automating the repetitive transmission of essential but routine information. Functional checks should be
performed on ALL air traffic control facility equipment to ensure proper operation.
PART A--AIRFIELD LIGHTING BETWEEN SUNSET AND SUNRISE
The primary purpose of the rotating beacon is to identify the airport's location during darkness.
Rotating beacon lights alternate between white and green. A twin or split white light shows a military
airport. A solid white light shows a civilian airport. The on-off switch is normally located in the control
tower. Therefore, control tower operators are responsible for operating the beacon continuously
between sunset and sunrise and during instrument meteorological conditions.
OBSTRUCTIONS AND APPROACH LIGHTS
If controls are provided, turn the obstruction lights on between sunset and sunrise. These lights
provide visual guidance to landing aircraft by radiating light beams in a directional pattern. This pattern
ques the aviator to align the aircraft with the extended centerline of the runway on his final approach for
landing. Approach lights begin at the runway threshold and extend outward into the approach zone.
Operate the approach lights between sunset and sunrise when--
a. The aviator requests them.
b. They serve the landing runway.
c. You think it necessary (if not contrary to the aviator's request).
d. They serve a runway to which an approach is being made but the aircraft will land on another
There are certain times at which you must turn on the runway lights serving the runway in use.
Those times are listed below.
a. Turn on the lights when you consider it necessary and as required by facility directives.
b. Turn on the lights when requested by the pilot and no other known aircraft will be affected.