ORLANDO, FL, USA
N777BK
CESSNA 210L
FLIGHT WAS UNABLE TO GET SAFE INDICATION FOR LANDING GEAR EXTENDED WHILE APPROACHING DESTINATION AIRPORT. FLIGHT RETURNED TO DEPARTURE AIRPORT. AFTER ACCOMPLISHING EMERGENCY PROCEDURES FOR GEAR EXTENSION, GEAR SAFE INDICATION WAS STILL NOT OBTAINED. PILOT DETERMINED ALL HYDRAULIC FLUID HAD BEEN LOST. FLIGHT WAS LANDED WITH THE NOSE GEAR LOCKED AND THE MAIN GEARS PARTIALLY EXTENDED. POSTLANDING EXAMINATION REVEALED RIGHT MAIN GEAR HYDRAULIC ACTUATOR HAD FAILED DUE TO OVERSTRESS ALONG METAL GRAIN BOUNDARIES AND AT AREA OF LOW WALL THICKNESS. ALL HYDRAULIC SYSTEM PRESSURE WERE FOUND TO BE NORMAL AND NO OTHER LANDING GEAR SYSTEM FAILURES WERE FOUND. AFTER FAILURE OF THE GEAR ACTUATOR ALL NORMAL AND EMERGENCY SYSTEM FLUID WAS LOST THROUGH THE ACTUATOR.
FAILURE OF THE RIGHT MAIN LANDING GEAR ACTUATOR DUE TO OVERSTRESS FOR UNDETERMINED REASONS WHICH RESULTED IN LOSS OF ALL LANDING GEAR SYSTEM HYDRAULIC FLUID WHICH IN TURN RESULTED IN THE PILOT BEING UNABLE TO EXTEND AND LOCK THE LANDING GEAR.
Source: NTSB Aviation Accident Database
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