What was found
AFTER THE PILOT REPORTED UNUSUAL TAILBOOM MOVEMENT DURING HIS PREFLIGHT IHSPECTION , ONE OF OUR MECHANICS REMOVE THE TAILBOOM ATTACHMENT FAIRING. HE FOUND THE RT UPPER TAILBOOM ATTACH BOLT HAD FRACTURED , AND THE BOLT HEAD WAS HELD ONLY BY SAFETY WIRE.WE THEN REMOVED THE RIVETED CLOSURE COVERING THE NUTPLATE AND ATTACH FITTING. WE FOUND FITTING, P/N 500N3422,CRACKED AND ANGLE P/N 500N3129-6 ,ALSO CRACKED. WE HAVE GROUNDED ALL 3 OF OUR 600N MODELS , AND HAVE FOUND CRACKS ON ALL 3 ANGLES .