What was found
FUSELAGE STRUCTURE: ENCOUNTERED SEVERE TURBULANCE OVER KLIT AT FL390, CLEAN CONFUGURATION, M.75. AIRCRAFT DROPPED MAYBE 20' IN 1/2 SECOND, NO ROLLING MOTION. ALL OCCUPANTS SEATED AND BELTED AT THE TIME SO NO INJURIES, A FEW CABIN ITEMS AND PERSONAL ITEMS TOSSED AROUND CABIN. NO AIRFRAME DAMAGE SUSPECTED. CORRECTIVE ACTION: PERFORMED SEVERE TURBULENCE INSPECTION. NO RELEVANT FINDINGS. IAW CE680A AMM 05-50-00.