A . . . . 2
B . . . . . . 13
C . . . . . . . . 16
D . . . . . . . . . . . . 24
E . . . . . . . . 31
F . . . . . . . . 37
G . . . . 42
H . . . . 45
I . . . . 48
J . . . . . . . 53
K . . . . . . 54
L . . . . . . 54
M . . . . 58
N . . . . 65
O . . . . . 69
P . . . . 72
Q . . . . . 80
R . . . . . 80
S . . . . . . 86
T . . . . . . . 96
U . . . . . . . . 104
V . . . . 105
W . . . . 109
X . . . . 111
Y . . . . . . . . 112
Z . . . . . . . . 112
*Av i o n ics-ese. Sometimes called Av - s p e a k . I t ’s a confusing, sometimes frustrating language.
T h a t ’s why your friends at Rockwell Collins created this handy compendium of acronyms, terms and definitions.
We hope it helps.
Copyright © 2001 Rockwell Collins, Inc.
w w w. ro c k w e l l c o l l i n s . c o m
C O N T E N T S O F G L O S S A R Y
A VIONICS G LOSSARY
How to Speak Avionics-ese*
3
A c c l r m Acce lerome ter
AC C T S Avia t ion Coordi n a t i ng Com m i t tee for Te lec om mun ic a t ions Services
AC E ( 1 ) The con trol ch a racter mea n i ng tech n ical ackn owledge
( 2 ) Act u a tor Con trol Electron ic s ( 3 ) Adva nced Cert i fic a t ion Equi pme n t AC F Area Con trol Fac i l i ty
AC I D Ai rc raft Id e n t i fic a t ion
AC I P S Ai rfoil and Cowl Ice Pro tect ion Syste m AC K The con trol ch a racter mea n i ng tech n ical
ackn owledge ment of an upl i nk, used in an ACA RS syste m
AC M P A l tern a t i ng Current Mo tor Pum p AC M S Ai rc raft Con di t ion Mon i tori ng Syste m
AC P Au dio Con trol Panel
AC S ( 1 ) Act ive Con trol Syste m ( 2 ) Au dio Con trol Syste m
AC S G Aeron au t ical Com mun ic a t ions Sub-Gro u p
AC T Act ive
AC U ( 1 ) A pron Con trol Un i t ( 2 ) An tenna Con trol Un i t ( 3 ) Au to pi lot Con trol Un i t
A / D An a log - To - D igi ta l A D Adm i n i stra t ive Dom a i n
A DA C om p u ter Progra m m i ng Langu age
A DA S Au tom a ted Wea th er Observi ng System Da ta Acqui s i t ion Syste m
A D C Air Da ta Com p u ter
A D F Au tom a t ic Direct ion Fi n d er A D I Attitude Director In dic a tor 3 - D, 4-D T h ree or four di me n s ion
4096 Code The octal ba se, fo u r- digit code used be tween fra m i ng p ul ses of a re ply to id e n t i fy the airc raft or for ge n era l use and emerge ncy cod es (XPD )
1 0 B a s e T 10 Mbps ba se band data tra n s m i ss ion over twi sted c o p per wi re
A ( 1 ) Au to t un ed NAVAID
( 2 ) Am peres
A AC Aeron au t ical Adm i n i stra t ive Com mun ic a t ion s A A D Ass ign ed Altitude Devia t ion
A A I Ai rline Avion ics In st i t u te A A L Above Aerod ome Leve l
A A M P Adva nced Arch i tect u re Mic ro - P rocessor A AT S Avia t ion and Air Traffic Services
A AT T Adva nced Avia t ion Tra n s porta t ion Tech n ology
A / B Au to brake
A B E A R INC 429 Bus Emula tor A B M Asynch ron o us Ba la nced Mod e
A- B P S K ( 1 ) Aeron au t ical Bi n a ry Phase Shift Keyi ng ( 2 ) Avia t ion Bi n a ry Phase Shift Keyi ng A B R V Ab brevia t ion
A B S Absol u te
AC ( 1 ) Advi sory Circula r
( 2 ) A l tern a t i ng Curre n t
A / C Ai rc raft
AC A Ad dress Com press ion A lgori thm AC AC Ai r- C ooled Air Cooler
AC A S Ai r borne Col l i s ion Avoid a nce Syste m AC A R S Ai rc raft Com mun ic a t ions Ad dress i ng and
Re port i ng Syste m
AC C ( 1 ) Act ive Clea ra nce Con trol ( 2 ) Area Con trol Center
2
A F Ai rway Fac i l i t ies
A F C ( 1 ) Au tom a t ic Freque ncy Com pe n sa t ion ( 2 ) Au tom a t ic Freque ncy Con trol
A F C A S Au tom a t ic Fl ight Con trol Augme n ta t ion Syste m A F C S Au tom a t ic Fl ight Con trol Syste m
A F D ( 1 ) Ad a p t ive Fl ight Display ( 2 ) Adva nced Fl ight Deck ( 3 ) Au to pi lot Fl ight Director A F D C Au to pi lot Fl ight Director Com p u ter A F D S Au to pi lot Fl ight Director Syste m A F E P S ACA RS Front End Process i ng Syste m A F I Au th ori ty Format Id e n t i fier
A F I S ( 1 ) Ai r borne Fl ight Inform a t ion Syste m ( 2 ) Au tom a t ic Fl ight Inform a t ion Service A F M Ai rc raft Fl ight Ma nu a l
A F N ATS Fac i l i t ies No t i fic a t ion A F S ( 1 ) Aeron au t ical Fi xed Service
( 2 ) Ai r borne Fi le Server ( 3 ) Au tom a t ic Fl ight Syste m A F S S Au tom a t ic Fl ight Service Sta t ion A F S K Au dio Freque ncy Shift Keyi ng
A F T N Aeron au t ical Fi xed Te lec om mun ic a t ion s A F T R C C Aeros pace and Fl ight Text Radio Coordi n a t i ng
C o unc i l A / G Ai r / G ro un d
AG AC S Au tom a t ic Gro un d - Air Com mun ic a t ion Syste m . It is also kn own as ATC SS or DATA LIN K.
AG AT E Adva nced Ge n eral Avia t ion Tra n s port Experi me n t AG C Au tom a t ic Gain Con trol . AGC is used to maintain
the output level of the rece iver.
AG I S Air Gro und In termedia te Syste m A D I R S Air Da ta In ert ial Refere nce Syste m
A D I R U Air Da ta In ert ial Refere nce Un i t A D L Aeron au t ical Da ta Link
A DLP ( 1 ) Ai r borne Da ta Link Pro toc ol ( 2 ) Ai rc raft Da ta Link Processor A D L S Aeron au t ical Da ta Link Services
A D M Air Da ta Module
A D M S Ai rline Da ta Ma n age ment Syste m A D P Air Da ta Processor
A D R A S Ai rplane Da ta Rec overy and An a lysis Syste m A D S ( 1 ) Air Da ta Syste m
( 2 ) Au tom a t ic De pendent Surve i l la nce A D S-A Au tom a t ic De pendent Surve i l la nce – Ad dress A D S- B Au tom a t ic De pendent Surve i l la nce – Broa d c a st A D S E L Ad dress Se lect ive. A SSR system electron ic a l ly
a rra nged to address each tra n s pon d er se lect ive ly.
O nly a pa rt icular tra n s pon d er will res pon d, th us avoidi ng ga r bl i ng. A DSE L uses a mon o p ul se tech n ique to provide more accu ra te bea ri ng mea s u re me n t . A DSE L is com pa t i ble wi th DA BS. ( Refer to Mode S tra n s pon d er s.)
A D S P Au tom a t ic De pendent Surve i l la nce Pa n e l A D S U ( 1 ) Au tom a t ic De pendent Surve i l la nce Syste m
( 2 ) Au tom a t ic De pendent Surve i l la nce Un i t A D T N Adm i n i stra t ive Da ta Tra n s m i ss ion Ne twor k A E C U Au dio Electron ic Con trol Un i t
A E E C Ai rl i n es Electron ic Engi n eeri ng Com m i t tee A E P ( 1 ) Au dio En terta i nment Player
( 2 ) Au to pi lot Engage Pa n e l A E R A Au tom a ted En Ro u te traffic con trol A E S Ai rc raft Earth Sta t ion
A E U Auxi l ia ry Equi pment Un i t
7
A I T Adva nced In te l l ige nce Ta pe - used for the storage of digi tal vid eo and au dio fi les
A I V Accumula tor Isola t ion Va lve A I X Adva nced In teract ive Execu t ive A J P S AFE PS Jo u rnal Process i ng Syste m
A / L Au tola n d
A L C Au tom a t ic Level Con trol . A c i rcuit used to maintain the output of a tra n s m i t ter rega rdless of va ria t ions in the atte nu a t ion of the syste m .
