What was found
AIRFRAME VIBRATION. RTFL. AT FL 240 AND 320 KTS FELT VIBRATION IN FLOOR & THRU RUDDER PEDALS, FLT ATTENDANTS ALSO FELT VIBRATION. SLOWED TO 270KTS & VIB STARTED TO DIMINISH & AT AROUND 250 KTS VIBRATION CEASED, NO FURTHER PROBLEMS DURING DESCENT. FOUND TAPE LOOSE & MISSING FROM WING BELLY FAIRINGS 192DT & 191DT. RE-APPLIED SPEED TAPE. VIBRATION REPEATED - FELT IN RUDDER PEDALS & FLOOR IN CLIMB AT FL280 & 310 KTS-.77. LOOSE MOUNT POINT-NOSE GEAR AFT AERODYNAMIC DOOR-LOWER LEFT BOLT WORKING & LOOSE. FOUND JAM NUTS LOOSE ON ROD ENDS & HOLE IN SUPPORT ASSY. REPLACED SUPPORT ASSY & CHECKED ROD END JAM NUTS & TIGHTENED AS NEEDED. NO ROD ADJUSTMENTS MADE.