As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE VISIT: PILOT REPORTS CLIMBING THROUGH 11, 000 FT BETWEEN 250-280 KNTS. BOTH SET OF RUDDER PEDALS HAD A HARD FAST VIBRATION (FELT LIKE A RVIET GUN) THERE WAS NO AIRFRAME VIBRATION ASSOCIATED WITH IT. LASTED APPROX 2 MIN. MAINTENANCE REPORTS ACCOMPLISHED ALL STEPS OF EA 297571. (SEE SDR # AALA201908129020)