A L E Au tom a t ic Link Esta bl i s hme n t A L I A l t i me ter
A L PA Ai rline Pilo ts Assoc ia t ion A L S A p pl ic a t ion Layer Struct u re A L S I P C lea r
A LT ( 1 ) Ai r borne Link Term i n a l ( 2 ) A l tern a te
( 3 ) A l t i me ter ( 4 ) A l t i t u d e A LT HOLD Altitude Hold Mod e
A l t i t u d e He ight determ i n ed by ba rome tric press u re Altitude A c on t i nu o us re t u rn ac ross the di s play at a ra nge R i n g equiva lent to airc raft altitude (WXR)
A LT S Altitude Se lect
A L U Ari thme t ic and Logic Un i t
A M Am plitude Modula t ion . A s ignal wh ere the carrier s ignal is va ried in amplitude to enc ode voice or d a ta inform a t ion .
A M A S S Ai rport Move ment Area Safe ty Syste m A M C Avion ics Ma i n te n a nce Confere nce
A M C P Aeron au t ical Mo bi le Com mun ic a t ions Pa n e l
A M E Am plitude Modula t ion Equiva le n t . An AM type sign a l that processes the modula ted inform a t ion signal and c a rrier freque ncy se pa ra te ly and then rec on structs the two signals to make an equiva lent AM sign a l .
AG L Above Gro und Leve l
AG R Ai r / G ro und Ro u ter
AG R M Ai r / G ro und Ro u ter Regional Ma n ager AG R M S Ai r / G ro und Ro u ter Ma n age ment Syste m AG S Ai r / G ro und Syste m
AG S S ACA RS Gro und System Sta n d a rd (AEEC ) AGT S Ai r / G ro und Test Sta t ion
A H C Attitude Hea di ng Com p u ter A H R S Attitude Hea di ng Refere nce Syste m A I ( 1 ) A l tern a t ive In terroga tor
( 2 ) Art i fic ial In te l l ige nce
A I C Aeron au t ical Inform a t ion Circula r
A I D A l tered Item Drawi ng. A drawi ng that details wh a t a l tera t ion or ch a nge is made to an alrea dy exi st i ng c om pon e n t .E xa m ples may be shorte n i ng the shaft of a va ria ble res i stor, or addi ng a program to a circui t c a rd to produce a progra m med circuit card.
A I D C Air Traffic Services (ATS) In ter- Fac i l i ty Da ta C om mun ic a t ion s
A I D S Ai rc raft In tegra ted Da ta Syste m
A I E M Ai rl i n es In tern a t ional Electron ics Mee t i ng A I M S Ai rc raft Inform a t ion Ma n age ment Syste m A I N S C Aeron au t ical In dustry Service Com mun ic a t ion s A I P Aeron au t ical Inform a t ion Publ ic a t ion
A I R AC Aeron au t ical Inform a t ion Regula t ion and Con trol A I R C O M D igi tal air/gro und com mun ic a t ions services provid ed
by SITA . A system similar to ACA RS.
AIR DATA T h ose pa ra me ters that can be derived from kn owledge of the air mass surro un di ng the airc raft . A I R M E T Ai rm a n’s Me teorological (Inform a t ion )
A i r w a y s The sta n d a rd ICAO IFR ro u tes A I S Aeron au t ical Inform a t ion Services
6
AO D C Age Of Da ta , C lock (GPS term ) AO D E Age Of Da ta , E p h e meris (GPS term )
AO G Ai rc raft On Gro un d
AO H E Air/Oil Heat Exch a nger AO M Ai rc raft Opera t i ng Ma nu a l AO P ( 1 ) Aeron au t ical OSI Profi le
( 2 ) Ai rline Opera t ional Procedu re AO PA Ai rc raft Own ers and Pilo ts Assoc ia t ion AO P G Aerodrome Opera t ions Gro u p
AO R Atla n t ic Ocean Region
AO R- E Atla n t ic Ocean Region - E a st AO R-W Atla n t ic Ocean Region -West
A / P Au to pi lo t . A c om p u ter com m a n d ed system for c on trol l i ng airc raft con trol surfaces.
A P Ai rport Loc a t ion (ACA RS / AFERS ) A PA ( 1 ) A l l ied Pilo ts Assoc ia t ion
( 2 ) Au to pi lot Am pl i fier A P B Auxi l ia ry Power Breaker A P C ( 1 ) Au to pi lot Com p u ter
( 2 ) Aeron au t ical Publ ic Corres pon d e nce ( 3 ) Aeron au t ical Pa sse nger Com mun ic a t ion A P I A p pl ic a t ion Progra m m i ng In terface
A P M S Au tom a ted Perform a nce Mea s u re ment Syste m A P N A R INC Packet Ne twor k
A P P ( 1 ) A p proach Con trol ( 2 ) Au to pi lot Pa n e l
A P P R A p proach
A P R Actual Perform a nce Reserve A P R L ATN Profi le Requi re ment List A P S Au to pi lot Syste m
A P U Auxi l ia ry Power Un i t A M I Ai rline Modi fia ble Inform a t ion
A M L C D Act ive Ma trix Liquid Crystal Display A M M Ai rc raft Ma i n te n a nce Ma nu a l A M P Au dio Ma n age ment Pa n e l A M S ( 1 ) A pron Ma n age ment Service
( 2 ) Avion ics Ma n age ment Service
A M S ( R ) S Aeron au t ical Mo bi le Sa te l l i te (Ro u te) Service A M S S Aeron au t ical Mo bi le Sa te l l i te Service
A M TO S S Ai rc raft Ma i n te n a nce Task Orie n ted Support Syste m . An au tom a ted data re trieval syste m .
A M T S Aeron au t ical Message Tra n sfer Service A M U Au dio Ma n age ment Un i t
A M U X Au dio Mul t i plexer
A N C Air Naviga t ion Com m i ss ion (ICAO )
A n e r o i d An evacu a ted and sea led caps ule or be l lows th a t C a p s u l e expa n ds or con tracts in res pon se to ch a nges in press u re.
A N I C S A laskan NAS In terfac i l i ty Com mun ic a t ion Syste m A N L P A R INC Ne twork Layer Pro toc ol
A N P Actual Naviga t ion Perform a nce A N S ( 1 ) Am bient Noi se Se n sor
( 2 ) Area Naviga t ion Syste m
A N S I American Na t ional Sta n d a rds In st i t u te
A N T An te n n a
A N TC Adva nced Ne twor ki ng Test Center
AOA Ang le Of At tack
AO C ( 1 ) Aeron au t ical Opera t ional Con trol ( 2 ) Ai rc raft Opera t ional Con trol ( 3 ) Ai rline Opera t ional Con trol ( 4 ) Ai rport Obstruct ion Ch a rt
( 5 ) Ai rport Opera t ional Com mun ic a t ion s AO C C Ai rline Opera t ion Con trol Center
AO D Au dio on De m a n d
1 1
A S C I I American Sta n d a rd Code for Inform a t ion In terch a nge A S C P C Air Supply and Cabin Press u re Con trol ler s
A S D Ai rc raft Situation Display
A S D E Ai rport Surface De tect ion Equi pme n t A S D L Aeron au t ical Sa te l l i te Da ta Link A S E A l t i me try System Error
A S E C N A Age ncy for the Secu ri ty of Aerial Naviga t ion in Africa and Ma d aga sc a r
A S G A R INC Signal Ga teway A S I Avion ics System In tegra t ion
A S I C A p pl ic a t ion Spec i fic In tegra ted Circui t A S M ( 1 ) Ai r s pace Ma n age me n t
( 2 ) Au to th ro t tle Servo Mo tor A S N. 1 Abstract Syn tax No ta t ion One A S O S Au tom a ted Surface Observi ng Syste m A S P ( 1 ) Altitude Set Pa n e l
( 2 ) Aeron au t ical Fi xed Service (AFS) Syste m s Pla n n i ng for data interch a nge
A S P P Aeron au t ical Fi xed Service (AFS) Systems Pla n n i ng for data interch a nge Pa n e l
A-S M G C S Adva nced Surface Move ment Guid a nce and C on trol Syste m s
A S R Ai rport Surve i l la nce Radar A S R S Avia t ion Safe ty Re port i ng Syste m
A S S TC Aeros pace Simula t ion and Systems Test Center A S T F Ai r s pace System Task Force
A S U Avion ics Swi tch i ng Un i t
A S S V A l tern a te So u rce Se lect ion Va lve A S TA Ai rport Surface Traffic Au tom a t ion A P U C Auxi l ia ry Power Unit Con trol ler
AQ F Avion ics Qualific a t ion Fac i l i ty AQ P ( 1 ) Adva nced Qualific a t ion Progra m
( 2 ) Avion ics Qualific a t ion Procedu re A-Q P S K Aeron au t ical Quadra t u re Phase Shift Keyi ng
AQ S Adva nced Quality Syste m
A R AC Avia t ion Rule m aki ng Advi sory Com m i t tee A R B Ar bi tra ry Waveform Ge n era tor
A R F Ai rline Risk Factor
A R I N C Aeron au t ical Radio, INC orpora ted
ARINC 429-13Mark 33 Digi tal Inform a t ion Tra n sfer System (DITS ), S u p ple ment 13
ARINC 629-2 Mul t i - Tester Da ta Bus: Pa rt 1 - Tech n ical Desc ri p t ion A R M C Area Regional Ma i n te n a nce Center
A R P ( 1 ) Aeron au t ical Rec om me n d ed Pract ice ( 2 ) Air Da ta Refere nce Pa n e l
A R PA Adva nced Resea rch Projects Age nc y
A R R Arriva l
A R S Au tom a ted Radar Sum m a ry ch a rt .T h ese are hourly ge n era ted ch a rts showi ng loc a t ion and inte n s i ty of radar ech oes.
