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The AT-400 was a turboprop version of the AT-302A and was quickly
followed in 1980 by the AT-400A which was powered by a 550shp(410kW) P&W
PT6A-20. The AT-401 (198 built) first flew in 1986 powered by a
600shp(447kW) P&W and with a maximum take-off weight of 8250lb(3745kg)
and wingspan increased to 51’0”(15.53m). This was in turn followed by
the AT-401A (1 built) powered by a 592hp(441kW) PZL 3S radial engine.
This was developed as the AT-401B (69 built) powered by a 600hp(447kW)
P&W R1340 radial and with a maximum take-off weight of 7860lb(3568kg).
The AT-402 (82 built) first flew in 1988 powered by a 680shp (507kW) P&W
PT6A-15AG and had a maximum take-off weight of 7800lb(3540kg). The
AT-402A (67+ built) and the AT-402B (170 built) were similar to the
AT-402 with a slight increase in maximum take-off weight. The aircraft
illustrated below is an AT-402A.
N50761 c/n 402A-1065 USA
Single seat agricultural aircraft first flown in 1979
Engine: 680shp(507kW) P&W
PT6A-15AG
Length: 27’4”(8.33m) Height: 10’11”(3.32m)
Wingspan: 51’0”(15.54m)
No.built: 72
Range: 450miles(724kmh)
Cruising speed: 165mph(265kmh) Empty weight: 3550lb(1610kg)
Maximum take-off weight: 7860lb(3395kg)
Illustrated below is an
example of an AT-401 which has been re-engined with a 500shp(372kW) Orenda OE 600A.
This version was first flown in 1999 and has resulted in an improvement
in overall performance.
N60110 c/n 401-0954
The company displayed an example of the AT-500 in 1984 at the National
Agricultural Aircraft Association’s national convention at Las Vegas,
Nevada. This was the prototype for a series of larger Air Tractors which
resulted in the AT-501 (11+ built), a two seat version powered by a
600hp(447kW) P&W R-1340-S1H1G radial and first flown in 1987.
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