
than 25 volts exists, the batteries must be charged prior to starting the APU.
The BATT switches must be in AUTO to charge. (Approximately 20 minutes
is required with EXT power).
15) GALLEY P/B
AUTO - Main and Secondary galley buses are powered. All galley buses are powered
on the ground with either the APU or EXT power on line.
The Main galley bus is shed when one generator is operating.
OFF - The Main and Secondary galley buses are not powered
FAULT - Load of any generator is over 100% rated output
16) GEN P/B (115/200V 3 phase 400hz 90 KVA)
ON - Field is energized. GLC armed to close.
OFF - · Generator field is de-energized
· Line contactor opens
· Fault circuit is reset
Exception: if a protection fault is caused by a differential fault, the reset
action has no effect after the second attempt.
FAULT - Opens GLC. GCU protection trip.
17) IDG P/B
FAULT - IDG oil temperature above 185°c or low oil pressure
The IDG will disconnect when the p/b is pressed for 3 seconds
18) AC ESS FEED
NORMAL - The AC ESS Bus is supplied from AC Bus #1
ALTN - The AC ESS Bus is being powered by AC Bus #2
FAULT - The AC ESS bus is not being powered
Note: With main generators lost, either the emergency generator or static
inverter supplies the AC ESS bus.
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19) BUS TIE P/B
AUTO - The BTC will open or close automatically to maintain power to AC buses
1&2
One contactor is closed when an engine generator supplies its respective AC
Bus with the APU or EXT power supplying the other bus.
Both contactors will close for a single AC power source.
OFF - Both bus tie contactors are open. APU or EXT power cannot energize the
aircraft’s buses.
20) EXT PWR P/B
AVAIL - External power is connected and is within limits.
The line contactor is open.
Pressed Momentarily – Opens or closes the line contactor.
ON - Line contactor closed. AVAIL light extinguishes.
Note: If EXT power is connected and the frequency and voltage destabilize,
or placed under a high demand, the flap position indicator will begin to flash.
EXT power has priority over the APU. The engine driven generator has
priority over EXT power.
21) APU GEN P/B
ON - The APU generator field is energized. The line contactor is armed to close.
OFF - · The generator field is de-energized
· The line contactor opens
· The fault circuit is reset
FAULT - Protection Trip. Opens line contactor.
Inhibited when APU speed is too low or during EXT power/engine generator
change over.
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Overhead Panel - Part 3
1) PACK FLOW SELECTOR
LO, NORM (auto), HI - LO = 80% of bleed air pressure
NORM = 100% = 44 psi (approx.)
HI = 120%
In the LO position, if the cooling demand is not being met, flow will
automatically increase to NORM (100%).
HI is automatically selected (regardless of switch position) when one pack is
off, or the APU is supplying bleed air.
2) TEMP CONTROLLER
Cold 64° f, Mid 76°f, Hot 86°f
Controls temperature via the Zone controller and trim valves.
The Zone controller has a Primary and Secondary channel.
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