A R S R Air Ro u te Surve i l la nce Radar A R T Au tom a t ic Reserve T h rust
A R TC C Ai r- Ro u te Traffic Con trol Center. A p proxi m a te ly 20 ce n ters cover the air traffic ro u tes in the Un i ted Sta tes us i ng numero us radars and ra dio com mun ic a t ion se ts.
A R T S Au tom a ted Terminal Radar Syste m A S A ( 1 ) Ai rc raft Se pa ra t ion Ass u ra nce
( 2 ) Au toland Sta t us An nunc ia tor (AF DS ) A S A A ACA RS System Access A p proval (AEEC ) A S A S Ai rc raft Se pa ra t ion Ass u ra nce System (AEEC )
1 0
AT S G F Air Traffic Services Geogra p h ic Fi l ter AT S M Air Traffic Services Message Processor AT S U Air Traffic Services Un i t
AT T At t i t u d e
AU X Auxi l ia ry
AV I O N I C S Avia t ion Electron ic s
AV L A N Avion ics Local Area Ne twor k AV L C Avia t ion VHF Link Con trol AV M Ai r borne Vi bra t ion Mon i tor
AVO L Aerodrome Vi s i bi l i ty Opera t ional Leve l AV PAC Avia t ion Packet Com mun ic a t ion AWAC S Ai r borne Wa rn i ng And Con trol Syste m AWA S Au tom a ted Wea th er Advi sory Sta t ion
AW G American Wi re Gauge
AW I N Avia t ion Wea th er Inform a t ion
AW I P S Adva nced Wea th er In teract ive Process i ng Syste m
AW M Au dio Wa rn i ng Mixer
AW O All Wea th er Opera t ion s AW O P All Wea th er Opera t ions Pa n e l
AW O S Au tom a ted Wea th er Observa t ion Syste m . A syste m that ga th ers surface wea th er inform a t ion and tra n s m i ts the inform a t ion to the pi lot via VOR, C omm Freq or te le p h one lines.
B a n d w i d t h The di ffere nce be tween the hig h est and lowest freque ncy com pon e n ts of a sign a l .
B A P Ba nk Ang le Pro tect ion B A R O Ba rome tric
B a r o-C o r r e c t e dP ress u re altitude-corrected local ba rome tric press u re.
A l t i t u d e
B ATA P Type B A p pl ic a t ion to A p pl ic a t ion Pro toc ol
AT ( 1 ) Air Traffic
( 2 ) Air Tra n s port A / T Au to th ro t tle
ATA ( 1 ) Actual Ti me of Arriva l ( 2 ) Air Tra n s port Assoc ia t ion
ATC Air Traffic Con trol
ATC A Air Traffic Con trol Assoc ia t ion ATC C Air Traffic Con trol Center
ATCR B S Air Traffic Con trol Radar Beac on Syste m ATC S S Air Traffic Con trol Sign a l i ng Syste m . A system to
provide inform a t ion be tween the pi lot and air traffic c on trol us i ng the VHF com mun ic a t ions tra n sce iver in con j unct ion wi th data link equi pme n t .
AT E Au tom a t ic Test Equi pme n t AT F M Air Traffic Flow Ma n age me n t AT H R Au to th rust Syste m
AT H S Au tom a t ic Ta rget Ha n d off Syste m AT I In strument Size Unit of Mea s u re AT I S ( 1 ) Air Traffic Inform a t ion Service
( 2 ) Au tom a t ic Terminal Inform a t ion Service ( 3 ) Au tom a t ic Terminal Inform a t ion Syste m AT L A S Ab brevia ted Test Langu age for Avion ics Syste m s AT M ( 1 ) Air Traffic Ma n age me n t
( 2 ) Asynch ron o us Tra n sfer Mod e
AT N Aeron au t ical Te lec om mun ic a t ions Ne twor k AT N P Aeron au t ical Te lec om mun ic a t ion Ne twork Pa n e l AT P Acce p ta nce Test Procedu re (Air Tra n s port ) AT R Air Tra n s port Racki ng
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 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 . A c 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
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 subse- que 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 ta xi ways wi thout re l ia nce on external visual refere nce.
C AT EVS C lear Air Tu r b ule nce Enh a nced Vi s ion Syste m C- B A N D The freque ncy ra nge be tween 4,000 and 8,000 MHz.
C B T C om p u ter- Ba sed Tra i n i ng
C C C - C h eck
B T M U Brake Te m pera t u re Mon i tor Un i t
B WA N Backup WA N
B y t e A gro u pi ng of eight bi ts.
C & C C ommand and Con trol C & W C on trol and Wa rn i ng
CA A C ivil Avia t ion Au th ori ty. A regula tory age ncy in th e Un i ted Ki ngd om .
C A AC C ivil Avia t ion Adm i n i stra t ion of China CAC C au t ion Advi sory Com p u ter
C /A Code ( 1 ) C o u r se Acqui s i t ion Cod e ( 2 ) G PS Course Acqui s i t ion Cod e C AC P C a bin Area Con trol Pa n e l
CA D C om p u ter Aid ed Des ign
C A DAG C om mun ic a t ions Au tom a t ion and Da ta Link CA E C om ponent A p pl ic a t ion Engi n eer
CAG E C om merc ial Avion ics GPS Engi n e C A H C a bin At tendant Ha n dse ts CA I C au t ion An nunc ia tor In dic a tor
C a l i b r a t e d C orrected for instrument errors and errors due to A i r s p e e d pos i t ion or loc a t ion of the press u re so u rce. At
sta n d a rd sea level con di t ion s, CAS is equal to true a i r s peed (TA S ).
CA L S E L A va ria t ion of the SE LCA L system in wh ich th e SE LCA L s ignal is com bi n ed wi th a spec ial ga t i ng ton e to produce an au tom a t ic funct ion by the rece iver. T h i s system is only a pro posal and not yet imple me n ted.
CAL VER C a l i bra t ion Veri fic a t ion
CA M C om p u ter Aid ed Ma nu fact u ri ng CA P T C a p ta i n
Ca r r i e r An ac signal that can be modula ted by ch a ngi ng th e a m pl i t u d e, freque ncy or pul se of the sign a l .
CA S ( 1 ) C ol l i s ion Avoid a nce Syste m ( 2 ) C om p u ted Ai r s peed
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C E U C h eckl i st En try Un i t
C F C h a nge Fie ld
CF D I U C e n tral Fault Display In terface Un i t CF D S C e n tra l ized Fault Display Syste m C F I T C on trol led Fl ight In to Terra i n c f m C u bic Feet per Minu te
C F M U C e n tral Flow Ma n age ment Un i t C F S C a bin Fi le Server
C G C e n ter of Gravi ty
CH G ( 1 ) C h a nge
( 2 ) C h a rge
C H I C om p u ter Human In terface C H I S C e n ter Hydraul ic Isola t ion Syste m CH O L C ollins High Ord er Langu age CI ( 1 ) C a bin In terp h on e
( 2 ) C onfigu ra t ion Ite m C I D C a tegory In teract ion Diagra m
CI D I N C om m on ICAO Da ta In terch a nge Ne twor k CI D S C a bin In terp h one Distri b u t ion Syste m CI E C om m i ss ion In tern a t ion a le de I Ecla i rage C I S C orpora te Inform a t ion Syste m
CLB C l i m b
CLK C lock
C L N P C on n ect ionless Ne twork Pro toc ol C L N S C on n ect ionless Ne twork Service
Cl o u d Wa ter or ice pa rt ic les havi ng ra dii smaller th a n D r o p l e t s 0.01 c m
CLR C lea r
C LT P C on n ect ionless Mode Tra n s port Pro toc ol C C B ( 1 ) C onfigu ra t ion Con trol Boa rd
( 2 ) C onverter Circuit Breaker C C D ( 1 ) C h a rged Coupled Device
( 2 ) C u r sor Con trol Device
C C I R In tern a t ional Radio Con s ul ta t ive Com m i t tee C C I T T C on s ul ta t ive Com m i t tee In tern a t ional Te le p h on e
and Te legra p h
C C M S C on tent Com pi la t ion Ma n age ment Syste m C C S C a bin Com mun ic a t ion Syste m
C C U C on trol and Com pe n sa t ion Un i t C C W C o un terc lockwi se
CD ( 1 ) C a rrier De tect
( 2 ) C h rom i n a nce Differe nce ( 3 ) C om pact Disc
C DA C oordi n a t i ng Des ign Au th ori ty C D B R C a bin Da ta Bus Re pea ter
C D G C onfigu ra t ion Da ta ba se Ge n era tor CDI C o u r se Devia t ion In dic a tor CDL C a bin Disc re pa ncy Log C D M C ol la bora t ive Dec i s ion Maki ng C D M S C ol la bora t ive Dec i s ion Maki ng Syste m CDP C on t i nu o us Da ta Progra m
CDR C ri t ical Des ign Review
CD- R O M C om pact Disc Rea d - O nly Me m ory C D S ( 1 ) C a bin Distri b u t ion Syste m
( 2 ) C om m on Display Syste m C D T I C ock pit Display of Traffic Inform a t ion CD U C on trol Display Un i t
C E P T C onfere nce Europèene des Postes et Te l è c om mun ic a t ion s
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C o m p a s s A low - powered ra dio beac on , used in con j unct ion L o c a t o r wi th ILS. A c om pa ss loc a tor has a two - le t ter
id e n t i fic a t ion and a ra nge of at lea st 15 miles.
