progress strips, or other written information. As a minimum, provide aircraft identification and
applicable runway, intersection, or taxiway information as follows:
a. Ground control shall tell local control when a leaving aircraft has been taxied to a runway other
than one assigned before as active.
b. Ground control shall tell local control of any aircraft taxied to an intersection for takeoff unless
departure from that intersection is specifically assigned through prior coordination.
c. When the runway in use for landing or leaving aircraft is not visible from the tower or the
aircraft using it is not visible on radar, advise local control or ground control of the aircraft's location
before transferring the aircraft.
7. ISSUE AIR TRAFFIC CONTROL INSTRUCTIONS USING LIGHT GUN SIGNALS
a. Light and Warning Signals
Use ATC light signals from Table 1-1 to control aircraft and the movement of vehicles,
equipment, and personnel on the movement area when radio communications cannot be employed.
Direct a general warning signal to aircraft or vehicle operators, as appropriate, when--
(1) Aircraft are converging and a collision hazard exists.
(2) Mechanical trouble exists of which the pilot might not be aware.
(3) Other hazardous conditions are present that call for intensified pilot or operator alertness.
These conditions may include obstructions, soft field, ice on the runway, and so on.
NOTE: The warning signal is not a prohibitive signal and can be followed by any other light signal as
b. Receiver-Only Acknowledgment
To obtain acknowledgment from an aircraft equipped with only a receiver, request the pilot to do
(1) Between Sunrise and Sunset
Move ailerons or rudders while on the ground. Rock the wings while in flight.