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above the circuit breaker panels. Each lamp is mounted on a flexible
conduit and is controlled by a rheostat switch located on the base of the
assembly. The lights operate on 28 VDC supplied through the 7.5-amp
INSTR LTS circuit breakers on the pilot's and copilot's circuit breaker
panels.
DOME LIGHTS
Dome lights are installed in the cockpit overhead panel. These lights
may be used to illuminate the entire cockpit area. The lights are controlled
by two separate electrical circuits. A rocker switch next to each
light has three positions ON-Off-REMOTE. The first electrical circuit
does not require a BATTERY switch to be "on". Placing the respective
dome light switch to REMOTE will enable the light to be illuminated
by setting the cabin entrance STEP light switch On. The light will be
supplied 28 VDC through the 5-amp ENTRY LTS circuit breaker on the
pilot's circuit breaker panel. The second electrical circuit requires a
BATTERY switch to be On. Placing the respective dome light switch to
ON will illuminate the selected dome light. The light will be supplied
28 VDC through the 2-amp CABIN LTS circuit breaker on the copilot's
circuit breaker panel.
Learjet 31A
Pilot's Manual
An optional adjustable overhead dome light may be installed to allow
more light to be directed over the control wheels . Adjustments are
made by the BRT/DIM control knob located next to each ON-Off-REMOTE
switch.
PASSENGER COMPARTMENT LIGHTING
The passenger compartment lighting consists of cabin lights, table
lights, passenger reading lights, entry lights, cabin baggage compartment
lights, No Smoking/Fasten Seat Belt signs, and the refreshment
cabinet lights.
FLUORESCENT CABIN LIGHTS (IF INSTALLED)
Cabin lighting is provided by cold-cathode, fluorescent lighting recessed
in the cabin headliner. The lights are illuminated through a power
supply unit which operates on 28 VDC supplied through the 2-amp
or 5-amp CABIN ITS circuit breaker (depending on aircraft configuration)
on the copilot's circuit breaker panel. Some cabin lighting controls
consist of rocker switches while others consist of membrane-type
switches.
The rocker switches, labeled FORWARD CABIN LIGHTS, CENTER
CABIN LIGHTS, and AFT CABIN LIGHTS, are located in the left service
cabinet near the entry door. Each rocker switch has three positions:
BRT, off, and DIM. The membrane-type switches are located in the left
service cabinet near the entry door, and in some aircraft, within the
armrest storage compartment. Each membrane-type switch has three
positions: push bright/dim/off .
During engine start, the lights should be turned off or operated at full
bright . In the event of cabin depressurization, the lights will automatically
illuminate full bright if the cabin altitude reaches approximately
14,000 feet.
TABLE LIGHTS
The incandescent table lights installed on all aircraft consist of twolight
assemblies installed on the headliner and include an integral, directionally-
adjustable lens. Depending on interior configuration, some
table lights may be installed where no tables exist. Lighting control is
within the two-light assembly. Some aircraft use a push on/off switch
while others use a membrane-type switch. Each membrane-type switch
has three positions; push bright/dim/off .
PM-121
4-2:'
Change 3
Pilot's Manual
Learjet 31A
Aircraft with non-fluorescent cabin lights utilize the table lights for cabin
lighting. Cabin lighting controls are located in the left service cabinet
near the entry door, and in some aircraft, within the armrest storage
compartment. These controls operate the same as the individual membrane-
type switches except they will control the entire group of table
lights. If any one table light is on, pressing the cabin lighting control
switch will reset all table lights off.
The lights operate on 28 VDC supplied through the 5-amp TABLE ITS
circuit breaker located on the CABIN PWR BUS (overhead panel between
the crew members). In the event of cabin depressurization, the
lights will automatically illuminate full bright if the cabin altitude
reaches approximately 14,000 feet.
PASSENGER READING LIGHTS
Passenger reading lights are installed in the convenience panels above
the seats on each side of the cabin. Each convenience panel consists of
an eyeball-type air outlet, reading lights, and a switch. Each light includes
an integral, directionally-adjustable lens. The lights in some aircraft
are controlled through a push on/off switch while in others a
membrane-type switch is used. The membrane-type switch has three
positions : push bright/dim/off. Either switch is located in the convenience
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