Let L-410 Turbolet is a transport and transport airplane capable of landing in small and untouched aerodromes. Although primarily designed for regional transport, it is also able to operate under extreme conditions from -40 ° C to + 50 ° C thanks to the ILS CAT 1 electronic instrumentation system and instrument flight certification. The fuselage consists of a metal half-shell and a two-beam wing equipped with two-slot flaps and spoilers. The propulsion unit of the airplane is two Walter M 601 turboprop engines with Avia V508 or V 510 propellers, which are fixed speed propellers with the possibility of batting and reversing.
At the turn of the 1950s and 1960s, Aeroflot demanded an airplane with a capacity of 10 to 12 people to replace Antonov An-2, more than ten years old. In 1968, the construction of the first three prototypes, the other of which was designed for the breaking test, began. Propulsion units have been purchased with a 526-kW Pratt & Whitney Canada PT6-A27 engine with Hamilton 23LF-343 three-stroke propellers, later replaced by Hartzell HC-B3TN-3D propellers.
The prototype of the machine marked XL-410 was flown on April 16, 1969 by the factory pilots Vladimír Vlk and ing. František Svinka. During the flight tests of the prototypes, several dragon designs were made. The fuel tank was enlarged and the chassis design revised. The retractable system has also changed, which has fallen to the hull axis. Beneath the back of the fuselage was a small keel. In April 1972, one L-410A was presented to Moscow by Aeroflot representatives, then with the OK-CKA registration number. Less than a year later, the CCCP-67251 was launched as the first L-410 aircraft for the Soviet customer. After the development of the Czechoslovak engine Walter M601, they were replaced by the original PT-6 engines, they got the three-blade propeller Avia V508. This modified aircraft began to be called the L-410M.
The L-410UVP, the first prototype of which took off in November 1976, has an extended hull, an enlarged wing span whose stabilizer bumper was adjusted to + 7 ° and interceptors added. In addition, an automatic bank control was added to the automatic battalion system, which automatically opens when a single engine fails, but only at a speed of 205vkm / hour. The machine also got improved equipment and brakes. From the beginning, the M601B engines were installed, later replaced by the M601D engines with V508D propellers. The airplane took 15 passengers and was able to pull off the ground after approximately 456 meters.
Its most common variant is the L-410UVP-E with increased maximum take-off weight, the stronger Walter M601E engines and the V510 five-seater propellers. The ends of the wings can be fitted with external tanks. The prototype of this variant took off in 1984 and 1985 began with serial production. The existing UVP-E9 and UVP-E20 pods differ only in detail to comply with JAR 25 FAR-23. Aircraft L-410 from version M to E, including versions E9 and E20 have a type certificate issued by EASA, only the last mentioned version equipped with M601F engines was also certified by the US FAA as L-420. From the L-410 version, the larger L-610 was also launched with a pressurized cab, which, unfortunately, only came out in several prototypes.
Let L-410 NG
The first takeover of the new version was successfully completed on July 29, 2015. The new H85 engine with 850 HP take-off power and AV 725 propellers is powered by the engine. The engine speeds up to 417 km / h. Modernization has also gone through the pilot cabin, which is newly equipped with G 3000 avionics (Glass Cockpit). Another innovation is the double increase of the front luggage compartment, which increases the payload by approximately 400 kg. Thanks to nearly twice the volume of integral fuel tanks, the range of this machine is now up to 2,500 km. Launch of series production of the L 410 NG is planned after the certification tests are completed in 2017.
- L-420 XXL
|Manufacturer||Let Kunovice (now Aircraft Industries a.s.)|
|Engine||2 x Walter M 601|
|Engine power||2 x 560 kW|
|Wing area||35,18 m²|
|Available||7 000 m|
|Flying range||1 040 km|