CO M P C om pressor
CO N C on t i nu o us
Cone of An inverted con ical shaped area exte n di ng vert ic a l ly C o n f u s i o n a bove a VOR gro und fac i l i ty that is void of th e
bea ri ng sign a l .
CO N O P S C oncept of Opera t ion s
C o n s o l a n A low - freque nc y, keyed, C W, s h ort ba seline syste m us i ng two antennas to ra dia te a daisy - s h a ped pa t tern for naviga t ional aid purposes. The freque ncy ra nge is in the 300 kHz region . It is in limited use tod ay.
C o n t o u r C on tour or iso - c on tour refers to a wea th er ra d a r di s play prese n ta t ion that bla nks the echo re t u rns in the ce n ter of a storm ce l l . The area bla nked out is c a l led con tour and corres pon ds to the re t u rn leve l s that exceed a pred e term i n ed th res h old.
C O N U S C on t i n e n tal Un i ted Sta tes C O P C h a racter- O rie n ted Pro toc ol CO ROUTE C om pa ny Ro u te
C o r r e c t i o n A c orrect ion is appl ied to sta t ic so u rce press u re ( S S E C ) mea s u re me n ts to pa rtly or com ple te ly correct for
press u re errors that are caused by airflow ch a nges. It is c om p u ted as a funct ion of Mach and altitude ba sed on mea s u red errors for a pa rt icular sta t ic syste m .
Corrective A resol u t ion advi sory that instructs the pi lot to A d v i s o r y d evia te from cu rrent vert ical ra te (e. g. DON’ T C LIMB
when the airc raft is climbi ng ). ( TCA S ) C OT P C on n ect ion Orie n ted Tra n s port Pro toc ol C OT S C om merc ial Off - T h e - S h e l f
C P ( 1 ) C i rcular Pola riz a t ion ( 2 ) C onfl ict Pro be ( 3 ) C on trol Pa n e l C PA C losest Point of A p proach C M C on text Ma n age me n t
CM A C e n tral Ma i n te n a nce A p pl ic a t ion CMC C e n tral Ma i n te n a nce Com p u ter
CMCF C e n tral Ma i n te n a nce Com p u ter Funct ion CMCS C e n tral Ma i n te n a nce Com p u ter Syste m
CMD C om m a n d
C M F C om m on Message Form a t
CMM ( 1 ) C om m on Mode Mon i tor. A type of mon i tor c om m on to au tom a t ic fl ight con trol syste m s.
( 2 ) C om ponent Ma i n te n a nce Ma nu a l CMN C on trol Mo t ion Noi se
C M P C onfigu ra t ion Ma n age ment Pla n
CMS C a bin Ma n age ment Syste m
C M O S C om ple me n ta ry Me tal Oxide Se m ic on ductor CM U C om mun ic a t ions Ma n age ment Un i t
C N D B C ustom ized Naviga t ion Da ta ba se CN E S C e n tre national d’ e t u d es spa t ia les C/N O C a rrier- to - Noi se De n s i ty Ratio C N P C om m / Nav / P ul se
CN S C om mun ic a t ion , Naviga t ion , S u rve i l la nce
CN S / AT M C om mun ic a t ion , Naviga t ion , S u rve i l la nce / Air Traffic Ma n age me n t
C o a s t e d A track that is con t i nued ba sed on previo us track Tr a c k ch a racteri st ics in the abse nce of surve i l la nce data
re ports (TCA S ).
CO D E C C od er / Dec od er
C O M C ock pit Opera t i ng Ma nu a l
C O M / M E T / O P SC om mun ic a t ion s / Me teorologic a l / O pera t ion s CO M M C om mun ic a t ion s
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C S C om m on Service
CS C C a rgo System Con trol ler
C S C I C om p u ter Softwa re Configu ra t ion Ite m CSCP C a bin System Con trol Pa n e l
CS D B C om merc ial Sta n d a rd Da ta Bus CS D S C a rgo Smoke De tector Syste m CS E U C on trol Systems Electron ics Un i t C S F C om m a n d / S ta t us Fra me C S M A C a rrier Se n se Mul t i ple Access
C S M A / C D C a rrier Se n se Mul t i ple Access wi th Col l i s ion CS M M C rash Surviva ble Me m ory Modules
CS M U C a bin System Ma n age ment Un i t
C/S O I T C om mun ic a t ion s /S u rve i l la nce Opera t ion a l Im ple me n ta t ion Tea m
CS U C onfigu ra t ion Stra p pi ng Un i t C TA ( 1 ) C on trol Area (ICAO Term )
( 2 ) C on trol led Ti me of Arriva l C TA F C om m on Traffic Advi sory Freque nc y CTA I C owl T h ermal An t i - Ic i ng
CTA S C e n ter Trac on Au tom a t ion Syste m C TC C a bin Te m pera t u re Con trol ler
CT L C on trol
CT M O C e n tra l ized Air Traffic Flow Ma n age me n t O rga n iz a t ion
CTO L C onve n t ional Take Off and Landi ng C T R ( 1 ) C e n ter
( 2 ) C on trol zon e
CT R D C onfigu ra t ion Test Requi re me n ts Docume n t C T R L C on trol
CP C ( 1 ) C a bin Press u re Con trol ler ( 2 ) C on trol ler Pilot Com mun ic a t ion ( 3 ) C u r sor Pos i t ion Con trol
CPCI C om p u ter Program Configu ra t ion Ite m . A CPCI num ber id e n t i fies the configu ra t ion of a com p u ter softwa re progra m .
C P C S C a bin Press u re Con trol Syste m
C P D L C C on trol ler- P i lot Da ta Link Com mun ic a t ion s CP E C i rcular Pos i t ion Error
CP M C ore Processor Module
CPN C ollins Pa rt Num ber
CP R S R C om pressor
CP S C a bin Press u re Se n sor CP U C e n tral Process i ng Un i t C / R C om m a n d / Res pon se
CR ( 1 ) C h a nge Request
( 2 ) C on tra st Ratio
CR C ( 1 ) Cyc l ic Redun d a ncy Checki ng ( 2 ) Cyc l ic Redun d a ncy Cod e CR E S C orros ion Res i stant Stee l C R D C u rrent Ro u t i ng Dom a i n
C R DA C oo pera t ive Resea rch and Deve lo pment Agree me n t C R M ( 1 ) C ock pit Reso u rce Ma n age me n t
( 2 ) C ol l i s ion Risk Mod e l
( 3 ) C rew Reso u rce Ma n age me n t CR PA C on trol led Rece p t ion Pa t tern An te n n a C R R C u tover Rea di n ess Review
CR S C o u r se
CR T C a th ode Ray Tu be
C R U C om p u ter Rece iver Un i t
CR Z C rui se
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DA S Des ign a ted A l tera t ion Sta t ion
Data Link A system that allows exch a nge of digi tal data over an RF link. ATC SS is a data link system used by the air traffic con trol syste m . ACA RS is a data link syste m used by airline com m a n d, c on trol and manage me n t syste m , us i ng VHF com mun ic a t ion freque nc ies.
D-AT I S D igi tal Au tom a t ic Terminal Inform a t ion Syste m
D B Da ta ba se
d B Dec i be l
d B A Dec i bels Ad j usted
D B i ( 1 ) Dec i bels above iso to pic circula r
( 2 ) Dec i bels refere nced to an iso to pic ante n n a D B I Downl i nk Block Id e n t i fier
d B m Dec i bel(s) be low 1 m i l l i wa t t D B M X Da ta ba se Ma n age ment Syste m D B S D i rect Broa d c a st Sa te l l i te D B w Dec i bels refere nced to 1 wa t t d B W Dec i be l -Wa t ts
D B U Da ta ba se Un i t
D C D i rect Curre n t
D C A S D igi tal Con trol Au dio Syste m
D C D Do u ble Channel Duplex . A c om mun ic a t ion system us i ng two RF ch a n n e l s, one channel for rece ive and one channel for transmit opera t ion s, for simul ta n eo us c om mun ic a t ion .
