Plain English Meaning
The belts that hold pilots and passengers in their seats. Pilots are allowed to replace these themselves as a permitted maintenance task, without needing a mechanic.
Full Definition
Restraint devices installed at each seat in an aircraft that secure occupants to the seat structure during flight, takeoff, landing, and turbulence. In the context of preventive maintenance, safety belts are an item a certificated pilot owner or operator may replace on their own aircraft without holding a mechanic certificate, provided the work is done in accordance with the manufacturer's instructions and properly logged.
Context Anchor
Seen during preflight inspection, passenger , and preventive maintenance items involving seat restraint equipment.