|
Definition
|
Contraction
|
Usage
|
|
back course
|
BC
|
GEN
|
|
back course marker
|
BCM
|
GEN
|
|
back taxiing
|
BT
|
ATC
|
|
backing
|
BCKG
|
NWS
|
|
backup emergency communication
|
BUEC
|
GEN
|
|
backup interceptor control
|
BUIC
|
ATC
|
|
Bahama Route
|
BR
|
ATC
|
|
balance
|
BAL
|
GEN
|
|
balloon
|
BLN
|
GEN
|
|
baroclinic or baroclinic prognosis
|
BACLIN
|
NWS
|
|
barometer
|
BRM
|
NWS
|
|
barotropic or barotropic prognosis
|
BATROP
|
NWS
|
|
base leg
|
B
|
ATC
|
|
base of overcast
|
BOVC
|
NWS
|
|
Base Operations Office
|
BASOPS
|
GEN
|
|
basic meteorological services
|
BMS
|
NWS
|
|
beach
|
BCH
|
NWS
|
|
beacon
|
BCN
|
GEN
|
|
beacon data (digitized)
|
BDAT
|
ATC
|
|
bearing
|
BRG
|
GEN
|
|
become
|
BCM
|
GEN
|
|
becoming (expected between 2 digit beginning
hour and 2 digit ending hour)
|
BECMG
|
TAF
|
|
Before
|
BFR
|
GEN
|
|
before dark
|
BFDK
|
NWS
|
|
before encountering IFR conditions
|
BIFR
|
ATC
|
|
before proceeding on course
|
BPOC
|
ATC
|
|
began or begin
|
BGN
|
GEN
|
|
begin or beginning descent
|
BGND
|
ATC
|
|
begin standard refuel orbit
|
BSRO
|
ATC
|
|
beginning climb
|
BC
|
ATC
|
|
beginning of precipitation (time in minutes)
(weather reports only)
|
B
|
NWS
|
|
beginning procedure turn
|
BPT
|
ATC
|
|
beginning standard holding procedure
|
BSHP
|
ATC
|
|
beginning standard range approach
|
BSRAP
|
ATC
|
|
beginning straightin approach
|
BSIAP
|
ATC
|
|
Behind
|
BHND
|
GEN
|
|
Below
|
BLO
|
GEN
|
|
Below
|
BLW
|
ICAO
|
|
below all clouds
|
BAC
|
ATC
|
|
below clouds
|
BLO
|
ICAO
|
|
beneath
|
BNTH
|
GEN
|
|
Bering Standard Time (time groups only)
|
B
|
NWS
|
|
Berkshire
|
BRKSHR
|
NWS
|
|
Bermuda
|
BDA
|
NWS
|
|
Better
|
BTR
|
GEN
|
|
Between
|
BTN
|
ICAO |
|
Between
|
BTWN
|
NWS
|
|
between layers
|
BTL
|
ICAO
|
|
Beyond
|
BYD
|
GEN
|
|
bids accepted for the following vacancies
|
BAFVC
|
GEN
|
|
bids solicited
|
BDSLD
|
GEN
|
|
bids solicited as follows
|
BSAF
|
GEN
|
|
bird sweep completed
|
BSC
|
ATC
|
|
Black Hills
|
BLKHLS
|
NWS
|
|
Blanket
|
BLKT
|
NWS
|
|
Blizzard
|
BLZD
|
NWS
|
|
Block
|
BLX
|
ATC
|
|
Blowing
|
BL
|
METAR
|
|
blowing dust
|
BLDU
|
METAR
|
|
blowing sand
|
BLSA
|
METAR
|
|
blowing snow
|
BLSN
|
METAR
|
|
blowing spray (weather reports only)
|
BY
|
METAR
|
|
Blue
|
B
|
GEN
|
|
Bomber
|
BMBR
|
GEN
|
|
Bombing
|
BOMB
|
GEN
|
|
Border
|
BDR
|
GEN
|
|
Bound
|
BND
|
GEN
|
|
Boundary
|
BDRY
|
ATC
|
|
boundary
|
BNDRY
|
NWS
|
|
braking
|
BRKG
|
ICAO
|
|
braking action
|
BA
|
ICAO
|
|
braking action fair
|
BRAF
|
GEN
|
|
braking action good
|
BRAG
|
GEN
|
|
braking action nil
|
BRAN
|
GEN
|
|
braking action poor
|
BRAP
|
GEN
|
|
branch
|
BR
|
GEN
|
|
break
|
BRK
|
NWS
|
|
breaks in higher overcast
|
BRKHIC
|
NWS
|
|
breaks in overcast
|
BINOVC
|
NWS
|
|
brief
|
BRF
|
NWS
|
|
bright
|
BRGT
|
GEN
|
|
bright radar indicator tower equipment
|
BRITE
|
GEN
|
|
British Columbia
|
BC
|
NWS
|
|
broadcast
|
BCST
|
GEN
|
|
broadcast requested
|
BCREQ
|
ATC
|
|
broadcast station
|
BCSTN
|
GEN
|
|
broken
|
BKN
|
METAR
|
|
build
|
BLD
|
NWS
|
|
building
|
BLDG
|
ICAO
|
|
buildup
|
BLDUP
|
NWS
|
|
bulletin
|
BUL
|
GEN
|
|
bureau
|
BUR
|
GEN
|
|
business
|
BUS
|
GEN
|
|
buzzer (radar)
|
BZR
|
GEN
|
|
by visual reference to the ground
|
VSA
|
ICAO
|
|
by way of
|
VIA
|
GEN
|
|
bytes per second
|
BPS
|
GEN
|