D C E Da ta Com mun ic a t ions Equi pme n t D C G F Da ta Conver s ion Ga teway Funct ion
D C M F Da ta Com mun ic a t ion Ma n age ment Funct ion D C M S Da ta Com mun ic a t ion Ma n age ment Syste m D C N ( 1 ) Des ign Change No t ice
( 2 ) Document Change No t ice ( 3 ) D rawi ng Change No t ice
CT S C lear To Se n d
CT U C a bin Te lec om mun ic a t ions Un i t C U ( 1 ) Channel Utiliz a t ion
( 2 ) C om bi n er Unit (HUD) ( 3 ) C on trol Un i t
C / U T C od e / Unit Test
C V / D F D R C ock pit Voice and Digi tal Fl ight Da ta Rec ord er
CVR C ock pit Voice Rec ord er
CVR C P C ock pit Voice Rec ord er Con trol Pa n e l
CW ( 1 ) C lockwi se (cw)
( 2 ) C on t i nu o us Wave. A c on t i nu o us train of id e n t ical osc i l la t ion s.
C W C C om pa ra tor Wa rn i ng Com p u ter CW I C on t i nu o us Wave In terfere nce CW P ( 1 ) C on trol led Wor ki ng Pos i t ion
( 2 ) C on trol ler Wor ki ng Pos i t ion CW S C on trol W h eel Steeri ng
D 8 P S K D i ffere n t ial Eight Phase Shift Keyi ng D & O Desc ri p t ion and Opera t ion
DA ( 1 ) Descent Advi sor
( 2 ) D ri ft Ang le D / A D igi ta l - to - An a log
DA B S D i sc re te Ad dressa ble Beac on Syste m DA D C D igi tal Air Da ta Com p u ter
DA D S D igi tal Air Da ta Syste m DA P D igi tal Service Access Product
DA R C D i rect Access Radar Channel. An independent back u p to main ATC com p u ter s.
DA R PA Defe n se Adva nced Resea rch Projects Age nc y DA R P S D yn a m ic Ai rc raft Ro u te Pla n n i ng Study
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D e m a n d An ACA RS mode of opera t ion in wh ich
M o d e c om mun ic a t ions may be initia ted by the gro un d processor or the airborne syste m .
D E P De pa rt u re
D E R Des ign a ted Engi n eeri ng Re prese n ta t ive
D E S Desce n t
D E S C R Desc ri p t ion
D e s e n s i t i z a t i o nTCAS se n s i t ivi ty level (th reat vol ume) reduct ion D E S T Dest i n a t ion
D E V Devia t ion
D FA D i rect ion Fi n di ng An te n n a DFCS D igi tal Fl ight Con trol Syste m
D F DA F D igi tal Fl ight Da ta Acqui s i t ion Funct ion
D F DA M U D igi tal Fl ight Da ta Acqui s i t ion Ma n age ment Un i t D F DAU D igi tal Fl ight Da ta Acqui s i t ion Un i t . The DF DAU sa m ples, c on di t ions and digi t izes the fl ight data . DFDR D igi tal Fl ight Da ta Rec ord er
D F D U D igi tal Fl ight Da ta Un i t
DFI D U Dual Funct ion In teract ive Display Un i t DFI U D igi tal Fl ight In strument Un i t
D F S D igi tal Freque ncy Se lect D F U D igi tal Funct ion Un i t
D G D i rect ional Gyro
D G N S S D i ffere n t ial Glo bal Naviga t ion Sa te l l i te Syste m D G P S D i ffere n t ial Glo bal Pos i t ion i ng Syste m D H ( 1 ) Da taflash Hea d er
( 2 ) Dec i s ion He ig h t
D I Da ta In terru p t
D I AG S D iagra m s
D I D Da ta Item Desc ri p t ion D C P D i s play Con trol Pa n e l
D C S Do u ble Channel Simplex . A c om mun ic a t ion syste m us i ng two RF channels for non - s i mul ta n eo us c om mun ic a t ion . One channel is di sa bled wh i le the o th er channel is used to tra n s m i t .
D C U Da ta Conce n tra tor Un i t D C V D i rect ional Con trol Va lve
D D Da ta De l ivery
D DA ( 1 ) D igi tal Differe n t ial An a lyzer ( 2 ) D i sta nce Da ta Ad a p ter
D D D Dual Disk Drive
D D I D i rect Dial In dic a tor
D D M D i ffere nce in De p th of Modula t ion
D D P Dec la ra t ions of Des ign and Perform a nce. A c on trol d ocument requi red by the Un i ted Ki ngd om Civi l Avia t ion Au th ori ty (CAA) for cert i fic a t ion of avion ic s equi pme n t .
D D R D raft Document Review
D D S D i rect Digi tal Syn th es izer D D T Downl i nk Da ta Tra n sfer
D D TC Da ta Link De l ivery of Expected Ta xi Clea ra nces D E C C A A n aviga t ion system wid e ly used by shippi ng in E u ro pe. The gro und fac i l i t ies con s i st of a master sta t ion and several slave sta t ion s.
D e c i m a l Ba se -10 coun t i ng syste m . N um bers include 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
d e d Dedic a ted
D E F DA R S D igi tal Expa n d a ble Fl ight Da ta Acqui s i t ion and Rec ordi ng Syste m
D E F L Deflect ion
D E G Degree
D E L De le te
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D L U Download Un i t
D M D i sc on n ected Mod e
D M A D i rect Me m ory Access
D M E D i sta nce Mea s u ri ng Equi pme n t . A system th a t provid es di sta nce inform a t ion from a gro und sta t ion to an airc raft .
D M E / N Ab brevia t ion for a DME normal syste m D M E / P Ab brevia t ion for a DME prec i s ion syste m
D M I R Des ign a ted Ma nu fact u ri ng In s pect ion Re prese n ta t ive D M M ( 1 ) Da ta Me m ory Module
( 2 ) D igi tal Mul t i me ter D M N Da ta Mul t i plexi ng Ne twor k D M S De bris Mon i tori ng Se n sor D M U Da ta Ma n age ment Un i t
D O- 1 6 0 RTCA Document 160, Envi ronme n tal Con di t ions and Test Procedu res for Ai r borne Equi pme n t , Iss ued 12 / 04 / 89
D O- 1 7 8 RTCA d ocument 178, Softwa re Con s id era t ions in Ai r borne Systems and Equi pment Cert i fic a t ion , Iss ued 03 / 22 / 85
D O C Docume n ta t ion D O D De pa rtment of Defe n se
D O O R S D yn a m ic Object Orie n ta ted Requi re me n ts Syste m Doppler The ch a nge in freque ncy observed at the rece iver E f f e c t when the tra n s m i t ter and rece iver are in motion
re la t ive to each oth er.
D O S Disk Opera t i ng Syste m D OT De pa rtment of Tra n s porta t ion D OT S D yn a m ic Ocean Tracki ng Syste m
D o w n l i n k The ra dio tra n s m i ss ion pa th downwa rd from th e a i rc raft to the ea rth .
d p i d o ts per inch D I P ( 1 ) Da ta In terrupt Progra m
( 2 ) Dual In-line Pack age. The most com m on pack age configu ra t ion for integra ted circui ts.
D I R D i rector
D i r e c t e d A DME opera t i ng mode that allows an FMCS to M o d e se lect one to five DME sta t ions for interroga t ion . D I R / I N TC D i rect In terce p t
D I S C D i sc on n ect D I S C H D i sch a rge D I S C R D i sc re pa nc y D I S T D i sta nce
D I T S Da ta Inform a t ion Tra n sfer Syste m
D L ( 1 ) Da ta Link
( 2 ) Downl i nk
D L A P Da ta Link A p pl ic a t ion Processor D L C Da ta Link Con trol Display Un i t D L C I Da ta Link Con trol Id e n t i fier D L E Da ta Link En t i ty
D L G F Da ta Load Ga teway Funct ion D L I Da ta Link In terpre ter progra m
D L K Da ta Link (AEEC )
D L L Da ta Link Libra ry
D L M Da ta Link Ma n age ment Un i t D L M E Da ta Link and Message Engi n eeri ng D L / M S U Da ta Loa d er / Ma ss Storage Un i t D LO D S D uct Leak and Overh eat De tect ion
DLP Da ta Link Processor
D L S Da ta Load Syste m
D LT D igi tal Lineal Ta pe - used for the storage of vid eo and au dio fi les
3 1
D T M F Dual Tone Mul t i - Freque nc y D T M De m on stra t ion Test Mileston e D T P D U Da ta Pro toc ol Da ta Un i t D T U Da ta Tra n sfer Un i t
D U D i s play Un i t
Dual Mode An airborne DME RT c a pa ble of process i ng DME / N D M E and DME/P gro und sta t ion sign a l s. O pera t ion is in
the L-band freque ncy ra nge.
D UAT D i rect User Access Term i n a l
D u p l ex A c om mun ic a t ion opera t ion that uses th e s i mul ta n eo us opera t ion of the transmit and rece ive equi pment at two loc a t ion s.
DV F De m on stra t ion and Va l id a t ion Fac i l i ty DV M D igi tal Vol tme ter
DWA N D i rect WA N
D X D i sta nce
D y n a m i c D yn a m ic Press u re is the di ffere nce be tween pi tot and P r e s s u r e sta t ic press u re.
