As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NAS1612-6, O-RING LOCATED ON AN814-6K, PLUG INSTALLED IN (A) HYDRAULIC SYSTEM MANIFOLD, PN 6717277-3 FAILED, CAUSING LOSS OF SYSTEM (A) HYDRAULIC FLUID AND SUBSEQUENT PILOT SHUTDOWN OF (A) HYDRAULIC SYSTEM. FOUND TORQUE ON PLUG TO BE LESS THAN 30 INCH POUNDS ALLOWING HYDRAULIC FLUID UNDER PRESSURE TO DAMAGE O-RING. NO PROVISIONS FOR SAFTEYING THE PLUG ARE PROVIDED. RECOMMEND A DRILLED HEAD PLUG BE INSTALLED AND PROPERLY SAFETIED TO PREVENT LOSS OF TORQUE ON PLUG. (K)