After few perfect flights, i suddendly lose power. It's happened twice this evening exactly just about 100 or 200ft before reaching crusing altutite (6500ft) . Engines power suddenly decreased for unknown reason. I've then tried the Real Air Beech Duke with exactly same flight, same wx conditions and same altitude and nothing went wrong. Any idea?

When that happens to me I hit the "h" key "carburator heat", I know this is a flaw with FSX but it usually fixes the problem. Give it a try! Also try "Ctrl X" which will lean the mixture.... CheersMartin

Thank you Martin. We'll see next flight.