As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC PUMP DRIVE COUPLING SPRING INTERNAL SPLINES FAILED CAUSING DISENGAGEMENT OF HYD PUMP. RESULTING HYD FAILURE CAUSED UNPLANNED LANDING OF ACFT. NO DAMAGE OR INJURIES REPORTED. HIS DRIVE ASSEMBLY HAS BEEN THE SUBJECT OF NUMEROUS SB'S & AT LEAST ONE AD2007-06-15 IN THE PAST. THE SPLINES WERE INSPECTED & LUBED 33.1 HOURS PRIOR TO FAILURE. THE UNIT CONTAINS A SLL PN 704A33-651-206 BEARING WHICH WAS NOT AFFECTED OR DAMAGED.