As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH IN TO DFW, A HIGH SPEED VIBRATION WAS FELT IN THE YOKE WHEN THE FLAPS WERE SELECTED AND POWER REDUCED. NO VIBRATION NOTED ON TAKEOFF OR PREVIOUS LANDING, FLAPS SELECTED 15 AT 175 KNOTS AND CONTINUED WITH FLAPS 20 UNTIL LANDING. NO VIBRATIONS NOTED WITH NO FLAPS. (M)