What was found
DEPARTING OGG ON FLIGHT 512 WITH 9 PAX ONBOARD. ON ADDING POWER TO TAKE OFF OGG, FRONT END OF ACFT STARTED TO SHAKE VIOLENTLY. PROPELLER WAS AT 1900 RPM & TORQUE WAS APPROX 1700 LBS WITH INTENTION OF CONTINUING TO ADD POWER TO APPROX 2000 LBS FOR TAKE OFF. AIRSPEED INDICATIONS WERE NOT PRESENT YET. CALLED FOR AN ABORTED TO & PULLED POWER TO IDLE & SHAKING SUBSIDED. NOTIFIED OGG TOWER THAT WE ABORTED TAKEOFF & NEEDED TO RETURN TO GATE & DIDN’T NEED ASSISTANCE OR EMERGENCY CREWS. ONCE SHUTDOWN, NOTIFIED PAX THE TAKEOFF WAS ABORTED DUE TO SHAKING & WOULD KEEP THEM INFORMED ON DETAILS REGARDING THEIR FLIGHT TO MKK. DISPATCH & MX NOTIFIED.