I publish these pictures because in aviation we have the tradition, that we should talk about our mistakes so that others must not make them again! After first rotor test runs, the engine had logged 1 hour and 52 minutes only, I was checking the setting in the TCU(turbine control unit) again and discovered an engine over speed in the stored data file. According Rotax maintenance manual rpm more than 6200 rpm means an engine overhaul! Reason for the overspeed: My mistake, I selected initially for the very first engine run the wrong engine-rpm-probe for the EFIS input! As a consequence I had to remove the engine and drive it to Munich for a complete overhaul and pick it up 4 weeks later again! (One weekend to remove it and 4 days Easter-holiday to install it again!) Lessons learned: Never run the freshly installed engine for the first time without controlling and observing engine rpm via data link and laptop! Quite an expensive mistake, but after engine overhaul the TBO was increased from 1500 hours to 2000 hours, at least that! The engineers at Franz in Munich did a very nice job, I could pickup the engine again after about 4 weeks only. By the way: During the very first engine run I found an rpm difference between EFIS indication and TCU rpm of only about 10 rpm!
