Abbreviations and Acronymns

· abs - absolute

· abv - above

· ADIRS - air data inertial reference system

· ADIRU - air data inertial reference unit

· AD - air data

· ADR - air data reference

· alt - altitude

· amp - amplifier

· ant - antenna

· ATC - air traffic control

· ATCRBS - air traffic control radar beacon system

· BITE - built-in test equipment

· blw - below

· bot - bottom

· coax - coaxial

· cntl - control

· CPU - central processing unit

· DME - distance measuring equipment

· ELEX - electrical

· FL - flight level

· gnd - ground

· ID - identification

· I/O - input/output

· ident - identification

· INS - instrument

· INT - interrogator

· LED - light emitting diode

· MAX - maximum

· MHz - mega hertz

· N - normal

· NC - not connected

· norm - normal

· pnl - panel

· PSR - primary surveillance radar

· RA - resolution advisory

· REL - relative

· RF - radio frequency

· rptg - reporting

· RX - receive

· SDI - source destination identifier

· sig - signal

· SLS - side lobe suppression

· SSR - secondary surveillance radar

· SPI - special purpose identification

· stby - standby

· sw - switch

· TA - traffic advisory

· TAS - true air speed

· TCAS - traffic alert and collision avoidance system

· tpr - transponder

· TX - transmit

· XFR - transfer

· xmtr - transmitter

· xpdr - transponder

· xpndr – transponder