What was found
AT 0203 EDST ON 7/21/2026 N505TJ LANDED UNEVENTFULLY ON TOP OF OISHEI CHILDREN'S HOSPITAL (1NY2) FOR PATIENT DELIVERY. AT APPROXIMATELY 0230 EDST, ENG1 WAS STARTED. AFTER STARTING ENG2, N505TJ LOST HYDRAULIC SYSTEM #2 BEFORE DEPARTURE TO KBUF. CREW REPORTED HEARING A GRINDING NOISE AND THE PILOT REPORTED SEEING THE #2 HYDRAULIC SYSTEM INDICATION TURN RED WITH AN ASSOCIATED MASTER WARNING INDICATION BEFORE IMMEDIATELY SHUTTING DOWN. AFTER SHUTDOWN, IT WAS NOTED THAT HYDRAULIC FLUID HAD COVERED THE RIGHT SIDE OF THE AIRCRAFT. THE DOM WAS CONTACTED AND HE RESPONDED FOR INVESTIGATION. THE AIRCRAFT REMAINED ON THE ROOFTOP UNTIL MAINTENANCE WAS DISPATCHED AT 0830 ON 7/21/2026 FOR REPAIR/RECOVERY. UPON INSPECTION, IT WAS DISCOVERED THAT AN O-RING P/N M83461/2-905 ON THE INBOARD PORT PLUG OF THE #2 INTEGRATED HYDRAULIC MODULE HAD BLOWN OUT AND CAUSED THE SUBSEQUENT LOSS OF HYDRAULIC FLUID IN THE #2 SYSTEM. THE O-RING WAS REPLACED AND THE #2 HYDRAULIC SYSTEM WAS SERVICED. A GROUND RUN WAS COMPLETED FOR LEAK CHECK AND THE AIRCRAFT DEPARTED 1NY2 FOR HOME BASE AT 1056 AND ARRIVED AT KBUF AT 1059. THE AIRCRAFT WAS REINSPECTED AND CLEANED UPON ARRIVAL. NO FURTHER DEFECTS WERE NOTED AT THAT TIME. AIRCRAFT HAS RETURNED TO SERVICE. THERE ARE CURRENTLY NO ASSOCIATED AD'S OR ASB'S.