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The callsign "heavy" refers to any plane whose maximum certificated takeoff weight (MTOW) exceeds 255,000 pounds. This callsign is used because heavier planes make more wake turbulance, which poses a real but unseen flight hazard to light planes.
Iroc..
You may be thinking of the FAA regulation that defines Large and Small aircraft. 14CFR 1.1 defines LARGE as an aircraft of more than 12,500 pounds, maximum certificated takeoff weight. However, being large does not automatically mean heavy.
Except when referring to women from the south.
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Last edited by cashflyer; 01-05-2006 at 11:55 AM..
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