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Glossary - S

SAC	Strategic Air Command
SAM	Surface-to-air missile
SAR	Search and Rescue
SEL	Selected
semi-monocoque	A structure in which the loads are carried partly by the frame and stringers and partly by the skin.
shp	Shaft horsepower. Horsepower measured at an engine output shaft.
SID	Standard Instrument Departure
SLAR	Side-looking Airborne Radar
SRW	Strategic Reconnaissance Wing
stall	The point at which the airflow breaks away from an aerofoil and lift is lost due to the change in the angle of the surface to the airflow. Can also happen to compressor blades of a gas turbine engine, causing loss of thrust.
STAR	Standard Terminal Arrival Route
STOL	Short Take Off and Landing
supersonic	Faster than the speed of sound.