What was found
NR 3 ENG FLAMEOUT. WHEN THE AGB COVER WAS REMOVED, THE TOWERSHAFT & TOWERSHAFT RETAINING RING FELL OUT. IT WAS CONCLUDED THAT THE TOWERSHAFT RETAINING RING WAS ONLY PARTIALLY ENGAGED IN THE TOWERSHAFT'S MATING GROOVE AT INSTALLATION. IN TIME, THIS ALLOWED THE TOWERSHAFT TO SLIP DOWNWARD. THIS RESULTED IN ITS LOWER TEETH DISENGAGING FROM THE AGB GEARS. THEREFORE, ALTHOUGH THE TOWERSHAFT WAS STILL SPINNING, NO TORQUE WAS BEING TRANSMITTED TO THE MGB. JICS HAVE BEEN REVISED TO ALERT MECHANICS & LEADS TO THIS POSSIBILITY.