As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1020 - GRB-MKE - ABORTED TAKEOFF DUE TO DECREASE IN PROPELLER RPM FROM 1700 RPM TO 1400 RPM IN FIVE SECONDS. THE A/C WAS FERRIED BACK TO MKE. MAINTENANCE INSPECTED A/C FOUND RT N2 TACH GENERATOR BAD. REPLACED RT N2 TACH GENERATOR OPS CHECK GOOD. RETURNED A/C TO SERVICE. (M)