Question id 96 - Flight performance and planning - EASA Drone Quiz

4C
None of the previous answers is correct
Any instrument, mechanism, equipment, part, apparatus, annex or accessory, including communication equipment, installed on or attached to the aircraft and not used or intended to be used for the operation or control of an aircraft in flight and which forms part of an airframe, engine or propeller
Any instrument, mechanism, equipment, part, apparatus, annex or accessory, including communication equipment, installed on or attached to the aircraft and not used or intended to be used for the operation or control of an aircraft in flight and which does not form part of an airframe, an engine or a propeller