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.
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