What was found
DURING APPROACH TO CLT, AIRCRAFT EXPERIENCED A SIGNIFICANT VIBRATION WITH FLAP 23 SELECTED. MAINTENANCE INSPECTED THE AIRCRAFT FLIGHT CONTROL SYSTEMS, LANDING GEAR SYSTEMS, WINGS, AND FUSELAGE WITH NO CAUSE FOUND. A SUBSEQUENT TEST FLIGHT WAS ACCOMPLOSHED WITH NO FINDINGS OR PROBLEMS REPORTED. THE AIRCRAFT RETURNED TO SERVICE. (M)