AT-400 family
An AT-402 in operation, spraying a field in Washington State
Role	Agricultural aircraft Type of aircraft
Manufacturer	Air Tractor
First flight	1979
Introduction	1980
Status	Active, in production
Produced	1979-present

The Air Tractor AT-400 is a family of agricultural aircraft that first flew in the United States on September 1979. Type certification was awarded to Air Tractor in April 1980. Of low-wing monoplane taildragger configuration, they carry a chemical hopper between the engine firewall and the cockpit.

Variants

• AT-400 - AT-301 with 680 shp (507 kW) Pratt & Whitney Canada PT6A-15AG engine and 400 US gal (1,510 L) hopper. Short-span (45 ft 1¼ in (13.75 m)) wings.^[1] 72 built.^[2]
• AT-400A - AT-400 with 550 hp (410 kW) Pratt & Whitney Canada PT6A-20 engine.^[1] 14 built.^[2]
• AT-401 - AT-301 with longer-span wings and 400 US gal (1,510 L) hopper, powered by 600 hp (447 kW) Pratt & Whitney R-1340 radial engine.^[3] 168 built.^[2]
• AT-401A - AT-401 with PZL-3S engine. One built.^[2]
• AT-401B -Improved revision of AT-401, with revised wingtips and further increased span (51 ft 1¼ in (15.57 m)). 69 built by December 2001.^[2]
• AT-402 - AT-401 with Pratt & Whitney Canada PT6A-15 engine.^[3] 68 built.^[2]
• AT-402A - low cost version of AT-401B, with Pratt & Whitney Canada PT6A-20 engine.^[2] 103 built by December 2001.^[2]
• AT-402B - improved version of AT-402, with revised wingtips and increased span of AT-401B.^[2] 31 built by December 2001.^[2]

Aircraft on display

• AT-400A N3159D is on display at the Steven F. Udvar-Hazy Center in Chantilly, Virginia. It is decorated in a livery depicting Dusty Crophopper from the 2013 animated film Planes, having been given the livery at the request of Disneytoon Studios prior to its acquisition by the museum.^[4]

Specifications (AT-401)

Data from Janes's All The World's Aircraft 1993-94.^[3]

General characteristics

• Crew: 1
• Capacity: 400 US gal (330 imp gal; 1,500 L) hopper
• Length: 27 ft 0 in (8.23 m)
• Wingspan: 49 ft 1+1⁄4 in (14.97 m)
• Height: 8 ft 6 in (2.59 m)
• Wing area: 294.0 sq ft (27.31 m²)
• Aspect ratio: 8.20:1
• Airfoil: NACA 4415
• Empty weight: 4,135 lb (1,876 kg)
• Max takeoff weight: 7,860 lb (3,565 kg)
• Powerplant: 1 × Pratt & Whitney R-1340 radial engine, 600 hp (450 kW)

Performance

• Maximum speed: 156 mph (251 km/h, 136 kn) at sea level
• Cruise speed: 120–140 mph (190–230 km/h, 100–120 kn) (typical working speed)
• Stall speed: 61 mph (98 km/h, 53 kn) at 6,000 lb (2,700 kg) (max. landing weight) (flaps down)
• Range: 630 mi (1,010 km, 550 nmi)
• Rate of climb: 1,100 ft/min (5.6 m/s)