Summary
We propose to adopt a new airworthiness directive (AD) for certain Eclipse Aerospace, Inc. (Eclipse) Model EA500 airplanes. This proposed AD would require incorporating changes to the electronic flight information system and the airplane flight manuals. This proposed AD results from reports of uncommanded changes to the communications radio frequency, altitude preselect, and/or transponder codes. We are proposing this AD to correct faulty integration of hardware and software, which could result in unannunciated, uncommanded changes in communications radio frequency, transponder codes, and altitude preselect settings. These uncommanded changes could result in loss of communication with air traffic control due to improper communications frequency, autopilot level off at the incorrect altitude, or air traffic control loss of proper tracking of the aircraft.