The first operational deployment of Fw-190 at Eastern Front was September, 15, 1942 at Leningrad area.

Ty very much Gitano :)
~S~

There is a good new book Focke-Wulf FW190: Volume One 1938-1943 by Smith and Creek. The book has a section with JG26 technical in May 1942. "It is therefore suggested to increase to boost pressure of the D-Type to 1.42 ata." Early Fw190A1, A2 and A3 had problems with oil pipe ruptures, seized pistons and bad vibrations.