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 Aircraft Lights

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Fly Emirates
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Join date : 2009-09-17
Location : Bandung

PostSubject: Aircraft Lights   Mon Mar 08, 2010 7:59 am

Some of the most important exterior lights carried by
commercial airliners can be seen in the below photo of a Boeing 737.


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[size=12]Boeing 737 showing common types of lights placed on aircraft



The external lights on aircraft fall into two general categories. The first is navigation lights or beacons that
are always illuminated while the aircraft is in operation. A second type includes takeoff and landing lights that
are used to improve visibility when the plane is close to or on the ground. Several of these lights are discussed
in greater detail below.



Navigation lights: All aircraft are equipped with a steady light near the leading edge of each wingtip.
When facing forward from the perspective of the pilot, the light on the right wingtip is green while that on the
left wing is red. The different colors make it possible for an outside observer, such as the pilot of another
aircraft, to determine which direction the plane is flying. These navigation lights are most useful at night when
it is more difficult to tell the direction the plane is going without them.



Navigation or Position lights: In addition to the red and green lights, most planes are also fitted with
other steady white navigation lights in various locations. Large airliners, in particular, will often have such
lighting on the trailing edge of each wingtip. These lights are also sometimes placed along the trailing edges of
the horizontal tail. Another popular location is at the very aft end of the fuselage or at the top of the vertical
tail. One of these latter lights placed along the aircraft centerline is especially common on smaller airliners
and commuter planes. Whatever the location, the purpose of these steady white lights is to improve the plane's
visibility from behind the aircraft.



Anti-Collision Beacon lights: Two beacon lights are fitted to aircraft near the center of the fuselage.
One is located on top of the fuselage and the other on the bottom. These lights are colored reddish orange and
rotate to produce a flashing effect. The beacons are turned on just before the engines are started and they remain
active until the last engine is shut down. The beacons help to serve as a safety warning to ground personnel that
the engines are operational.



Strobe lights: High-intensity strobe lights that flash a white-colored light are located on each wingtip.
Most smaller planes are only equipped with one of these strobes near the leading edge just behind the red or green
navigation light. Larger airliners may be equipped with an additional strobe at the trailing edge as well. These
flashing lights are very bright and intended to attract attention during flight. They are sometimes also used on
the runway and during taxi to make the plane more conspicuous.



Logo lights: These lights are not required but are common on most commercial aircraft. The lights are
usually located on the surface of or at the tips of the horizontal stabilizer. The steady white lights are used
to illuminate the company's logo painted on the vertical tail. While useful for advertising, the primary purpose
of these lights is safety since the bright lights help to make the plane more visible.



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Explanation of the lights used on the MD-11


Wing lights: Many airliners feature lights along the root of the wing leading edge that can be used to
illuminate the wing and engine pylons in flight. These lights may be used to make the plane more visible during
takeoff and landing or to inspect the wings for damage in flight. Pilots can also use the wing lights to inspect
the wings and slats for any ice accretion that might build up when flying through clouds.



Taxi lights: A bright white lamp is located on the nose landing gear strut of most planes. This light is
typically turned on whenever the aircraft is in motion on the ground for greater visibility during taxi, takeoff,
and landing.



Landing lights: Bright white landing lights are usually fitted to most planes for enhanced visibility
during the landing approach. These lights can also be used to illuminate the runway at poorly lit airports. They
are often required for night landings but also commonly used during the day as well to make the plane more
noticeable. While the usage of these lights is common, their location can vary from plane to plane. Landing
lights may be located in the wing root, in the outboard wing, or somewhere along the forward fuselage. Some
aircraft are equipped with multiple sets of landing lights in more than one of these locations. The 737, for
example, has inboard landing lights located in the wing root as well as outboard landing lights in the outboard
flap fairings.



Runway Turnoff lights: Usually located in the leading edge of the wing root, these bright white lamps
are intended to provide side and forward lighting during taxi and when turning off the runway. These lights are
most useful at poorly lit airports but are usually unnecessary. The lights can also be used in flight if
greater visibility is required.



Wheel Well lights: Some planes are equipped with additional lights in the nose and main gear wheel wells.
These lights are provided primarily to assist ground personnel in making pre-flight inspections of a plane at
night.



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Taxi, landing, and turnoff lights visible on the Boeing 777


The locations of some of these lights can be seen in the above photo of a
Boeing 777. To read more about the importance of lighting and aviation
safety, you might want to check out two FAA publications called the
Pilot's
Handbook of Aeronautical Knowledge
and the
Airplane Flying
Handbook
.

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