What was found
HARMONIC VIBRATION LASTED FOR 1 MIN WENT AWAY FOR 10 SECONDS & THEN CAME BACK. VIBRATION WAS WORSE AT HIGHER SPEEDS, LEAST AT 290 KNOTS & BELOW. VIBRATION FREQUENCY WAS MEDIUM & ENTIRE AIRFRAME WAS SHAKING. DID NOT FEEL VIBE IN CONTROL COLUMN, NOR THROTTLES OR RUDDER PEDALS, VIBRATION INTENSITY WAS MILD TO MODERATE. DURING INSPECTION OF FAIRINGS WITH FLAPS & SLATS UP, FOUND RT NR 2 FAIRING WITH EXCESSIVE PLAY COMPARED TO OTHERS. DROPPED FLAPS TO INVESTIGATE & FOUND RT NR 2 OTBD FAIRING ROD & LEVER WITH EXCESSIVE PLAY. DURING COMPARING NR 2 RT WITH LT NR 2, FOUND LT NR 2 MISSING RETAINING BOLT, 2 SLEEVES, 2 WASHERS, NUT & COTTER PIN, REF IPC 27-51-51-03 ITEMS 10 - 50.