| 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 |
| Any instrument, mechanism, equipment, part, apparatus, annex or accessory, including communication equipment, installed on or attached to the aircraft and used or intended to be used for operation or control of an aircraft in flight and that does not constitute part of an airframe, engine or propeller |
| A Specific or Certified operation |
| An Open or Specific operation |
EN 