The Weatherly 620 is a 1970s American agricultural monoplane designed and built as an improved variant of the Weatherly 201 by the Weatherly Aircraft Company of McClellan, California. The Weatherley 620 is an all-metal single-seat low-wing cantilever monoplane with a conventional landing gear with a tailwheel. Examples have been fitted with a Pratt & Whitney R-985 radial engine, and PT6A or TPE331 turboprop engine, driving a three-bladed tractor propeller. In the forward fuselage, the aircraft has a 355 US gallon (1344 litre) hopper that feeds an agricultural dispersal system. Variants Model 620 1979 initial production variant. Model 620A 1987 production variant with a Pratt & Whitney R-985 radial engine. Model 620B 1992 production variant with a Pratt & Whitney R-985 radial engine. Model 620TP 1980 turboprop variant with a Pratt & Whitney PT6A-11AG. Model 620B-TG 1997 improved turboprop variant to replace the 620TP with a Honeywell TPE331 turboprop.
