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PWR, and R TAXI LT PWR).
NOTE:
On airplanes having ASC 131, the taxi light circuitry is
modiÞed to ensure that the taxi lights extinguish
whenever the landing gear is retracted. For these
airplanes, the ground for the TAXI LIGHTS CONTR
relay is routed through the nose wheel downlock
switch circuit. On airplanes not having ASC 131, the
taxi lights do not automatically extinguish when the
nose gear is retracted, and must be turned off when
not in use.
H. Wingtip Taxi Floodlights:
On airplanes SN 1000-1279 having ASC 1, and SN 1280 and subsequent,
wingtip ßoodlights are installed at the end of each wing, supplementing the
taxi lights, and providing increased assurance of wingtip clearance during
ground operations in low visibility. The wingtip ßoodlights are mounted on
the underside of each wing near the winglet edge and positioned to
illuminate the area beneath the lights.
For airplanes having ASC 1, the wingtip ßoodlights are controlled by the
W/TIP switch (see Figure 8) on the EXTERIOR LTS section of the
overhead panel. With the switch ON, power from the Main #2 28V AC φB
transformer bus power (stepped down from 115V AC) via the WING TIP
TAXI LTS circuit breaker opens the wingtip ßoodlights relay, powering the
left and right wingtip ßoodlights.
For airplanes SN 1280 and subsequent, the wingtip taxi lights consist of a
dual light installation on each wingtip. One of the lights is directed forward
of the wingtip, and the other is directed down, illuminating the area beneath
the wingtip. Control of the dual wingtip light installations is with the TAXI
light switch in the EXTERIOR LIGHTS section of the cockpit overhead
panel. (For SN 1280 and subsequent, the TAXI light switch controls both
the nose wheel taxi lights and the wingtip taxi lights). The lights are
powered by 28V DC from the Left Main DC bus through the WING TIP FLD
LTS circuit breaker.
I. Wheel Well Lights:
A utility light in each wheel well provides illumination for maintenance and
servicing. The lights are interchangeable and are powered by 28V DC from
the Essential DC bus. On airplanes not having ASC 1, the wheel well lights
are controlled by the W WELL switch on the EXTERIOR LTS section of the
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-33-00
Page 29
May 30/02
Revision 7
overhead panel. On airplanes having ASC 1, the wheel well lights are
controlled by a WHEEL WELL LIGHTS switch on the pilot side console. In
addition to these locations, Airplanes 1455 and subsequent also utilize an
externally-mounted wheel well lights switch under the forward external
switch panel access door. Control switches for all three conÞgurations are
shown in Figure 8. When the switch (either) is selected ON, power is
supplied from the 28V Essential DC bus through the WHEEL WELL LTS
circuit breaker, energizing the wheel well lights relay and powering the
nose, left and right main wheel well lights.
J. Ramp Lights:
On airplanes SN 1280 and subsequent, ramp lights are installed to
illuminate the areas around the baggage door and beneath the engine
pylons to facilitate loading and servicing. (The light installation is an
optional feature for airplanes produced prior to SN 1280). The installation
consists of three identical lights, one installed on the underside of the aft
pylon fairings of each engine, and one in the underside of the left engine
pylon above the cargo door. The ramp lights are controlled by the PYLON
LIGHT switch on the panel in the baggage compartment. See Figure 6. The
lights are powered by 28V DC from the Right Main DC bus through the
PYLON LTS circuit breaker on the pilot circuit breaker panel.
K. Logo Lights:
Two logo lights are installed as production standard equipment beginning
with airplane SN 1280. The lights are mounted in the underside of the
horizontal stabilizer on each side and canted inward to illuminate the left
and right sides of the vertical stabilizer. The lights are powered by 115V AC
φC from the Right Main AC bus through the LOGO LTS circuit breaker. The
lights are controlled by the LOGO switchlight on the cockpit overhead
panel, shown in Figure 8.
NOTE:
On airplanes prior to 1280, only the LOGO switchlight
is installed in the overhead panel. Completion of the
circuitry and light installation is at the option of the
operator.
L. Service Panel (Fueling) Lighting:
A dome-type light is installed in the refueling panel as standard equipment
on airplanes SN 1034 and 1156 and subsequent. This feature may be
installed as an option on other airplanes, as well as other service panel
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湾流4操作手册 Gulfstream IV Operating Manual 2(101)
