What was found
VIBRATION FELT IN FLOOR & YOKE STARTING AT FL180, 250 KNOTS. AT CRUISE FL 410 & 410 LESS VIBRATION. R & R RUDDER TRIM TAB ACTUATOR & NLG SPADE DOOR HARDWARE. SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. ACFT WAS RTS.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
VIBRATION FELT IN FLOOR & YOKE STARTING AT FL180, 250 KNOTS. AT CRUISE FL 410 & 410 LESS VIBRATION. R & R RUDDER TRIM TAB ACTUATOR & NLG SPADE DOOR HARDWARE. SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. ACFT WAS RTS.