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Pilot/Controller Glossary

3/29/18

PCG A−16

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 SER-

VICE (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, braking action,

airport NOTAMs, and other applicable information.

The information is continuously broadcast over a

discrete VHF radio frequency (usually the ASOS/

AWSS/AWOS frequency).

AUTOMATIC TERMINAL INFORMATION SER-

VICE− 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 SER-

VICE [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 Autorota-

tion. 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.
AVAILABLE LANDING DISTANCE (ALD)− The

portion of a runway available for landing and roll-out

for aircraft cleared for LAHSO. This distance is

measured from the landing threshold to the

hold-short point.
AVIATION WEATHER SERVICE− A service

provided by the National Weather Service (NWS) and

FAA which collects and disseminates pertinent

weather information for pilots, aircraft operators, and

ATC. Available aviation weather reports and

forecasts are displayed at each NWS office and FAA

FSS.

(See TRANSCRIBED WEATHER BROADCAST.)
(See WEATHER ADVISORY.)
(Refer to AIM.)

AWW−

(See SEVERE WEATHER FORECAST

ALERTS.)