4-3-23. Use of Aircraft Lights
a. Aircraft position lights are required to be lighted on aircraft
operated on the surface and in flight from sunset to sunrise. In
addition, aircraft equipped with an anti-collision light system are
required to operate that light system during all types of operations
(day and night). However, during any adverse meteorological
conditions, the pilot-in-command may determine that the anti-collision
lights should be turned off when their light output would constitute a
hazard to safety (14 CFR Section 91.209). Supplementary strobe lights
should be turned off on the ground when they adversely affect ground
personnel or other pilots, and in flight when there are adverse
reflection from clouds.
b. An aircraft anti-collision light system can use one or more
rotating beacons and/or strobe lights, be colored either red or white,
and have different (higher than minimum) intensities when compared to
other aircraft. Many aircraft have both a rotating beacon and a strobe
light system.
c. The FAA has a voluntary pilot safety program, Operation Lights On,
to enhance the see-and-avoid concept. Pilots are encouraged to turn on
their landing lights during takeoff; i.e., either after takeoff
clearance has been received or when beginning takeoff roll. Pilots are
further encouraged to turn on their landing lights when operating
below 10,000 feet, day or night, especially when operating within 10
miles of any airport, or in conditions of reduced visibility and in
areas where flocks of birds may be expected, i.e., coastal areas, lake
areas, around refuse dumps, etc. Although turning on aircraft lights
does enhance the see-and-avoid concept, pilots should not become
complacent about keeping a sharp lookout for other aircraft. Not all
aircraft are equipped with lights and some pilots may not have their
lights turned on. Aircraft manufacturer's recommendations for
operation of landing lights and electrical systems should be observed.
d. Prop and jet blast forces generated by large aircraft have
overturned or damaged several smaller aircraft taxiing behind them. To
avoid similar results, and in the interest of preventing upsets and
injuries to ground personnel from such forces, the FAA recommends that
air carriers and commercial operators turn on their rotating beacons
anytime their aircraft engines are in operation. General aviation
pilots using rotating beacon equipped aircraft are also encouraged to
participate in this program which is designed to alert others to the
potential hazard. Since this is a voluntary program, exercise caution
and do not rely solely on the rotating beacon as an indication that
aircraft engines are in operation.
e. Prior to commencing taxi, it is recommended to turn on navigation,
position, anticollision, and logo lights (if equipped). To signal
intent to other pilots, consider turning on the taxi light when the
aircraft is moving or intending to move on the ground, and turning it
off when stopped or yielding to other ground traffic. Strobe lights
should not be illuminated during taxi if they will adversely affect
the vision of other pilots or ground personnel.
f. At the discretion of the pilotincommand, all exterior lights
should be illuminated when taxiing on or across any runway. This
increases the conspicuousness of the aircraft to controllers and other
pilots approaching to land, taxiing, or crossing the runway. Pilots
should comply with any equipment operating limitations and consider
the effects of landing and strobe lights on other aircraft in their
vicinity.
g. When entering the departure runway for takeoff or to “line up and
wait,” all lights, except for landing lights, should be illuminated to
make the aircraft conspicuous to ATC and other aircraft on approach.
Landing lights should be turned on when takeoff clearance is received
or when commencing takeoff roll at an airport without an operating
control tower.