D y n a m i c RAM con structed of capac i tor ele me n ts. Me m ory R A M cells must be periodic a l ly refres h ed to keep capac i tor s
from di sch a rgi ng and los i ng data . ( See “S ta t ic RA M” )
E E a st
E A A E xperi me n tal Ai rc raft Assoc ia t ion E A D I Electron ic Attitude Director In dic a tor E A I Engine An t i - Ice
E A P Engine A lert Processor E A R O M Electric a l ly A l tera ble ROM
E A R T S En ro u te Au tom a ted Radar Tracki ng Syste m E A S E quiva lent Ai r s peed
E A S I E Enh a nced ATM and Mode S Im ple me n ta t ion in Euro pe
D P R Dual Port RA M
D P S K D i ffere n t ial Phase Shift Keyi ng D R ( 1 ) Da ta Rec on i ng
( 2 ) Da ta Rece p tac le
D R E R Des ign a ted Radio Engi n eeri ng Re prese n ta t ive (FA A ) Drift Angle The ang le be tween hea di ng and track. It is due to
the effect of wind cu rre n ts. Some t i mes called the c rab ang le.
D R N Document Re lea se No t ice D S A D D igi tal Service Access Device
D S A R C Defe n se System Acqui s i t ion Review Cyc le D S B Do u ble Side Ba n d. An AM signal wi th the carrier
re m oved. Requi res the sa me ba n dwidth as the AM sign a l .
D S D U Da ta Signal Display Un i t D S F D i s play System Funct ion D S P ( 1 ) D igi tal Signal Processor
( 2 ) D i s play Se lect Pa n e l ( 3 ) Domain Spec i fic Pa rt D S P D R V D i s play Driver
D S P Y D i s play (annunc ia t ion on CDU ) D S R D i s play System Re place me n t D S S Dec i s ion Support Syste m s
D S S S D i rect Seque nce Spread Spectrum D S U ( 1 ) Da ta Sign a l i ng Un i t
( 2 ) Domain Service Un i t D T D ( 1 ) Da ta Terminal Display
( 2 ) Document Type Defi n i t ion D T E Da ta Terminal Equi pme n t DT & E Deve lo pment Test and Eva l u a t ion D T G D i sta nce - to - go
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E D D S Electron ic Document Distri b u t ion Service E D I Engine Da ta In terface
E D I F Engine Da ta In terface Funct ion E D I U Engine Da ta In terface Un i t
E D M S Electron ic Da ta Ma n age ment System E D P ( 1 ) Electron ic Da ta Process i ng
( 2 ) Engine Driven Pum p
( 3 ) Engi n eeri ng Deve lo pment Pa l le t E D U Electron ic Display Un i t
E E Electron ics Equi pment (e. g. E E- Bay ) E E C Electron ic Engine Con trol
E E P R O M Electrical Era sa ble Progra m m a ble Read Only Me m ory E E U E LMS Electron ics Un i t
E F C E xpected Fu rth er Clea ra nce E F D Electron ic Fl ight Display E F D R E xpa n d ed Fl ight Da ta Rec ord er E F I C Electron ic Fl ight In strument Con trol ler E F I P Electron ic Fl ight In strument Processor EFI S Electron ic Fl ight In strument Syste m EFIS CP E FIS C on trol Pa n e l
E G I H O E xpedi ted Gro und In i t ia ted Ha n d off E E LV Evolved Expe n d a ble Launch Ve h ic le E G N O S E u ro pean Geosta t ion a ry Overlay Syste m E G P E xterior Ga teway Pro toc ol
E G P W S Enh a nced Gro und Proxi m i ty Wa rn i ng Syste m E GT E x h aust Gas Te m pera t u re
E H S I Electron ic Horizon tal Situation In dic a tor E H V Electro - Hydraul ic Va lve
E ATC H I P E u ro pean Air Traffic Con trol Ha rm on iz a t ion and In tegra t ion Progra m me
E AT M S E u ro pean Air Traffic Ma n age ment Syste m s E B AC E E u ro pean Bus i n ess Avia t ion Conve n t ion and
E x h i bi t ion
E C Event Cri terion
E C AC E u ro pean Civil Avia t ion Confere nce E C A M Electron ic Cau t ion A lert Module E C A R S Enh a nced ACA RS
E C E F E a rth - C e n tered, E a rth - Fi xed
E c h o The port ion of the ra dia ted energy reflected back to the antenna from the ta rget (WXR).
E C M Electron ic Con trol Module
E C M P Electron ic Com ponent Ma n age ment Syste m E C O N E c on omy (minimum cost speed sch edule ) E C P E ICAS Con trol Pa n e l
E C S ( 1 ) Engi n eeri ng Com pi ler Syste m . An au tom a ted d a ta storage syste m .
( 2 ) Envi ronme n tal Con trol Syste m ( 3 ) Event Cri terion Subfie ld
E C S L Left Envi ronme n tal Con trol System Card E C S M C EC S M i sce l la n eo us Card
E C S R Right Envi ronme n tal Con trol System Card E C U ( 1 ) E ICAS Con trol Un i t
( 2 ) Electron ic Con trol Un i t ( 3 ) E xternal Com pe n sa t ion Un i t
E D E ICA SD i s play
E / D En d - of - Desce n t
E DA Electron ic Des ign Au tom a t ion E DAC E rror De tect ion and Correct ion
( used interch a ngea bly wi th EDC ) E D C E rror De tect ion and Correct ion
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E O M End Of Message
E OT End Of Text
E P E xternal Power
E P C E xternal Power Con tactor
E P C S Engine Pro p ul s ion Con trol Syste m E- P I R E P S Electron ic Pilot Re ports
E- P l a n e The E- Plane is the plane of an antenna that con ta i n s the electric fie ld.The pri nc i pal E- Plane also con ta i n s the di rect ion of maxi mum ra dia t ion .
E P L D Electric a l ly Progra m m a ble Logic Device E P P Enh a nced Pa ra l lel Port
E P R Engine Press u re Ratio E P R O M E ra sa ble Progra m m a ble ROM E P S Electrical Power Syste m E Q U I P E qui pme n t
E q u i v a l e n t E quiva lent Ai r s peed is a di rect mea s u re of th e Airspeed i nc om press i ble freestream of dyn a m ic press u re.
( E A S ) It is CAS corrected for com press i bi l i ty effects.
ER PDU E cho Re ply Pro toc ol Da ta Un i t
E R A E u ro pean Regional Ai rl i n es Assoc ia t ion E R B Engi n eeri ng Review Boa rd
E R D End Ro u t i ng Dom a i n
E R D I En Ro u te Domain Infra struct u re E R E E xternal Roll Extrus ion
E R P Eye Refere nce Poi n t
ERP PDU E cho Re ply Pro toc ol Da ta Un i t ERQ PDU E cho Request Pro toc ol Da ta Un i t E R U Engine Re lay Un i t
E S End Syste m
E I A Electron ic In dustries Assoc ia t ion E I C A S Engine In dic a t ion and Crew A lert Syste m
E I C A S C Engine In dic a t ion and Crew A lert System Con trol s E I P I E xte n d ed In i t ial Pro toc ol Id e n t i fier
E I R P E a rth Inc ident Radia ted Power E I S ( 1 ) Electron ic In strument Syste m
( 2 ) Engine In dic a t ion Syste m
E I S A E xte n d ed In dustry Sta n d a rd Arch i tect u re E I U E FIS / E ICAS In terface Un i t
E L / F C G Electron ic Log book and Fault Correct ion Guid e E L B / I S E Electron ic Log book In - Service Eva l u a t ion E L C E m i t ter Coupled Logic
E L E C Electric a l
E L M E xte n d ed Le ng th Message
E L M S Electrical Load Ma n age ment Syste m
ELS Electron ic Libra ry System
E LT E merge ncy Loc a tor Tra n s m i t ter
E M Ele ment Ma n ager
E M C ( 1 ) Electrom agn e t ic Com pa t i bi l i ty ( 2 ) En terta i nment Mul t i plexer Con trol ler E M E R E merge nc y
E M I Electro - Magn e t ic In terfere nce E M S ( 1 ) E merge ncy Medical Services
( 2 ) Engine Ma n age ment Syste m
E N G Engi n e
E N O C Engi n eeri ng Ne twor k O pera t ions Center
E N Q En qui re
E / O Engi n e - O u t
E O D End Of Day
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E U R E u ro pea n E U R AT N E u ro pean AT N E U R E T E u ro pean Tra n s port
E u r o c a e E u ro pean Orga n iz a t ion for Civil Avia t ion Electron ic s.
A regula tory age ncy for avion ics cert i fic a t ion in E u ro pe.
