· 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