Latest Antonov An-74 variant now firmly in flight-test trials | Aviation International News

Latest Antonov An-74 variant now firmly in flight-test trials

Ukraine’s Antonov An-74TK-300 made its international debut at this year’s Paris Air Show.

By Vladimir Karnozov

May 21, 2008

Ukraine’s Antonov An-74TK-300 made its international debut at this year’s Paris Air Show. First flown in April, the airplane had, as of mid-July, flown 35 times, including 20 missions for its certification program. It differs from the basic An-72/74 family of twinjets in its underwing engine pylons. The An-74TK-300’s Progress D36 powerplants use a thrust-reverser system derived from that on the An-124 Ruslan’s D18Ts, accounting for the only difference from the ordinary D36 series engines.

Previous An-72/74 variants have the engines mounted on top of the wing to produce a Coanda wing-overblowing effect and to protect the engines from stones and other foreign objects on takeoff and landing. Designers chose the configuration to please military customers requiring STOL (short takeoff and landing) performance. The penalty was high fuel consumption in cruise flight as wing overblowing produces extra drag, reducing the lift-to-weight ratio.

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