E U R O-C O N T R O L E u ro pean Orga n iz a t ion for the Safe ty of Ai r Naviga t ion Opera t ion s
E V E a rn ed Va l ue
E V M E rror Vector Magn i t u d e E V S Enh a nced Vi s ion Syste m E X E C E xecu t ive
F Fah re nh e i t
FA Final A p proach
FA A ( 1 ) Fed eral Avia t ion Adm i n i stra t ion (U. S.) ( 2 ) Fed eral Avia t ion Au th ori ty
FA ATC FA A Tech n ical Center (U. S.) FAC Fl ight Augme n ta t ion Com p u ter
FA D E C Full Au th ori ty Digi tal Electron ic Con trol
FA F Final A p proach Fi x
FA I Fi r st Art ic le In s pect ion
Fan Marke r A m a r ker beac on used to provide id e n t i fic a t ion of pos i t ions along airways. S ta n d a rd fan marker produces an elliptic a l - s h a ped pa t tern . A sec ond type produces a dum b be l l - s h a ped pa t tern . FA N S Fu t u re Air Naviga t ion Syste m
FA R ( 1 ) Fed eral Acqui s i t ion Regula t ion ( 2 ) Fed eral Avia t ion Regula t ion FA S T Final A p proach Spac i ng Tool
FAT Factory Acce p ta nce Test
F B L Fly - By - L ig h t E S A E u ro pean Space Age nc y
E S A S ( 1 ) Electron ic Situation Awa re n ess Syste m ( 2 ) Enh a nced Situational Awa re n ess Syste m E-S c a n Electron ic Sc a n n i ng
E S D Electrosta t ic Disch a rge
E S D S Electrosta t ic Se n s i t ive Devices. A l so kn own as ESSD.
E S H End System He l lo
E S I D Engine and System In dic a t ion Display E S I S Engine and System In dic a t ion Syste m E S R En ergy Storage / C on trol
E S S ( 1 ) Electron ic Swi tch i ng Syste m ( 2 ) Envi ronme n tal Stress Sc ree n i ng
E S S D Electro S ta t ic Se n s i t ive Devices. See also ESDS.
E S T E st i m a ted
E S U Envi ronme n tal Se n sor Un i t E TA E st i m a ted Ti me of Arriva l
E T B ( 1 ) End of Block (ASC I I / IA5 ch a racter ) ( 2 ) Engi n eeri ng Test Ba n d
E T D E st i m a ted Ti me of De pa rt u re E T I Ela psed Ti me In dic a tor E T M Ela psed Ti me Mea s u re me n t
E T M S Enh a nced Traffic Ma n age ment Syste m E TO P S E xte n d ed Twin Engine Opera t ion s E T P E qual Ti me Poi n t
E T R C E xpected Ta xi Ramp Clea ra nces E T V S Enh a nced Terminal Voice Swi tch E T X End of Tra n s m i ss ion
E UA F S Enh a nced Upper Air Forec a st Syste m E U P S E xternal Un i n terru p t i ble Power Supply
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F D R S Fl ight Da ta Rec ord er Syste m F D S Fl ight Display Syste m F D U Fl ux De tector Un i t
F E AT S Fu t u re Euro pean Air Traffic Ma n age ment Syste m F E C Forwa rd Error Correct ion
F E P Front End Processor
F F Fuel Flow
F G C Fl ight Guid a nce Com p u ter F H A Funct ional Haz a rd Assess me n t F H S S Freque ncy Ho p ped Spread Spectrum
F H W Fault History Word
F I B Forwa rdi ng Inform a t ion Ba se F I F O Fi r st In , Fi r st Out
F I M Fault Isola t ion Ma nu a l F I R Fl ight Inform a t ion Region F I S ( 1 ) Fl ight Inform a t ion Service
( 2 ) Fl ight Inform a t ion Syste m ( 3 ) Fl ight In strument Syste m
F I S- B Fl ight Inform a t ion Services - Broa d c a st
F I X Pos i t ion in space, us u a l ly on airc raft ’s fl ight pla n F L ( 1 ) Fl ight Level (as in FL 410 ). This term i n ology is
used to desc ri be airc raft attitude when th e a l t i me ter is set at QNE.
( 2 ) Foot Lambert F L C H Fl ight Level Change FLIR Forwa rd Loo ki ng Infra - Red F L M Fl ight Line Ma i n te n a nce
F LT Fl ig h t
F LTA Forwa rd Loo ki ng Terrain Avoid a nce F LT C T R L Fl ight Con trol
F B O Fi xed Ba se Opera tor F B W Fly - By -Wi re
F C Foot Candles
F C A Funct ional Configu ra t ion Au di t F C A F Fl ight Da ta Acqui s i t ion
F C C ( 1 ) Fed eral Com mun ic a t ions Com m i ss ion ( 2 ) Fl ight Con trol Com p u ter
F C D C Fl ight Cri t ical dc F C P ( 1 ) Fl ight Con trol Pa n e l
( 2 ) Fl ight Con trol Processor F C S ( 1 ) Fl ight Con trol Syste m
( 2 ) Fra me Check Seque nce
F D ( 1 ) Final Da ta
( 2 ) Fl ight Director ( 3 ) Fl ight Dyn a m ic s
F DA F Fl ight Da ta Acqui s i t ion Funct ion F DAU Fl ight Da ta Acqui s i t ion Un i t F D B Fl ight Plan Da ta Ba nk F D E Fl ight De tect ion Exc l us ion F D D I Fi ber Distri b u ted Da ta In terface F D E P Fl ight Da ta En try Pa n e l F D H Fl ight Deck Ha n dse t F D I Fault De tect ion and Isola t ion F D I O Fl ight Da ta Inp u t / O u tp u t
F D M Freque ncy Divi s ion Mul t i plex . A system wh ere th e messages are tra n s m i t ted over a com m on pa th by e m ployi ng a di fferent freque ncy band for each sign a l . F D M A Freque ncy Divi s ion Mul t i ple Access
F D P S Fl ight Da ta Process i ng Syste m F D R Fl ight Da ta Rec ord er
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F Q R Formal Qualific a t ion Review
FR From
F R A Flap Re tract ion A l t i t u d e F R A D Fra me Re lay Access Device
Framing A p ul se that is used to mark the begi n n i ng or end P u l s e of the cod ed re ply pul ses.
F R E E R Free - Ro u te Experi me n tal Enc o un ter Resol u t ion Free Scan A DME opera t i ng mode that will provide di sta nce M o d e d a ta to all DME gro und sta t ions wi thin the DME
ra nge (LOS ).
F R E Q Freque nc y
Frequency The abi l i ty of a rece iver- tra n s m i t ter to ra pidly and c on t i nu a l ly shift opera t i ng freque nc y.
F R M Fault Re port i ng Ma nu a l F R M R Fra me Re ject
F R P Fed eral Radion aviga t ion Pla n F R PA Fi xed Rece p t ion Pa t tern An te n n a
F R Q Freque nc y
F S A S Fl ight Service Au tom a t ion Syste m F S E Fie ld Service Engi n eer
F S E U Flap Slat Electron ics Un i t F S F Fl ight Safe ty Fo un d a t ion F S S Fl ight Service Sta t ion
F T Funct ional Test
F T E Fl ight Tech n ical Error F T P Fi le Tra n sfer Pro toc ol F T P P Fault Tolerant Power Pa n e l F W Fa i l u re Wa rn i ng
F W C Fl ight Wa rn i ng Com p u ter F LT I N S T Fl ight In strume n t
F LW Forwa rd Loo ki ng Wi n ds h ear Radar
F M Freque ncy Modula t ion
F M A Fl ight Mode An nunc ia tor F M C ( 1 ) Fl ight Director Con trol (FD)
( 2 ) Fl ight Ma n age ment Com p u ter (FMC S ) F M C F Fl ight Ma n age ment Com p u ter Funct ion F M C S Fl ight Ma n age ment Com p u ter Syste m F M C W Freque nc y - Modula ted Con t i nu o us Wave F M E A Fa i l u re Mode and Effects An a lys i s F M F Fl ight Ma n age ment Funct ion F M P Fl ight Mode Pa n e l
F M S Fl ight Ma n age ment Syste m F M U Fuel Me teri ng Un i t
F / O ( 1 ) Fi r st Officer ( 2 ) Fuel/Oil Cooler F O C ( 1 ) Fuel/Oil Cooler
( 2 ) Full Opera t ional Capa bi l i ty
F O G Fi ber Optic Gyro
F O Q A Fl ight Opera t ions Quality Ass u ra nce F PA ( 1 ) Fl ight Pa th Ang le
( 2 ) Focal Plane Array FPAC Fl ight Pa th Acce lera t ion FP C Fl ight Profi le Com pa ra tor FP G A Fie ld Progra m m a ble Ga te Array
FP M Feet Per Minu te
F P V Fl ight Pa th Vector
F Q I S Fuel Quantity In dic a t i ng Syste m F Q P U Fuel Quantity Processor Un i t
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G GT F M G ro un d - G ro und Traffic Flow Ma n age me n t G G R G ro un d - G ro und Ro u ter
G G S G lo bal Pos i t ion i ng System Gro und Sta t ion
G H G ro und Ha n dl i ng
G H z G igah ertz (bi l l ion hertz ) G I G roup Id e n t i fier
G I B GN SS In tegri ty Broa d c a st G I C GN SS In tegri ty Channel G I C B G ro un d - In i t ia ted Com m - B G I G O Ga r bage - In Ga r bage - O u t G I H O G ro und In i t ia ted Ha n d off
G L ( 1 ) G ro und Loc a t ion (ACA RS / AFE PS ) ( 2 ) G roup Le ng th
G l i d e p a t h The approach pa th used by an airc raft du ri ng an i n strument la n di ng or the port ion of the glid es lo pe that inter sects the loc a l izer. The glid e pa th does not provide guid a nce com ple te ly to a to uch d own point on the runway.
