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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.
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 EN ROUTE FLIGHT ADVISORY
SERVICE.)
(See TRANSCRIBED WEATHER BROADCAST.)
(See WEATHER ADVISORY.)
(Refer to AIM.)
AWW-
(See SEVERE WEATHER FORECAST
ALERTS.)
AZIMUTH (MLS)- A magnetic bearing extending
from an MLS navigation facility.
Note:Azimuth bearings are described as magnetic
and are referred to as “azimuth” in radio telephone
communications.
Pilot/Controller Glossary 7/31/08
2/14/08 Pilot/Controller Glossary
PCG B-1
B
BACK‐TAXI- A term used by air traffic controllers
to taxi an aircraft on the runway opposite to the traffic
flow. The aircraft may be instructed to back‐taxi to
the beginning of the runway or at some point before
reaching the runway end for the purpose of departure
or to exit the runway.
BASE LEG-
(See TRAFFIC PATTERN.)
BEACON-
(See AERONAUTICAL BEACON.)
(See AIRPORT ROTATING BEACON.)
(See AIRWAY BEACON.)
(See MARKER BEACON.)
(See NONDIRECTIONAL BEACON.)
(See RADAR.)
BEARING- The horizontal direction to or from any
point, usually measured clockwise from true north,
magnetic north, or some other reference point
through 360 degrees.
(See NONDIRECTIONAL BEACON.)
BELOW MINIMUMS- Weather conditions below
the minimums prescribed by regulation for the
particular action involved; e.g., landing minimums,
takeoff minimums.
BLAST FENCE- A barrier that is used to divert or
dissipate jet or propeller blast.
BLIND SPEED- The rate of departure or closing of
a target relative to the radar antenna at which
cancellation of the primary radar target by moving
target indicator (MTI) circuits in the radar equipment
causes a reduction or complete loss of signal.
(See ICAO term BLIND VELOCITY.)
BLIND SPOT- An area from which radio
transmissions and/or radar echoes cannot be
received. The term is also used to describe portions
of the airport not visible from the control tower.
BLIND TRANSMISSION-
(See TRANSMITTING IN THE BLIND.)
BLIND VELOCITY [ICAO]- The radial velocity of
a moving target such that the target is not seen on
primary radars fitted with certain forms of fixed echo
suppression.
BLIND ZONE-
(See BLIND SPOT.)
BLOCKED- Phraseology used to indicate that a
radio transmission has been distorted or interrupted
due to multiple simultaneous radio transmissions.
BOUNDARY LIGHTS-
(See AIRPORT LIGHTING.)
BRAKING ACTION (GOOD, FAIR, POOR, OR
NIL)- A report of conditions on the airport
movement area providing a pilot with a degree/
quality of braking that he/she might expect. Braking
action is reported in terms of good, fair, poor, or nil.
　
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