Further to what was said about flying the An2, I have heard that pilots of Russian built aircraft have a great deal of trouble converting to Western aircraft - especially when they are high time pilots. Russian aircraft generally use "ground pointing" AH's while western aircraft use the opposite. Hence when crews convert, the read the indications on the AH backwards and apply the wrong control inputs. Some ex-TU154 crews converted to 767's by Ansett apparently had lots of trouble and some of the older ones never made it.