G l i d e s l o p e The vert ical guid a nce port ion of an ILS syste m . GLN S G PS Landi ng and Naviga t ion Syste m
GLN U G PS Landi ng and Naviga t ion Un i t G LO N A S S G lo bal Naviga t ion Sa te l l i te Syste m
GLS ( 1 ) G PS Landi ng Syste m
( 2 ) Gun Layi ng Syste m G L U G PS L a n di ng Un i t
G M Guid a nce Ma teria l
G M C G ro und Move ment Con trol
G M T G ree nwich Mean Ti me. GM T is a un iver sal time sc a le ba sed upon the mean ang le of ro ta t ion of th e ea rth about its axis in re la t ion to the sun . It is refere nced to the pri me meridian that pa sses th ro ug h G ree nwich , Eng la n d.
G M U G lo bal Ne twork Arch i tect u re
F W D Forwa rd
F W S Fl ight Wa rn i ng Syste m
F Y D S Fl ight Director / Yaw Da m per Syste m G A ( 1 ) Ge n eral Avia t ion
( 2 ) Go Aro un d G A A S Ga l i um Ar se n id e
G AC S Ge n e t ic ATN Com mun ic a t ions Service G A I T G ro un d - ba sed Augme n ta t ion and In tegri ty G A M A Ge n eral Avia t ion Ma nu fact u rers Assoc ia t ion G AT M G lo bal Air Traffic Ma n age me n t
G B S T G ro un d - Ba sed Softwa re Tool G b y t e G iga byte (bi l lon bytes )
G C A S G ro und Col l i s ion Avoid a nce Syste m G C B Ge n era tor Circuit Breaker
G C C G ro und Cluster Con trol ler (ACA RS ) G C S G ro und Clutter Suppress ion G C U Ge n era tor Con trol Un i t G DLP G ro und Da ta Link Processor
G D O P Geome tric Dilution Of Prec i s ion . A term referri ng to error introduced in a GPS calcula t ion due to th e pos i t ion i ng of the sa te l l i tes and the rece iver.
G D P G ro und De lay Progra m
G E N Ge n era tor
G E O Geosta t ion a ry Earth Orbi t G E S G ro und Earth Sta t ion
G F E Government Fu rn i s h ed Equi pme n t G F I Ge n eral Format Id e n t i fier
G F S K Gauss ian Freque ncy Shift Keyi ng G G ( 1 ) G ra p h ics Ge n era tor
( 2 ) G ro un d - G ro un d
4 2
Gray Code S pec ial bi n a ry code used to transmit altitude data be tween fra m i ng pul ses of a tra n s pon d er re ply. A c yc l ic code havi ng only one digit ch a nge at a time.
Used in Mode C to transmit airc raft ba rome tric a l t i t u d e. A l so kn own as Gilham cod e.
G r o u n d A ra dio wave that travels along the ea rth’s surface.
Wa v e
G R P Geogra p h ic Refere nce Poi n t G S ( 1 ) G l id es lo pe
( 2 ) G ro und Speed G / S G l id es lo pe
G S C G ro und Sta t ion Con trol ler (ACA RS ) G S E G ro und Support Equi pme n t G S I F G ro und Sta t ion Inform a t ion Fra me G S M G lo bal Systems Mo bi le
G S M S G ro und Sta t ion Ma n age ment Syste m G S P G la re Shie ld Pa n e l
G S V G ray Sc a le Vol tage ( s )
GT G rea ter T h a n
GTA Ge n eral Terms Agree me n t
GTC Da ta Link Gro und Terminal Com p u ter GT R Ge n eral Tech n ical Requi re me n ts G U I G ra p h ic / User In terface
G V E G ra p h ics Vector Engi n e
G W Ga teway
G W S G ra p h ical Wea th er Services
G y r o s c o p e A ro ta t i ng device that will maintain its original pla n e of ro ta t ion , no matter wh ich di rect ion the gyrosc o pe m o unt is turn ed.
H A D Ha rdwa re Arch i tect u re Docume n t H A M S Hot Air Ma n age ment Syste m
G N D G ro un d
G N E G ross Naviga t ional Error G N R G lo bal Naviga t ion Rece iver G N S S G lo bal Naviga t ion Sa te l l i te Syste m G N S S P G lo bal Naviga t ion Sa te l l i te System Pa n e l
G o n i o m e t e r A d evice that com bi n es the two signals from two loo p a n te n n a s. The gon iome ter (or resolver) con tains two fi xed coils and one ro ta t i ng coi l . The ro ta t i ng coil is c on n ected to the A DF bea ri ng indic a tor needle to i n dic a te the re la t ive bea ri ng from the airc raft to th e N DB sta t ion . The mech a n ical pos i t ion of the ro tor re prese n ts the bea ri ng of the sta t ion , and the pos i t ion is electric a l ly tra n s m i t ted to the RMI.
G O S G rade of Service
G O S I P Government Open Systems In terc on n ect ion Profi le G PA D I R S G lo bal Pos i t ion i ng, Air Da ta , In ert ial Refere nce Syste m G P I B Ge n eral Purpose In strument Bus
G P P Ge n eral Purpose Processor
G P S ( 1 ) G lo bal Pos i t ion i ng System (See NAVSTA R ) ( 2 ) G lo bal Pos i t ion i ng Sa te l l i te
GPS L1 G lo bal Pos i t ion i ng System L1 Freque nc y G P S S U G lo bal Pos i t ion i ng System Se n sor Un i t G P U G ro und Power Un i t
G P W C G ro und Proxi m i ty Wa rn i ng Com p u ter G P W S G ro und Proxi m i ty Wa rn i ng Syste m
G R G ro und Ro u ter
G R I B G rid d ed Bi n a ry (Na t ional Wea th er Service Mod e l O u tp u t )
G r a d i e n t The ra te at wh ich a va ria ble qu a n t i ty inc rea ses or dec rea ses.
4 7
H G C Head-Up Guid a nce Com p u ter H G S Head-Up Guid a nce Syste m H H L D Hea di ng Hold
H I H ig h
H I C Head Im pact Cri teria H I L Horizon tal In tegri ty Limit H I R F ( 1 ) H igh In te n s i ty Radia ted Fie ld
( 2 ) H igh In te n s i ty Radio Freque nc y H L C S H igh Lift Con trol Syste m
H L E H ig h er Layer En t i ty H L L H igh Level Langu age H M I Human Machine In terface
H M O S H igh De n s i ty Me tal Oxide Se m ic on ductor H M U He ight Mon i tori ng Un i t
H O Ha n d off
H O W Hand Over Word
H P ( 1 ) H igh Press u re
( 2 ) Holdi ng Pa t tern H PA H igh Power Am pl i fier
h Pa h ecto Pa sc a l
H P C H igh Press u re Com pressor
H - P l a n e The H-Plane is the plane in wh ich the magn e t ic fie ld of the antenna lies. The H-Plane is perpe n dicular to the E- Pla n e.
H P R H ig h - Power Re lay H P R E S P ress u re A l t i t u d e
H P S OV H ig h - P ress u re Shutoff Va lve H P T H ig h - P ress u re Tu r bi n e H R D Home Ro u t i ng Dom a i n H S A Horizon tal Sta bi l izer Act u a tor H A R S H igh Altitude Ro u te Syste m
HCP Head-Up Con trol Pa n e l
HCI Human Com p u ter In terface
H C S Host Com p u ter Syste m
H C W Heavi ly Cold Wor ked Pipe and Tu be (Sea n - Free ™ ) H D B K Ha n dboo k
H D G Hea di ng
HDG SEL Hea di ng Se lect H D I S K Ha rd Disk
H D L Hy brid Da ta Link
H D L C H ig h - Level Da ta Link Con trol
H D L C- B H ig h - Level Da ta Link Con trol - Ba la nced H D L M S Hy brid Da ta Link Ma n age ment Syste m H D O P Horizon tal Dilution of Prec i s ion H D OT In ert ial Vert ical Speed
H D P Ha rdwa re Deve lo pment Pla n
H E Altitude Error
H e a d i n g The di rect ion of an airc raft pa th wi th res pect to m agn e t ic or true north .
H F H igh Freque nc y. The port ion of the ra dio spectrum from 3 to 30 MHz. HF com mun ic a t ion syste m s o pera te in the 2 to 30 MHz port ion of the spectrum . H F D L H ig h - Freque ncy Da ta Link
H F D M HF Da ta Mod e m
H F D R H igh Freque ncy Da ta Radio
H F N P D U H igh Freque ncy Ne twork Pro toc ol Da ta Un i t H F S H igh Freque ncy Syste m
H F S G Human Factor Study Gro u p H F S N L HF SubNe twor kL ayer H G A H igh Gain An te n n a
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