gency lighting group illuminates. Activation
periods are limited by a timing circuit to a min-
imum of 10 minutes and a maximum of 12
minutes.
To function automatically, the cockpit switch
must be in the ARM position. Once armed, the
emergency lighting system automatically il-
luminates when normal electrical power is
lost (dual generator failure) or when the pas-
senger oxygen mask deployment occurs. When
the emergency lights are activated automati-
cally, they are limited by the timing circuit or
may be deactivated by the pilot turning the
EMER LIGHTS switch to the OFF position.
The crew is alerted when the airplane is pow-
ered and the emergency lights are not armed.
To indicate this condition, an amber “EMER
LIGHTS” CAS message is illuminated. A
white EMER LIGHTS message is displayed on
the CAS when the EMER LIGHTS switch in
the cockpit is selected ON.
The emergency lights receive power from ei-
ther the main batteries or the emergency bat-
tery. The emergency lights are divided into four
lighting zones (forward, mid-forward, mid-aft,
and aft), and each zone is powered in parallel
from both electrical sources. The emergency
battery is inhibited from supplying power to
the ELS in the air, conserving power for ground
egress illumination. If activated while on the
ground, the emergency lights operate for ap-
proximately 10 minutes to adequately allow
for safe egress. Circuit breaker protection for
the emergency lights is located in the tailcone
on the power distribution panel.
ABNORMAL INTERIOR
LIGHTING CONDITIONS
Single Generator Failure
Following a single generator failure, the air-
plane electrical system automatically sheds the
non-essential busses. Normal power to the
following cabin lighting will be lost; how-
ever, some of the lights can be powered by the
emergency lighting system:
• Lavatory Lights
• Galley Lights
• Reading Lights
To regain full cabin lighting, the non-essen-
tial busses may be reconnected at the discre-
tion of the pilot. Cockpit lighting is not
affected by single generator failure.
Dual Generator Failure
Should the airplane experience dual generator
failure, cockpit interior lighting will be af-
fected in addition to the cabin lighting already
lost with a single generator failure. Illustrated
in Figure 3-11 are the instruments that can
still be illuminated in this situation. All
switch/indicator lights will also continue to op-
erate normally, as will the landing gear indi-
cator lights and the magnetic compass light.
The cockpit flood lights and map lights will re-
main operational as long as the left main bat-
tery stays on line. The Learjet LR GEN FAIL
Checklist tells the crew to turn the flood light
switch ON for night operation. Cockpit light-
ing that will be inoperative with dual genera-
tor failure are the overlay/back lighting for
the pilot and copilot instrument, center
pedestal, and left and right circuit breaker pan-
els.
Additional cabin lighting that is lost with a dual
generator failure are the overhead fluorescent
lights. This is in addition to the list of items
that is lost following a single generator loss.
The emergency lights will operate inflight as
LEARJET 45 PILOT TRAINING MANUAL
3-10
FOR TRAINING PURPOSES ONLY
FlightSafety
international
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