Former CzechCzechoslovak fighter pilot 1 ! and his family were safely j1 in Austria today after a dramatic escape from behind the Iron Curtain in a solen 1 two-seater plane. '* Janus Pavelka, 40. a war- j * time Royal Air Force flier, j1told Austrian police he had i 1 waited 10 years for h i s | '* chance. 11Last Saturday Pavelka, his I wife, Eva, 35; his son, Janus, i 1 4; his daughter Maria, 6; and 1 his brother-in-law, Vaclav, 15, lt;j crept into the plane at the; • j Aero Club of Deutsch Brod— i lt;onlv a few' hundred vards^■r ^ ^from a military air base. iThe base was deserted be- i! cause its staff had gone to, ( the International Trade Fair in nearby Brno, Pavelka had i been told. iHe shoved the two young- •; est children under the seats because of the lack of room, j 1 and then tried to start the plane. He failed time after time but kept trying.Then, after 30 minutes of frantic efforts, the overloaded plane took off in the direction of Austria.Pavelka. who has not flownfor at least 10 vears, man-W raged to land in a wheat fieldnear Arbesbach, lower Aus* I tria, with a broken propeller I and damaged fuselage.Vienna (UP!) — A former