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- Phonetic Alphabet
Instrument Flying Handbook
FAA
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Aeronautical Chart User's Guide
NOAA
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Plane Sense
FAA
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Today's Aeronautical Terms
Initial Approach
The segment between the initial approach fix and the intermediate fix or the point where the aircraft is established on the intermediate course or final approach course.
[Source: Pilot/Controller Glossary]
Low Altitude Airway Structure
The network of airways serving aircraft operations up to but not including 18,000 feet MSL.
[Source: Pilot/Controller Glossary]
Hazardous Inflight Weather Advisory Service (HIWAS).
Service providing recorded weather forecasts broadcast to airborne pilots over selected VORs.
[Source: Instrument Flying Handbook]
Absolute vorticity
The rotation of the Earth imparts vorticity to the atmosphere; absolute vorticity is the combined vorticity due to this rotation and vorticity due to circulation relative to the Earth (relative vorticity).
[Source: Aviation Weather]
Density
(l) The ratio of the mass of any substance to the volume it occupies—weight per unit volume. (2) The ratio of any quantity to the volume or area it occupies, i.e., population per unit area, power density.
[Source: Aviation Weather]