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AZIMUTH, MICROWAVE LANDING SYSTEM - A magnetic bearing extending from a Microwave Landing System navigation facility.
NOTE: Azimuth bearings are described as magnetic and are referred to as "azimuth" in radio telephone communications.
BACK-TAXI (P/CG) - 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)
BASIC AREA NAVIGATION (BRNAV) - RNAV with an accuracy equivalent to RNP-5 for operations under IFR in European airspace.
BEACON - (See Radar, Non Directional Beacon, Marker Beacon, Airport Rotating Beacon, Aeronautical Beacon, Airway Beacon)
BEACON (JCS) - A light or electronic source which emits a distinctive or characteristic signal used for the determination of bearings, courses, or location.
BEARING (P/CG) - 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)
BEARING (JCS, NATO) - The horizontal angle at a given point measured clockwise from a specific reference datum to a second point.
BELOW MINIMUMS - Weather conditions below the minimums prescribed by regulation for the particular action involved, e.g., landing minimums, take-off minimums.
BIRDTAMS - Represent birdstrike risk warnings and range in intensity level from  0 (nil birdstrike risk) to 8 (extremely great birdstrike risk). BIRDTAMS cover central Europe and are sent to aircrews through ATIS or ATC.
BLAST FENCE - A barrier that is used to divert or dissipate jet or propeller blast.
BLIND SPEED (P/CG) - 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.
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 SPOT/BLIND ZONE - An area from which radio transmissions and/or radar echoes cannot be received. The term is also used to described portions of the airport not visible from the control tower.
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 degrees/quality of braking that he 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, Air Traffic Control 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.
BRASS MONKEY, EUROPE - A Nickname transmitted by Ground Radar Units to warn aircrews of an impending border violation and which requires immediate positive actions by all aircrews receiving the transmission.
BROADCAST (P/CG) - Transmission of information for which an acknowledgement is not expected.
　
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