Plain English Meaning

Parts of the airplane that don't hold the aircraft together or carry flight loads. Things like seat belts, cabin upholstery, landing light bulbs, and fairings — items a pilot is allowed to service themselves under the preventive maintenance rules.

Full Definition

Aircraft components that are not part of the load-bearing structure of the airframe and whose condition does not affect the aircraft's structural integrity. In the context of preventive maintenance, these are items a certificated pilot owner or operator may legally service or replace without requiring a certificated mechanic, because on them does not alter the aircraft's , , or .