Coriolis illusion. The illusion of rotation or movement in an entirely different axis, caused by an abrupt head movement, while in a prolonged constant rate turn that has ceased stimulating the brain’s motion sensing system.
Crew resource management (CRM). The effective use of all available resources—human, hardware, and information.
Critical areas. Areas where disturbances to the ILS localizer and glide slope courses may occur when surface vehicles or aircraft operate near the localizer or glide slope antennas.
CRM. See crew resource management.

Cross-check. The .rst fundamental skill of instrument . ight, also known as “scan,” the continuous and logical observation of instruments for attitude and performance information.
Cruise clearance. An ATC clearance issued to allow a pilot to conduct .ight at any altitude from the minimum IFR altitude up to and including the altitude speci.ed in the clearance. Also authorizes a pilot to proceed to and make an approach at the destination airport.
Current induction. An electrical current being induced into, or generated in, any conductor that is crossed by lines of . ux from any magnet.
DA. See decision altitude.