HA-31 Basant
Role	Agricultural/utility aircraft Type of aircraft
Manufacturer	Hindustan Aeronautics
First flight	1972 (Mark II)
Produced	1972-1980
Number built	39

The Hindustan Aeronautics HA-31 Basant (en: "Spring") is a 1970s Indian agricultural monoplane built by Hindustan Aeronautics.

Hindustan Aeronautics started to design an agricultural aircraft in 1968 designated the HAL-31 Mk 1 with a cockpit directly over the wing leading edge. It was re-designed as the HA-31 Mk II Basant and first flew on the 30 March 1972. The Basant is a conventional braced low-wing monoplane with a fixed tailwheel landing gear and powered by a 400 hp (298 kW) Avco Lycoming IO-720 piston engine. It had a raised cockpit to give the pilot a good all-round view during spraying operations. Production ended in 1980 after 39 aircraft had been built.

Specifications (Mk II)

Data from The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985), 1985, Orbis Publishing, Page 2160

General characteristics

• Crew: One
• Length: 29 ft 6.25 in (9.0 m)
• Wingspan: 39 ft 4.5 in (12 m)
• Height: 8 ft 4.5 in (2.55 m)
• Wing area: 251.23 sq ft (23.34 m²)
• Empty weight: 2,645 lb (1,200 kg)
• Gross weight: 5,000 lb (2,270 kg)
• Powerplant: 1 × Avco Lycoming IO-720-C1B flat-eight piston engine , 400 hp (298 kW)

Performance

• Maximum speed: 140 mph (225 km/h, 120 kn) ^[1]
• Cruise speed: 115 mph (185 km/h, 100 kn)
• Range: 400 mi (645 km, 350 nmi) ^[1]
• Service ceiling: 12,500 ft (3,800 m) ^[1]
• Rate of climb: 750 ft/min (3.8 m/s) ^[1]