← Back to Aviation Glossary
Airspace
Defined areas of the atmosphere designated by the FAA with specific rules and requirements for aircraft operations. U.S. airspace is classified into Classes A, B, C, D, E, and G, each with different visibility, cloud clearance, and communication requirements.
Want to go beyond the definition? This term is covered in depth in AviatorPro's Private Pilot License ground school.
Learn more in Private Pilot License →Related Terms
- Airspeed IndicatorA flight instrument that displays the aircraft's speed through the air, typically in knots. It works by measuring the difference between pitot (ram air) pressure and static pressure. The indicator features colored arcs showing operating speed ranges.
- AirworthinessThe condition in which an aircraft conforms to its type design and is in a condition for safe flight. Under 14 CFR 91.7, no person may operate a civil aircraft unless it is airworthy, and the pilot in command is responsible for that determination before each flight.
- Airworthiness CertificateThe FAA document that authorizes an aircraft to operate in the standard or special category for which it was certificated. Under 14 CFR 91.203, an appropriate and current airworthiness certificate must be onboard; it remains valid only while the aircraft is maintained and inspected as required.
- AltimeterA pressure instrument that displays altitude by sensing static air pressure. Pilots set the local altimeter setting (from ATIS, AWOS, ASOS, or ATC) so indicated altitude matches the elevation of the reporting station when on the ground.