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Q-CODE
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Code system developed when air-to-ground communication was by wireless telegraphy, enabling many routine phrases and questions to be reduced to three letters.
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QUADRAPLANE
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An aircraft having four or more wingforms.
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RABBIT LIGHTS
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Colloquialism for sequentially flashing lead-in runway approach lights.
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RAMP WEIGHT
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Maximum permissible weight of an aircraft, which exceeds maximum take-off weight by an allowance for fuel burned during engine-start and taxi.
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SEAPLANE
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A water-based aircraft with a boat-hull fuselage, often amphibious. The term is also used generically to define a similar Flying Boat and a pontoon.
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SERVICE CEILING
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The height above sea level at which an aircraft with normal rated load is unable to climb faster than 100' per minute under Standard Air conditions.
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SINK, SINKING SPEED
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The speed at which an aircraft loses altitude, especially in a glide in still air under given conditions of equilibrium.
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SLIP
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Too steep a bank in a turn, causing an aircraft to slide inward from its ideal turing path.
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STANDARD AIR (Standard Atmosphere)
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An arbitrary atmosphere established for calibration of aircraft instruments.
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STANDARD RATE TURN
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A turn in which the heading of an aircraft changes 3° per second, or 360° in two minutes.
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STATIC WIRE
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A clip-on wire used to ground an aircraft by drawing off static electricity, a potential fire hazard, during refueling.
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SUPERSONIC
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Speed of flight at or greater than Mach 1.0; Faster than the speed of sound.
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