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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.
(See RUNWAY CONDITION READING.)
BRAKING ACTION ADVISORIES- When tower
controllers have received runway braking action
reports which include the terms “poor” or “nil,” or
whenever weather conditions are conducive to
deteriorating or rapidly changing runway braking
conditions, the tower will include on the ATIS
broadcast the statement, “BRAKING ACTION
ADVISORIES ARE IN EFFECT.” During the time
Braking Action Advisories are in effect, ATC will
issue the latest braking action report for the runway
in use to each arriving and departing aircraft. Pilots
should be prepared for deteriorating braking
conditions and should request current runway
condition information if not volunteered by
controllers. Pilots should also be prepared to provide
a descriptive runway condition report to controllers
after landing.
BREAKOUT- A technique to direct aircraft out of
the approach stream. In the context of close parallel
operations, a breakout is used to direct threatened
aircraft away from a deviating aircraft.
BROADCAST- Transmission of information for
which an acknowledgement is not expected.
(See ICAO term BROADCAST.)
BROADCAST [ICAO]- A transmission of information
relating to air navigation that is not addressed to
a specific station or stations.

2/14/08 Pilot/Controller Glossary
PCG C-1
C
CALCULATED LANDING TIME- A term that may
　
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