Aeronautical Information Manual (AIM), page 217

Index   216 -- Page 217 -- 218

12/10/15                                                                                                                                 AIM

REFERENCE-                                                                        2. The directions transmitted by a light signal
AIM, Paragraph 4-1-9 , Traffic Advisory Practices at Airports Without
Operating Control Towers                                                     are very limited since only approval or disapproval of
                                                                             a pilot's anticipated actions may be transmitted. No
                                                                             supplement or explanatory information may be
4-3-13. Traffic Control Light Signals                                        transmitted except by the use of the "General
  a. The following procedures are used by ATCTs in                           Warning Signal" which advises the pilot to be on the
the control of aircraft, ground vehicles, equipment,                         alert.
and personnel not equipped with radio. These same                               c. Between sunset and sunrise, a pilot wishing to
procedures will be used to control aircraft, ground                          attract the attention of the control tower should turn
vehicles, equipment, and personnel equipped with                             on a landing light and taxi the aircraft into a position,
radio if radio contact cannot be established. ATC                            clear of the active runway, so that light is visible to the
personnel use a directive traffic control signal which                       tower. The landing light should remain on until
emits an intense narrow light beam of a selected color                       appropriate signals are received from the tower.
(either red, white, or green) when controlling traffic
by light signals.                                                              d. Airport Traffic Control Tower Light Gun
                                                                             Signals. (See TBL 4-3-1.)
  b. Although the traffic signal light offers the
advantage that some control may be exercised over                               e. During daylight hours, acknowledge tower
nonradio equipped aircraft, pilots should be cog-                            transmissions or light signals by moving the ailerons
nizant of the disadvantages which are:                                       or rudder. At night, acknowledge by blinking the
                                                                             landing or navigation lights. If radio malfunction
     1. Pilots may not be looking at the control tower                       occurs after departing the parking area, watch the
at the time a signal is directed toward their aircraft.                      tower for light signals or monitor tower frequency.
                                                                   TBL 4-3-1
                                         Airport Traffic Control Tower Light Gun Signals
                                    Movement of Vehicles,
 Color and Type of Signal          Equipment and Personnel                 Aircraft on the Ground                  Aircraft in Flight
Steady green                    Cleared to cross, proceed or go         Cleared for takeoff                Cleared to land
Flashing green                  Not applicable                          Cleared for taxi                   Return for landing (to be
                                                                                                           followed by steady green at the
                                                                                                           proper time)
Steady red                      STOP                                    STOP                               Give way to other aircraft and
                                                                                                           continue circling
Flashing red                    Clear the taxiway/runway            Taxi clear of the runway in use     Airport unsafe, do not land
Flashing white                  Return to starting point on airport Return to starting point on airport Not applicable
Alternating red and green       Exercise extreme caution            Exercise extreme caution            Exercise extreme caution

4-3-14. Communications                                                       as soon as practical consistent with other ATC
  a. Pilots of departing aircraft should communicate                         REFERENCE-
                                                                             AIM, Paragraph 4-1-13 , Automatic Terminal Information Service
with the control tower on the appropriate ground                             (ATIS)
control/clearance delivery frequency prior to starting                         b. The tower controller will consider that pilots of
engines to receive engine start time, taxi and/or                            turbine-powered aircraft are ready for takeoff when
clearance information. Unless otherwise advised by                           they reach the runway or warm-up block unless
the tower, remain on that frequency during taxiing                           advised otherwise.
and runup, then change to local control frequency
when ready to request takeoff clearance.                                        c. The majority of ground control frequencies are
                                                                             in the 121.6-121.9 MHz bandwidth. Ground control
NOTE-                                                                        frequencies are provided to eliminate frequency
Pilots are encouraged to monitor the local tower frequency                   congestion on the tower (local control) frequency and

Airport Operations                                                                                                                    4-3-17

Page 217 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   216 -- Page 217 -- 218