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panel. The lights operate on 28 VDC supplied through one of the
following circuit breakers (depending on aircraft configuration):
READING ITS
This 7.5-amp or 10-amp circuit breaker is located on
the CABIN PWR BUS (overhead panel between the
crew members).
or;
CABIN LTS
This 5.0-amp circuit breaker is located on the copilot's
circuit breaker panel.
ENTRY LIGHT
Cabin entry door lights are installed in the cabinheadliner directly over
the door and in the left service cabinet to illuminate the lower door
steps. The lights in some aircraft are controlled through the STEP
LIGHT rocker switch while in others control is by a membrane-type
switch. Either control is located on the left service cabinetnear the entry
door. The light's circuits are wired to the battery bus through the 5-amp
ENTRY LTS circuit breaker on the pilot's circuit breaker panel. Therefore,
the light is operable regardless of BATTERY switch position.
Learjet 31A
Pilot's Manual
forward
cabin
center
cabin
fights acabin
fights abaggage
fights
Rocker Switches
Membrane-Type Switches
Located near the entry door.
CABIN LIGHTING CONTROLS
Figure 4-7
PM-121
4-29
Change 3
I u I
i L~~ -J' I
I
II II,I
Pilot's Manual
Learjet 31A
BAGGAGE COMPARTMENT LIGHT
Overhead lights are installed in the cabin baggage compartment to provide
illumination of the compartment. The lights in some aircraft are
controlled through the AFT BAGGAGE LIGHTS rocker switch while in
others control is by a membrane-type switch. Either control is located
on the left service cabinet near the entry door. The lights' circuits are
wired to the battery bus through the 5-amp ENTRY ITS circuit breaker
on the pilot's circuitbreaker panel. Therefore, the lights are operable regardless
of BATTERY switch position.
NO SMOKING AND FASTEN SEAT BELT SIGNS
No smoking and fasten seat belt signs are installed in the cabin headliner
immediately aft of the crew compartment and in the aft cabin.
When illuminated, the sign displays 'symbolic representations for no
smoking and fasten seat belts. Illumination of the sign is controlled
through theNO SMOMNG FASTEN SEAT BELT-OFF-FASTEN SEAT
BELT switch on the center switch panel. When the switch is set to NO
SMOKING FASTEN SEAT BELT, both symbols will illuminate. When
the switch is set to FASTEN SEAT BELT, only the fasten seatbelt symbol
will illuminate. Whenever the NO SMOKING FASTEN SEAT BELT
sign (either symbol) illuminates, a tone is generated and sounds
through the cabin speakers. Electrical power to illuminate the signs is
28 VDC supplied through one of the following circuit breakers (depending
on aircraft configuration):
READING US
This 7.5-amp or 10-amp circuit breaker is located on
the CABIN PWR BUS (overhead panel between the
crew members).
or;
CABIN ITS
This 5.0-amp circuit breaker is located on the copilot's
circuit breaker panel.
4-30
PM-121
Change 3
Learjet 31A
Pilot's Manual
EMERGENCY LIGHTING SYSTEM (OPTIONAL) -
EARLY DESIGN
The emergency lighting system provides cabin and exit lighting in the
event of an electrical system failure. The system consists of two emergency
batteries, an upper cabin entry door light, an emergency egress
light, the cabin overhead fluorescent lights, two system switches, and
associated aircraft wiring . The batteries are charged through the 5-amp
EMER LTS circuit breaker on the copilot's circuit breaker panel.
EMER LIGHTSWITCH
TheEMER LIGHTswitch, installed on a panel in the pedestal, provides
the test function for the system and for automatic illumination of the
emergency lights in the event of an interruption of normal electrical
power. The switch has three positions: TEST, ARM, and DISARM. Setting
the switch to TEST simulates a failure of the normal electrical power
system and illuminates the upper cabin entry door light, the
emergency egress light, and the cabin overhead fluorescent lights . Setting
the switch to ARM will arm the system to illuminate the emergency
lights in the event of a failure of the normal electrical system. Setting
the switch to DISARM isolates the emergency lights from the emergency
batteries. The switch should be set to ARM prior to takeoff. If the
switch is in the DISARM position and at least one BATTERY switch is
On, the amber light adjacent to the switch will illuminate to remind the
pilot that the switch should be set to ARM. The switch should be set to
DISARM prior to setting the BATTERY switches OFF
EMERGENCY LTS-NORM SWITCH
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