KIAS
Knots indicated airspeed.
PHAK Glossary — K
3 terms, every entry under this letter, no curation. Definitions reproduced verbatim from the Pilot's Handbook of Aeronautical Knowledge glossary, FAA-H-8083-25C (July 2023).
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Knot
The knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph.
Kollsman window
A barometric scale window of a sensitive altimeter used to adjust the altitude for the altimeter setting.
Source. Definitions: Pilot's Handbook of Aeronautical Knowledge glossary, FAA-H-8083-25C (July 2023), reproduced verbatim from https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak. A United States Government work. Selection: none — every entry under this letter, no curation. Check the current publication before you rely on any of it.