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AT S ( 1 ) Air Traffic Services
( 2 ) Air Tu r bine Sta rter
( 3 ) Au to th ro t tle Syste m
AT S C Air Traffic Service Com mun ic a t ion
1 2
1 5
B i t A bi n a ry digi t . S m a l lest data unit in a mic ro processor
syste m .
B I T B ui l t - In - Test
B I T E B ui l t - In - Test Equi pme n t
B L K ( 1 ) Black
( 2 ) Block
B M V Brake Me teri ng Va lve
B N R Bi n a ry
B N S Bo un d a ry No t i fic a t ion System (Squi t ter s )
B O C Bo t tom Of Climb
B O M Bill Of Ma teria l
B O P Bit Orie n ted Pro toc ol
B o r e s i g h t i n g The process of align i ng a di rect ional antenna syste m .
B P ( 1 ) BITE P rocessor
( 2 ) Bo t tom Pl ug
B P C U B us Power Con trol Un i t
b p s bi tes per sec on d
B p s Bytes per sec on d
B P S K Bi n a ry Phase Shift Keyi ng
B R Bridge
B R G Bea ri ng
B R I Ba s ic Rate In terface
B R N AV Ba s ic Area Naviga t ion
B R T Brig h tn ess
B S C U Brake System Con trol Un i t
B S N Backbone Subnetwor k
B S P Boa rd Support Pack age
B S U ( 1 ) Beam Steeri ng Un i t
( 2 ) Bypa ss Swi tch Un i t
B T B B us Tie Breaker
B B Ba se Ba n d
B C D Bi n a ry Cod ed Dec i m a l .Ac odi ng system in wh ich
each digit from 0 to 9 is re prese n ted by a four bit
bi n a ry num ber.
B CRS Back Course
B C S Block Check Seque nce. BCS is a cyc l ic code that is
used as refere nce bi ts in an error detect ion process.
B D I Bea ri ng Dista nce In dic a tor
B D M I S B us i n ess Da ta Ma n age ment and Invoic i ng
Beam Wi d t h The beam width is the width of the beam as
mea s u red at the half-power poi n ts of the ra dia ted
s ignal ( W X R ).
B e a r i n g The di rect ion of a point or naviga t ional aid mea s u red
c lockwi se from a refere nce th ro ugh 360 ° .
B E P Back - End Processor
B E P M S Back - End Processor Ma n age ment Syste m
B E R Bi te Error Rate
B F E B uyer Fu rn i s h ed Equi pme n t
B F O Beat Freque ncy Osc i l la tor.An osc i l la tor that produces
a signal to be mixed wi th the rece ived freque ncy to
produce an au di ble beat note, for the purpose of
d ec odi ng the Mor se code id e n t i fier of an NDB. T h e
osc i l la tor produces freque nc ies equal to the sum and
di ffere nce of the com bi n ed freque nc ies.
B G I B us Grant Inh i bi t . A term used in CA PS tra n sfer
b us process i ng.
B G P Bord er Ga teway Pro toc ol
B I B u rn - In
B i G S Bi l i ngual Gro und Sta t ion (ACA RS and V DML 2 )
B i n a r y Ba se-2 coun t i ng syste m . N um bers include 0,1.
B I S Bo un d a ry In termedia te Syste m
B I S M S BIS Ma n age ment Syste m
B I S T B ui l t - In Self Test
1 4
1 7
C A S E C om p u ter Aid ed Softwa re Engi n eeri ng
C AT ( 1 ) C a tegories (I, I I, III) for Vi s i bi l i ty Requi re me n ts
( 2 ) C lear Air Tu r b ule nce
( 3 ) C om p u ter Aid ed Test i ng
CAT I O pera t ional perform a nce Category I.An ILS fac i l i ty
providi ng opera t ion down to a 60 - me ter (200 fee t )
d ec i s ion height and wi th runway visual ra nge not less
than 800 me ters (2600 feet) and a high pro ba bi l i ty of
a p proach success.
CAT I An ILS A p proach to lower- th a n - sta n d a rd Category I
E n h a n c e d and in some cases to Category II, m i n i mum s, ba sed
on guid a nce - to - to uch d own provid ed by a Category
I I I - c a pa ble Head-up Guid a nce Syste m , per FA A O rd er
8400.13.
CAT II O pera t ional perform a nce Category II. An ILS fac i l i ty
providi ng opera t ion down to a 30 - me ter (100 fee t )
d ec i s ion height and wi th runway visual ra nge not less
than 400 me ters (1200 feet) and a high pro ba bi l i ty of
a p proach success.
CAT III a O pera t ional perform a nce Category III a.An ILS fac i l i ty
providi ng opera t ion wi th no dec i s ion height limit to
and along the surface of the runway wi th extern a l
visual refere nce du ri ng final phase of la n di ng and
wi th a runway visual ra nge of not less than 200 me ter s
( 700 fee t ).
CAT III b O pera t ional perform a nce Category III b. An ILS
fac i l i ty providi ng opera t ion wi th no dec i s ion heig h t
limit to and along the surface of the runway wi th o u t
re l ia nce on external visual refere nce; and subseque
n tly ta xi i ng wi th external visual ra nge of not
less than 50 me ters (150 fee t ).
CAT III c O pera t ional perform a nce Category III c. An ILS
fac i l i ty providi ng opera t ion wi th no dec i s ion heig h t
limit to and along the surface of the runway and
　
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