As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) LH MAIN LANDING GEAR COULD NOT BE EXTENDED. THE FAULT WAS TRACED TO A BROKEN ACTUATOR PISTON/RACK. BREAK OCCURRED IN THE RACK AREA TWO TEETH IN FROM THE END AND ORIGINATING AT THE BASE OF THESECOND TOOTH. THE CRACK FACE SHOWS EVIDENCE OF BEACH MARKS' INDICATING A FATIGUE FAILURE. SMOKE WAS ALSO REPORTED IN THE COCKPIT PRIOR TO LANDING FOLLOWING ATTEMPTS TO EXTEND GEAR. REASON STILL TO BE ESTABLISHED.