What was found
THE AS RECEIVED EXAMINATION OF THE ENGINE SHOWED METALLIC FLAKES ON THE TURBOMACHINE CHIP COLLECTOR. THE HAND ROTATION OF HIGH PRESSURE (HP) REVEALED A DISCONTINUITY FROM THE ACCESSORY GEARBOX (AGB). THE AGB ANGLE DRIVE COVER WAS REMOVED AND THE TOWERSHAFT WAS FOUND FRACTURED. THE TOWERSHAFT HAD FRACTURED BELOW THE SPLINES AND THE SURFACES SHOWED SMEARING AND CORROSION. THE FRACTURE SURFACE SHOWED A FLAT TOPOGRAPHY INDICATION OF FATIGUE PROPAGATION. THE TOWERSHAFT SPIGOT FITS MATING WITH THE SPIRAL GEAR WEAR FOUND WORN. MAJOR PART AFFECTED (PRIMARY DISTRESS) P/N: 3111968-01 S/N: 50D536 DESCRIPTION: TOWERSHAFT CONDITION: FRACTURED.