What was found
(CAN) DURING ENGINE UPGRADE, COMPLETED AT ELLIOTT AVIATION CRS KX5R005N, IAW BLACKHAWK STC SA10737SE THE COMPRESSOR QUILL DRIVE SHAFT WAS NOT REPLACED BY SHAFT PN 117-910058-5 AS DETAILED IN BLACKHAWK DWG 06010001 REV B AND SB21-3303 R1. THE SHORTER -3 SHAFT EVENTUALLY FAILED TO ROTATE THE AIR CONDITIONING COMPRESSOR AS THE SPLINED TEETH WERE WORN AWAY DUE TO THE LACK OF PENETRATION INTO THE ACCESSORY GEAR INSIDE THE ACCESSORY GEARBOX.