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When the emergency buses are selected, the batterycharging bus is isolated
from the batteries and the equipmentconnected to the emergency
buses will be powered from the aircraft's batteries.
4-2
PM-121
Change 4
Learjet 31A
Piloes Manual
BATTERY SWITCHES
The aircraft batteries are controlled through the BATTERY 1 and 2
switches on the pilot's switch panel. The LH (#1) battery is wired directly
to the battery bus in the pilot's circuit breaker panel and the RH
(#2) battery is wired directly to the battery bus in the copilot's circuit
breaker panel. When either BATTERY switch is placed in theOn position,
the corresponding battery relay closes to connect the respective
battery bus to the battery charging bus if the EMER BUS switch is in
the NORMAL position. When the BATTERY switch is placed in the
OFF position, the battery relay is deenergized and the respective battery
bus is isolated from the battery charging bus. The battery relays
will also be deenergized whenever the EMER BUS switch is in the
EMER position.
START-GEN SWITCHES
The starter/generators are controlled through the START-L GENand
START-R GEN switches on the pilot's switch panel. Each switch has
three positions: START, OFF, and GEN. Prior to starting an engine,
the following switches should be placed in the On position: BATTERY
1, BATTERY 2, applicable FUEL CMPTR, and applicable INVERTER.
The BATTERY switches will supply power to the L and R
IGN & START circuit breakers for starter and ignition system operation.
The digital electronic engine control (fuel computer) will supply
fuel scheduling for the start. The inverter is required to supply AC
power for the OlLPRESS indicating system.
STARTposition: With the thrust lever at CUTOFF and theBATTERY
switches On, DC power from theL and RIGN& STARTcircuit breakers
is applied to the left and right START-GEN switches. When a
START-GEN switch is set to START, DC power from the corresponding
IGN & STARTcircuit breaker is applied to close the corresponding
starter relay, activate the corresponding standby pump, and shutdown
the cooling and auxiliary heating (if installed) systems. When
the starter relay closes, the starter will begin to spool the engine and
the STARTlight will illuminate. When the corresponding thrust lever
is moved from CUTOFF to IDLE, switches in the throttle quadrant
will dose and activate the ignition system When Turbine Speed (N2)
reaches approximately 45%, a speed sensor in the starter/generator
will cause power to be removed from the starter relay (starter will be
deenergized and the STARTlight will extinguish) and discontinue ignition
(IGNITION light will extinguish).
Pilot's Manual
Learjet 31A
GEN position: During the engine start sequence, when engine RPM
reaches idle speed, the START-GEN switch should be set to GEN.
When GEN is selected, the corresponding standby pump will shut
down, and the corresponding generation circuits will be activated.
The generator will not come on line with aGPU connected. Additionally,
the cooling and auxiliary heating (if installed) systems, and stabilizer
heat system cutout relays will be reset. The generation circuits
activate and control the corresponding generator through the generator
control unit.
START LIGHTS
Amber lights adjacent to each START-GEN switch are installed to indicate
starter operation. The corresponding light will be illuminated
whenever the associated starter is energized.
GEN RESET BUTTONS
The GEN RESET buttons are located on the pilot's switch panel adjacent
to the START-GEN switches. Should a generator exceed 31 volts
output, the corresponding generator control unit will deenergize the
affected generator field circuit and open the generator relay isolating
the generator from the respective generator bus. Momentarily depressing
the applicable GEN RESET button will reset the generatorby
closing the affected generator field circuit and closing the generator
relay. The GEN RESET buttons have no effect with the corresponding
START-GEN switch OFF or the corresponding IGN START and/or
GEN circuit breakeropen.
GEN LIGHTS
Amber L GIN and R GEN annunciator lights are installed in the
glareshield annunciator panel. The lights are controlled by the corresponding
generator control circuits and will illuminate whenever the
corresponding generator has failed or is off the line due to an under
voltage or overvoltage condition. The light will also illuminate whenever
the corresponding START-GEN switch is in either START or
OFF and at least oneBATTERYswitch is On.
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