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the PULSE position, 28 VDCfrom the PULSE/RECOG LTcircuit breaker
is applied to the pulse controller unit which in turn lights the recognition
light by delivering pulsating DC current at approximately 45
cycles per minute . The effect of this pulsating current is to cause the
bulb's brightness to continually vary between approximately 40% and
100% of full bright. This feature results in enhanced aircraft recognition
and improved bulb life. Also, the landing lights will pulse alternately
with the recognition light if the landing gear is down and locked and
theLDG IT switches areOFF On aircraft with a pulsating recognition
light, a 7.5-amp PULSE/RECOG IT circuit breaker on the copilot's circuit
breaker panel supplies 28 VDC to the pulse controller unit.
WING INSPECTION LIGHT
For a description of the wing inspection light, refer to ANTI-ICE AND
ENVIRONMENTAL.
Learjet 31A
Pilot's Manual
COCKPIT LIGHTING
INSTRUMENT PANEL FLOODLIGHTS
A cold-cathode, fluorescent light is installed in the glareshield assembly
to provide flood illumination of the instrument panel. Electrical
power to operate the light is 600 VACsupplied through a power supply
unit. The light is controlled and dimmed through the FLOOD rheostat
switch on the pilot's dimmer panel. Electrical power to the power supply
unit is 115 VAC supplied through the 2-amp FLOOD LTS circuit
breaker on the pilot's circuit breaker panel. Instrument panel floodlights
are operative during EMER BUS mode.
INSTRUMENT LIGHTS
Incandescent lighting is installed for the pilot's indicators, copilot's indicators,
center instrument panel indicators, pedestal indicators, and
magnetic compass. The lights are powered by 5 VDC supplied by three
power supply units. Electrical power to the power supply units is 28
VDC supplied through the 7.5-amp INSTR LTS circuit breakers on the
pilot's and copilot's circuit breaker panels. The lights are controlled and
dimmed by the INSTR rheostat switch on the pilot's dimmer panel and
the PEDESTAL and INSTR rheostat switches on the copilot's dimmer
panels .
Pilot's INSTR dimmer switch : The pilot's INSTRdimmer switch provides
dimming for the engine instruments, R ENG indicator, EMERG
AIRpressure indicator, HYDPRESS indicator, FLAP indicator, WING
TEMP indicator, anti-skid panel, electric power monitor, autopilot controller,
pilot's angle-of-attack indicator, pilot's flight instruments, and
magnetic compass.
Copilot's INSTRdimmer switch: The copilot's INSTR dimmer switch
provides dimming for theTEMP CONT indicator, CABINTEMP indicator,
copilot's angle-of-attack indicator, copilot's flight instruments.
avionics in the center instrument panel, standby attitude gyro, standby
airspeed indicator, standby altimeter, and pressurization instruments.
Copilot's PEDESTAL dimmer switch: The PEDESTAL dimmer switch
on the copilot's dimmer panel provides dimming for the panels and
avionics installed in the pedestal.
SWITCH PANEL LIGHTING
Electroluminescent panel lighting is provided for the pilot's and copilot's
switch panels, audio control panels, the center switch panel, system
test switch panel, anti-skid panel, circuit breaker panels, pilot's and
copilot's dimmer panels, landing gear control panel, pressurization
PM-121
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Change 3
Pilot's Manual
Learjet 31A
module and oxygen control panel. The panels are supplied 115 VAC
through the 2-amp EL US circuit breakers on the pilot's and copilot's
circuit breaker panels. The lights are controlled and dimmed through
the EL PNL rheostat switches on the pilot's and copilot's dimmer panels.
Pilot's EL PNL dimmer switch: The pilot's EL PNL dimmer switch
controls the electroluminescent lighting of the pilot's switch panels, the
center switch panel, the anti-skid panel, the system test switch panel,
the pilot's audio control panel, the oxygen control panel, the pilot's
dimmer panel and the pilot's circuit breaker panel. On aircraft 31-119
and subsequent, a separate CB PNL dimmer switch controls the electroluminescent
lighting for the pilot's circuit breaker panel.
Copilot's EL PNL dimmer switch: The copilot's EL PNL dimmer
switch controls the electroluminescent lighting of the copilot's switch
panel, the copilot's audio control panel, the landing gear control panel,
the pressurization module, the copilot's dimmer panel and the copilot's
circuit breaker panel. On aircraft 31-119 and subsequent, a separate CB
PNL dimmer switch controls the electroluminescent lighting for the copilot's
circuit breaker panel.
MAP READING LIGHTS
Map reading lights are located on the left and right cockpit sidewalls
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