As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH TO LANDING, HYDRAULIC PRESSURE WAS NOTED TO BE ZERO. LANDING GEAR WAS EXTENDED USING EMERGENCY AIR SYSTEM AND A NORMAL LANDING WAS MADE. EXAMINATION REVEALED A O-RING RETAINING JAMB NUT ON THE MAIN GEAR ACTUATOR HAD BACKED OFF CAUSING A HYDRAULIC LEAK. LEAK WAS REPAIRED, SYSTEM TESTED AND SERVICED. RECOMMEND THOROUGH INSPECTION OF LANDING GEAR ACTUATOR JAMB NUTS. (X)