A device or theoretical construct with known or specified performance traits but as yet not known or unspecified constituents and means of operation.
Something that is mysterious, particularly as to purpose.
See journey recorder.
casual title for the colorful cockpit vocals recorders and journey data recorders in an aircraft made to help with determining the explanation for any sort of accident.
A theoretical construct or device with known input and output characteristics but unidentified way of procedure.
any electronic instrument or part of a musical instrument whose purpose is defined, but which will be addressed as a unit without consideration of inner mechanisms; generally, any device whose internal workings are believed as incomprehensible or mystical because of the individual.
a device which maintains a record of seat conversations and also the readings of many of tools agreeable an aircraft, continually or at regular time periods during a flight. It's of rugged design to endure a violent crash, and is used to figure out the sources of aircraft accidents.
equipment that registers information about the performance of an aircraft during journey