Khrunichev Center: Aircraft Production

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Light Short Takeoff and Landing Aircraft T-411 (T-421)

Light multipurpose five-seat short take-off and landing (STOL) aircraft T-411 "Aist" is intended to carry passengers and cargoes over distances up to 1200 km.

The aircraft can be easily reconfigured to carry out the following missions: flying as an ambulance or performing hydrometeorological surveillance, ecological monitoring, aerotaxi operations, primary pilot training.

The aircraft features a high degree of reliability and safety. It is easy in piloting and maintenance, requires very simple ground equipment and has a comparatively low price.

Designing of the aircraft was started in September of 1992, construction of the prototype in April of 1993. The first flight was made November 10, 1993.

DESIGN FEATURES:

The aircraft has a conventional aerodynamic configuration with high braced wing.

The wing is straight (unswept), two-spar, with constant chord. It is supported by V-formed brace struts and features fixed slats, slotted ailerons and single-slot flaps. Dihedral is 2°, incidence is 3°30’. The airfoil is NACA-23011. The wing is covered with high-strength synthetic "Poly-Fiber (STITS)" fabric. The area around the fuel tanks in the wing root portion is covered with metal skin.

The fuselage is of rectangular truss construction welded from steel tubes. Each side of the cabin is provided with a forward-opening door. The cargo compartment located aft of the cabin is provided with a large upward-opening door to load cargoes, baggage or a stretcher.

The tail unit has a taper vertical fin with a dorsal fin and a straight constant-chord stabilizer. The tail surfaces are covered with the "STITS" fabric.

The landing gear is of conventional tail-wheel type with non-retractable units. Each main spring-type unit has a brake-fitted wheel, 600x180 mm, while the tail spring-type unit has a castoring wheel, 300x135 mm.

Provisions have been made to install floats (aircraft T-411P)

POWER PLANT:

The power plant comprises one reciprocating radial nine-cylinder air-cooled engine M-14P (Russia) rated at 360 hp (265 kwt) and three-blade adjustable-pitch propeller MTV-9. The fuel is carried in four fuel tanks (260 kg or 340 liters in total) located in the wing root portion. The fuel is fed by gravity flow.

Provisions have been made to install foreign engines ²Lycoming² or ²Continental² rated at 350 hp.

AIRCRAFT SYSTEMS:

The aircraft control system is made dual for the left and right pilot stations. The ailerons, elevators and rudder are controlled mechanically by hand while the elevator trim tabs and flaps are controlled electrically.

The pneumatic system serves to start the engine and actuate the main gear wheel brakes. Used as power sources are an air bottle and a compressor on the engine. The pressure in the system is 50 atm.

The electrical system comprises engine-driven 27-V DC generator GSR-3000M and a storage battery 12SAM-28.

Cabin ventilation and heating system uses the ambient air heated by the hot air from the engine oil cooler.

ON-BOARD EQUIPMENT:

The standard set of the on-board equipment can provide execution of flights in the VFR weather conditions. The set consists of the basic flight instruments including gyro horizon AGB-96B, automatic direction finder ARK-25, satellite navigation system (GPS) and radio-communication equipment.

An option is offered to the customers to have additional equipment installed on the aircraft to perform flights in the IFR weather conditions.

SPECIFICATIONS:

Characteristics	Aircraft T-411	Aircraft T-421	Aircraft T-411P
Engine: - power	M-14P (TIO-550) 1 x 360 hp	Chevrolet V8 1 x 350 hp	M-14P (TIO-550) 1 x 360 hp
Crew	1 - 2	1	1-2
Passengers	3 - 4	3 - 4	3-4
Take-off weight	1600 kg	1750 kg	1700
Fuel capacity	260 kg (340 lit)	260 kg (340 lit)	260 kg (340 lit)
Useful load	650	700 kg	550
Maximum speed	200 km/h	260 km/h	180
Flight range: - with normal fuel - with maximum fuel	700 km 1200 km	700 km 1350 km	700 km 1000 km
Take-off distance (H=15 m)	240 m	300 m	475
Landing distance (H = 15 m)	250 m	350 m	305

Last Updated: October 07, 2001