Aviation Maintenance Terms beginning with E

Enhanced Visual Acquisition (EVAcq)

This application is an enhancement for the outthe-window visual acquisition of aircraft traffic and potentially ground vehicles.

Estimation

The process of determining a track’s state based on new measurement information.

Extended Squitter

A long (112 bit) Mode S transmission that is spontaneously produced by the radio as opposed to a response to a Mode S Interrogation. Extended Squitter is the mechanism used to provide ADS-B messages from a Mode S transponder.

Extrapolation

The process of predicting a track’s state forward in time based on the track’s last kinematic state.