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Pilot’s Manual
4-30 PM-132A
OVRHD — The copilot’s overhead swivel light is controlled by the
OVRHD potentiometer. When the upper cabin door is closed, cockpit
overhead light control from the entryway switch panel assembly is
disabled. The overhead light is powered by the right main bus and is
protected by the OVRHD circuit breaker within the CABIN group on
the copilot’s circuit breaker panel. When the copilot’s overhead light is
controlled via the entryway switch panel assembly, it receives power
from the airplane’s hot bus system.
PEDESTAL — This potentiometer controls the lighting intensity of
equipment installed in the pedestal. The FMS display intensity is
regulated by the dim button on FMS control panel. Pedestal lighting
receives power from the right main bus and is protected by a circuit
breaker labeled PEDESTAL located within the LIGHTS group on the
copilot’s circuit breaker panel.
CB PANEL — This potentiometer controls the intensity of overlay
lighting to the copilot’s circuit breaker panel. The panel receives 28-vdc
power from the right main bus and is protected by a circuit breaker labeled
R CB located within the LIGHTS group on the copilot’s circuit
breaker panel.
SWITCH LIGHTING
A majority of the switches in the cockpit are push button switches with
lighted indicators. They are designed so that none of the indicators are
illuminated under normal conditions, which supports the “quiet or
dark cockpit” concept. For example, the GEN switches are black (blank)
when the generators are On and OFF illuminates when the generators
are off.
For redundancy, each of the switches contain four bulbs and receive
power from two different sources. The pilot’s Lighting Control Unit
(LCU) supplies power to the two left bulbs and the copilot’s LCU
supplies power to the two right bulbs in most cases. Exceptions to this
are the RAD HOT BUS switch, which receives power from the hot bus,
and the master WARN/CAUT and engine FIRE PUSH switches which
receive power through the Crew Warning Panel (CWP).
A bulb test may be initiated by selecting LTS on the system test knob
(center pedestal) and depressing the PRESS-TO-TEST button.
Pilot’s Manual
PM-132A 4-31
MAP LIGHTS
Two multi-directional, goose-neck map lights are located in the cockpit,
one on each side. Power is provided to each light by the left essential
bus and is protected by a circuit breaker labeled MAP located on the
pilot’s circuit breaker panel in the LIGHTS group. Dimming is
controlled by a rheostat located at the base of each light assembly.
CABIN LIGHTING
Cabin (passenger compartment) lighting consists of entry/exit, overhead,
passenger reading/table, galley cabinet, lavatory (read/vanity)
and NO SMOKING/FASTEN SEAT BELT lights.
Primary cabin lighting control is through the entryway switch panel assembly
which is located on the left storage cabinet just above the main
cabin door entry hand rail. Additional lighting controls are located in
the individual seat passenger lighting control unit (for reading and table
lights), master control panel and the lavatory passenger control
panel assembly.
The master control panel is located in the right mid aft seat storage box
(in the standard configuration). When the menu item indicated by the
Liquid Crystal Display (LCD) is cabin lights, for example, operation of
the SELECT switch provides ON/VARIABLE/OFF control.
Cabin lighting (except entry/exit light and overhead lights) is powered
by the LEFT and RIGHT NON-ESSENTIAL Buses. This arrangement
allows cabin lighting to be used with a GPU powering the non-essential
buses, but with the rest of the electrical system not powered. See GPU
and the non-essential bus system in ELECTRICAL, this section for
more information.
ENTRY/EXIT LIGHTS
The cabin entry/exit door light is installed in the upper door to provide
illumination of the lower door steps and/or ground when both doors
are open. This light is controlled by the ENTRY light switch on the entryway
switch panel assembly and is powered by the hot bus regardless
of the BATT switch position. The light is inoperative when the
upper entry door is closed. The entry/exit light is protected by a circuit
breaker labeled ENTRY, located within the CABIN light group on the
copilot’s circuit breaker panel.
Pilot’s Manual
4-32 PM-132A
OVERHEAD LIGHTS
The overhead lights consist of indirect downwash lighting located
within the convenience panel. Covered by lenses, the overhead lights
are controlled by the CABIN switch on the entryway switch panel assembly
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