Learjet 60 - Exterior Lighting; Landing;Taxi Lights; Navigation Lights

Learjet60

Pilot's Manual
EXTERIOR LIGHTING
LANDING/TAXI LIGHTS
A landing/taxi light
is
installed on each main landing gear
. The lights
are controlled by the LDG LT switches on the center switch
panel . The
LDG LT switches have
three positions : On (L and R), TAXI, and OFF .
The landing light control circuits are wired through the main gear
down-and-locked switches ; therefore, the landing lights are inopera-
tive when the landing gear is not down and locked . When the LDG LT
switches are placed in the
On position, control circuits apply full 28
VDC to the landing lights and the lights will illuminate full bright .
When
be LDG LT
switches
are in the TAXI position, resistors shunt the
lamp input power to 21 VDC and the lights are dimmed .
In order to ex-
tend the service life
of me
lamps, it is recommended that the light be
used as sparingly as possible in the LDG LT mode . The lampsand con-
trol circuits are supplied electrical power through 20-amp current
limners
.
Some aircraft are equipped with a pulsating landing light option which
is used in conjunction with the pulsating recognition light . On these air-
craft, a pulse controller unit controls the landing lights by delivering
pulsating DC current at approximately 45 cycles per minute
. The effect
of this pulsating current is to cause the bulb's brightness to continually
vary between approximately 40% and 100% of full bright . The pulsat-
ing feature is activated when the RECOG light switch is set to the
PULSE position, the applicable LDG LT switch is OFF
and the landing
gear is down and locked . When me LDG LT switch is positioned to On
or TAXI,
the landing/ taxi lights will illuminate steadily .
NAVIGATION LIGHTS
Navigation lights are installed in the forward portion of the wing tips
and in the vertical stabilizer upper aft fairing (bullet) . The lights are
controlled through the NAV switch in the LIGHTS group on the center
switch panel . When the NAV light switch is placed in the On (NAV) po-
sition, the navigation lights will illuminate . Additionally, setting the
NAV light switch to On (NAV) activates two-stage dimming and cer-
tain cockpit lights are automatically dimmed . Refer to TWO-STAGE
DIMMING, this section . Electrical power for the
navigation
light is 28
VDC supplied through the 7 .5-amp NAV LTS circuit breaker on the pi-
lot's circuit breaker panel .
PM-13 . 3
Change 4
4-20A