What was found
CONTINUOUS MODERATE AIRFRAME VIBRATION WHEN ABOVE FLIGHT LEVEL 200 AND 250 KIAS. EMERGENCY DECLARED. RETURNED TO LAX. SUSPECT ALL-SPEED AILERONS. PERFORMED ADJUSTMENTS ON BOTH ALL-SPEED AILERONS IAW 27-10-00. GROUND OPS CHECKED GOOD AT THIS TIME. RT FUEL JETTISON VALVE FAILED TO OPEN ON PRIMARY SYSTEM. VALVE OPENED USING SECONDARY SYSTEM. CHECKED PER M/M 28-31-00. NO DEFECTS NOTED. OK FOR SERVICE. OVERWEIGHT LANDING AT 298,000 LBS. PERFORMED OVERWEIGHT LANDING INSPECTION IAW MM 05-51-11. NO DEFECTS NOTED.