What was found
LOUD AND VIOLENT VIBRATION IN AIRFRAME STARTING AT 220KTS WHILE RETRACTING SLATS. FELT AS IF IT WAS UNDER CAPTINS SEAT. VIBRATION STOPPED AFTER SLOWING BELOW 220KIAS AND DID NOT RETURN. ONCE LEVELED OFF AND SLOWED TO 190 VIBRATION WAS NOT PRESENT FOR REMAINDER OF FLIGHT, RETURNED AND LANDED WITHOUT INCIDENT. INSPECTED PACK INLETS, FOUND DEFLECTOR FAIRING ON NR 2 PACK BROKE AT ATTACH POINTS AND HANGING IN AIRSTREAM R & R FAIRING ASSY REF MM 21-55-01-4-2. OPS CHECK GOOD NO DEFECTS NOTED.