Aviation Maintenance Terms beginning with S

Sea level engine

A reciprocating aircraft engine having a rated takeoff power that is producible only at sea level.

Small aircraft

Aircraft of 12,500 pounds or less, maximum certificated takeoff weight.

Small unmanned aircraft

An unmanned aircraft weighing less than 55 pounds on takeoff, including everything that is on board or otherwise attached to the aircraft. Small unmanned aircraft system (small UAS)means a small unmanned aircraft and its associated elements (including communication links and the components that control the small unmanned aircraft) that are required for the safe and efficient operation of the small unmanned aircraft in the national airspace system.

Supplemental restraint system

Any device that is not installed on the aircraft pursuant to an FAA approval, used to secure an individual inside an aircraft when that person is not properly secured by an FAA- approved safety belt and, if installed, shoulder harness, or an approved child restraint system. It consists of a harness secured around the torso of the individual using the supplemental restraint system and a lanyard that connects the harness to an FAA-approved airframe attachment point inside the aircraft.