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typically selectable by microphone clicks, on the
UNICOM frequency. Availability will be published
in the Airport/Facility Directory and approach charts.
AUTOMATIC ALTITUDE REPORT-
(See ALTITUDE READOUT.)
AUTOMATIC ALTITUDE REPORTING- That
function of a transponder which responds to Mode C
interrogations by transmitting the aircraft's altitude
in 100‐foot increments.
AUTOMATIC CARRIER LANDING SYSTEMU.
S. Navy final approach equipment consisting of
precision tracking radar coupled to a computer data
link to provide continuous information to the aircraft,
monitoring capability to the pilot, and a backup
approach system.
AUTOMATIC DEPENDENT SURVEILLANCE
(ADS) [ICAO]- A surveillance technique in which
aircraft automatically provide, via a data link, data
derived from on-board navigation and position
fixing systems, including aircraft identification, four
dimensional position and additional data as
appropriate.
AUTOMATIC DEPENDENT SURVEILLANCEBROADCAST
(ADS‐B)- A surveillance system in
which an aircraft or vehicle to be detected is fitted
with cooperative equipment in the form of a data link
transmitter. The aircraft or vehicle periodically
broadcasts its GPS-derived position and other
information such as velocity over the data link, which
is received by a ground-based transmitter/receiver
(transceiver) for processing and display at an air
traffic control facility.
(See GLOBAL POSITIONING SYSTEM.)
(See GROUND-BASED TRANSCEIVER.)
AUTOMATIC DEPENDENT SURVEILLANCECONTRACT
(ADS-C)- A data link position
reporting system, controlled by a ground station, that
establishes contracts with an aircraft's avionics that
occur automatically whenever specific events occur,
or specific time intervals are reached.
AUTOMATIC DIRECTION FINDER- An aircraft
radio navigation system which senses and indicates
the direction to a L/MF nondirectional radio beacon
(NDB) ground transmitter. Direction is indicated to
7/31/
2/14/PCG A-16
the pilot as a magnetic bearing or as a relative bearing
to the longitudinal axis of the aircraft depending on
the type of indicator installed in the aircraft. In certain
applications, such as military, ADF operations may
be based on airborne and ground transmitters in the
VHF/UHF frequency spectrum.
(See BEARING.)
(See NONDIRECTIONAL BEACON.)
AUTOMATIC FLIGHT INFORMATION
SERVICE (AFIS) - ALASKA FSSs ONLY- The
continuous broadcast of recorded non-control
information at airports in Alaska where a FSS
provides local airport advisory service. The AFIS
broadcast automates the repetitive transmission of
essential but routine information such as weather,
wind, altimeter, favored runway, breaking action,
airport NOTAMs, and other applicable information.
The information is continuously broadcast over a
discrete VHF radio frequency (usually the ASOS
frequency.)
AUTOMATIC TERMINAL INFORMATION
SERVICE- The continuous broadcast of recorded
noncontrol information in selected terminal areas. Its
purpose is to improve controller effectiveness and to
relieve frequency congestion by automating the
repetitive transmission of essential but routine
information; e.g., “Los Angeles information Alfa.
One three zero zero Coordinated Universal Time.
Weather, measured ceiling two thousand overcast,
visibility three, haze, smoke, temperature seven one,
dew point five seven, wind two five zero at five,
altimeter two niner niner six. I‐L‐S Runway Two Five
Left approach in use, Runway Two Five Right closed,
advise you have Alfa.”
(See ICAO term AUTOMATIC TERMINAL
INFORMATION SERVICE.)
(Refer to AIM.)
AUTOMATIC TERMINAL INFORMATION
SERVICE [ICAO]- The provision of current, routine
information to arriving and departing aircraft by
means of continuous and repetitive broadcasts
throughout the day or a specified portion of the day.
AUTOROTATION- A rotorcraft flight condition in
which the lifting rotor is driven entirely by action of
the air when the rotorcraft is in motion.
a. Autorotative Landing/Touchdown Autorotation.
Used by a pilot to indicate that the landing will
be made without applying power to the rotor.
b. Low Level Autorotation. Commences at an
altitude well below the traffic pattern, usually below
100 feet AGL and is used primarily for tactical
military training.
c. 180 degrees Autorotation. Initiated from a
downwind heading and is commenced well inside the
normal traffic pattern. “Go around” may not be
possible during the latter part of this maneuver.
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