High Quality Content by WIKIPEDIA articles! The PZL TS-11 Iskra (Polish for Spark) is a Polish jet trainer aircraft, used by the air forces of Poland and India. It is notable as the main trainer plane of the Polish Army, the oldest jet plane still in service in Poland - and one of the most reliable. The aircraft was designed in response to a Polish Air Force requirement for a jet trainer. The main designer was Tadeusz So?tyk - hence a designation letters TS. The new plane was the first jet aircraft designed in Poland. Work started in 1957, the first prototype powered by an imported British Armstrong Siddeley Viper 8 of 7.80 kN (1,750 lbf) was flown on February 5, 1960. The next two prototypes, with a Polish copy of the Viper engine named the WSK HO-10 engine were flown in March and July 1961.

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