Generally, airspace from 18,000 feet MSL up to and including FL600.
Authorization from air traffic control for an aircraft to proceed under specified conditions.
A device used to record the audio environment in the flight deck for accidents and incident investigation.
The area where pilots control the aircraft, also known as the flight deck.
Turbulence encountered by aircraft when flying through air containing no visible moisture or suspended particles.
The region of flight where the margin between high speed buffet and low speed stall converges.
The air pressure inside the aircraft’s cabin, typically maintained at a comfortable and safe level for passengers and crew.
The angle of attack which produces the maximum lift coefficient. This is also called the stall angle of attack.
The asymmetry between the two acting surfaces of an airfoil.
The component of wind velocity perpendicular to the runway or the flight path.
