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channels that distribute power resources to lighting groups.
LEFT CREW LIGHTS PANEL
The L CREW LIGHTS panel is 28-vdc powered from the left essential
bus and protected by a circuit breaker labeled CKPT INSTRS L ESS
PWR, located within the LIGHTS group of circuit breakers on the
pilot’s circuit breaker panel. The four pilot LCU channels control:
• Channels 1 and 2 — Pilot’s instrument panel, overlays, and instruments.
• Channel 3 — Pilot’s circuit breaker panel.
• Channel 4 — Left side bulbs for switch lighting.
Following is a description of each of the potentiometer controls located
on the L CREW LIGHTS panel.
OVRHD — The pilot’s overhead swivel light is controlled by the
OVRHD potentiometer. The pilot overhead light can also be turned on
with the COCKPIT switch on the entryway switch panel assembly
when the cabin door is open and the OVRHD control is off. 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 pilot’s overhead light is controlled via the entryway switch
panel assembly, it receives power from the airplane hot bus system.
INSTR — The pilot’s instrument panel lighting is controlled via the
INSTR potentiometer. Display units and the radio management units
have internal lighting, and the intensity is controlled through sensors
and controls. The bezel controller backlighting for these units are
controlled by the INSTR control, however. The pilot’s instrument panel
lights receive 28-vdc power from the left main bus and are protected by
a circuit breaker labeled L INSTR located within the LIGHTS group on
the pilot’s circuit breaker panel.
Pilot’s Manual
4-28 PM-126A
FLOOD — The entire instrument panel can be illuminated by a floodlight
located beneath the glareshield. Dimming is controlled via this
potentiometer. Power to the floodlight is from the left essential bus and
is protected by the FLOOD circuit breaker within the LIGHTS group on
the pilot’s circuit breaker panel.
CB PANEL — This potentiometer controls the intensity of overlay
lighting on the pilot’s circuit breaker panel. The panel receives 28-vdc
power from the left main bus and is protected by a circuit breaker
labeled L CB located within the LIGHTS group on the pilot’s circuit
breaker panel.
RIGHT CREW LIGHTS PANEL
The R CREW LIGHTS panel is 28-vdc powered from the right main bus
and protected by a circuit breaker labeled CKPT INSTRS R ESS PWR,
located within the LIGHTS group of circuit breakers on the copilot’s circuit
breaker panel. The four copilot LCU channels control:
• Channels 1 and 2 — Copilot’s instrument panel and glareshield overlays,
instruments, and pedestal overlays.
• Channel 3 — Copilot’s circuit breaker panel.
• Channel 4 — Right side bulbs for switch lighting.
Following is a description of each of the potentiometer controls located
on the R CREW LIGHTS panel.
INSTR — The copilot’s instrument panel lighting is controlled via the
INSTR potentiometer. Display units and the radio management units
have internal lighting, and the intensity is controlled through sensors
and controls. The bezel controller backlighting for these units is
controlled by the INSTR control, however. The copilot’s instrument
panel lights receive 28-vdc power from the right main bus and is
protected by a circuit breaker labeled R INSTR located within the
LIGHTS group on the copilot’s circuit breaker panel.
Pilot’s Manual
PM-126A 4-29
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
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