Abbreviations and Acronyms

· abs - absolute

· abv - above

· ADIRU - air data inertial reference unit

· AGL - above ground level

· AI - attitude indicator

· ant - antenna

· arpt - airport

· ATC - air traffic control

· ATCRBS - air traffic control radar beacon system

· BITE - built-in-test equipment

· blw - below

· CDS - common display system

· CPA - closest point of approach

· CPU - central processing unit

· CTR - center

· DEU - display electronics unit

· DME - distance measuring equipment

· EFIS - electronic flight instrument system

· exp - expanded

· FDAU - flight data acquisition unit

· FL - flight level

· FPM - feet per minute

· fwd - forward

· gnd - ground

· GPWC - ground proximity warning computer

· grd - ground

· ident - identification

· IF - intermediate frequency

· INT - interrogator

· I/O - input/output

· L - left

· LED - light emitting diode

· max - maximum

· MHz - megahertz

· NCD - no computed data

· NM - nautical miles

· norm - normal

· R - right

· RA - resolution advisory

· rel - relative

· REU - remote electronic unit

· RF - radio frequency

· R/T - receiver/transmitter

· stby - standby

· sw - switch

· TA - traffic advisory

· TAS - true airspeed

· TAU - time to closest point of approach

· TCAS - traffic alert and collision avoidance system

· tfc - traffic

· trk - track

· VOR - very high frequency omnidirectional range

· VSI - vertical speed indicator

· wpt - waypoint

· xfr - transfer

· xpndr – transponder