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Today's Terms
Vestibular Illusions
Definition:
In the absence of visual reference, we rely on our vestibular system to keep us oriented. But as previously explained, this system is totally unreliable for this purpose when in motion.
SIGMET
Definition:
An in-flight weather advisory that is considered significant to all aircraft. SIGMET criteria include severe icing, severe and extreme turbulence, duststorms, sandstorms, volcanic eruptions, and volcanic ash that lower visibility to less than 3 miles.
Cloud tops
Definition:
You cannot climb through a front with tops to 30,000 feet. For most light nonturbocharged aircraft, once the tops reach 8,000 feet, climbing is no longer an option.
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