Date: 201204
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: 15
Aircraft: Cessna 210 Centurion / Turbo Centurion 210C; 210D
Operator: Personal
Operating under: Part 91
Flight plan: IFR
Mission: Personal
Flight phase: Landing
Airspace: Class G ZZZ
ATC / advisory: UNICOM ZZZ
Aircraft component: Gear Extend/Retract Mechanism
Component problem: Failed
Reporter organization: Personal
Reporter function: Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Instrument; Flight Crew Private
Human factors: Human-Machine Interface; Troubleshooting; Time Pressure
Anomaly: Aircraft Equipment Problem Critical; Ground Excursion Runway
Detector: Person Flight Crew
When detected: In-flight
Result: Aircraft Aircraft Damaged; Flight Crew Inflight Shutdown; General Declared Emergency; General Evacuated
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: I entered left downwind for the runway; extended one notch of flap and activated the gear down switch at 100 KTS. The main gear came out and dropped down but did not rotate forward into the down and locked position. The nose gear was out.I extended the downwind and recycled the gear. The mains fully retracted but on extension only came out partially again. I then retracted gear and went to manual extension. Manual pump with power pack off would pump nose gear out only; mains remained in the plane. I tried this manual procedure 5 more times and called a mechanic on the field who advised that fluid might be out of the hydraulic unit. I climbed to 4;000 FT; set auto pilot and climbed back to the luggage compartment to get a quart of engine oil. Pulled open the access panel and attempted to add oil with a flashlight but the power unit was almost full. I then retracted the gear completely and tried the hand pump three more times with the same result. Finally I tried unusual attitudes to try and swing gear forward into locked position with no luck.I then planned for a partial gear landing and had ground personnel call the Fire Department and warn off any approaching planes and circled in slow flight for 10 more minutes waiting for trucks to arrive. On a half mile final with full flaps I turned off the engine and closed the fuel selector with approximately four gallons of remaining fuel. There were no VASI lights available.I touched down five feet left of center line; skidded about 110 yards; veered left onto the grass for another 300 FT and finally stopped with the aircraft leaning over gently. There was no belly damage but the horizontal stabilizer had a slight bend on left side. I suffered no injuries and was the only soul on board. A crane arrived in an hour and lifted the plane some six feet off its belly in a sling. Men on each side of the plane kept wings level while the main gear were pulled around to their proper extended position and the plane was set back on its main gear; pulled to the runway and returned to its hangar.




Synopsis: Unable to completely extend the main gear despite repeated attempts the pilot of a C210L landed with only the nose gear extended and ran off the side of the runway. The aircraft suffered minor damage.