What was found
UPON DECENT FROM CRUISE A SHUDDER WAS DETECTED WHEN THE POWER LEVERS WERE RETARDED. FLIGHT CREW WAS ABLE TO DETERMINE IT WAS THE RT ENG CAUSING THE SHUDDER. ALL ENG PARAMETERS WERE NORMAL, AS SAFE LANDING WAS MADE. INVESTIGATION RESULTED IN THE DISCOVERY OF THE AFT ACCESSORY GEAR BOX BOLTS MISSING NUTS & WASHERS & THE INBD BOLT HAD SLID ALMOST ALL THE WAY OUT. NEW NUTS & WASHERS WERE INSTALLED & PROPERLY TORQUED. A SATISFACTORY FLIGHT TEST WAS THEN COMPLETED. THE ENG HAD RECENTLY BEEN DISASSEMBLED FOR A LIGHTNING INSPECTION BY THE MFG, IT IS BELIEVED THAT THE INSTALLATION OF THESE TWO NUTS WERE NEGLECTED AT THAT TIME.