Narrative:

On a local post annual inspection flight in my cessna 210B I experienced a failure to retract in the gear system. The wheels appeared to be in; but the gear doors would not close. The checklist calls for lowering the gear and after obtaining a 'green light'; to return and land. I put the gear handle in the down position and the gear unlocked and fell out of the wheel wells but would not extend. Again; following the checklist I extended the emergency gear handle and attempted to extend the gear manually. After numerous attempts to pump the gear down over 1 1/2 hours I had what appeared to be a nose gear extended but not the mains. This aircraft has hydraulic flaps as well that use the same engine driven pump. The flaps operated normally and the reservoir was full. Analyzing the situation I determined that no amount of pumping would get the gear down and locked if it wouldn't operate on the fully functioning engine driven pump. I exhausted all the options listed in the checklist including cycling the gear numerous times to no avail.at this point with about one hour of fuel remaining I requested and received special handling from tower. I made one pass to allow tower personnel to inspect the gear from the outside. They confirmed that the mains were not fully extended.after one last attempt to pump the gear down I elected to retract the nose wheel and land gear up. On the second pass I touched down on centerline approximately 1500 ft from the approach end. The aircraft slid approximately 400 ft and came to rest straight ahead about 35 ft right of centerline. The winds were from the left. The aircraft sustained minimal damage and after jacking it up and extending the gear by hand it was towed to the ramp and secured. The ATC personnel were professional and helpful. The ground rescue personnel were also professional and well trained. We are still looking into the cause of the gear failure but current speculation is a fault with the gear selector valve on the hydraulic power pack.

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Original NASA ASRS Text

Title: Cessna 210B pilot reported landing with the gear up after all efforts to extend the gear failed.

Narrative: On a local post annual inspection flight in my Cessna 210B I experienced a failure to retract in the gear system. The wheels appeared to be in; but the gear doors would not close. The checklist calls for lowering the gear and after obtaining a 'green light'; to return and land. I put the gear handle in the down position and the gear unlocked and fell out of the wheel wells but would not extend. Again; following the checklist I extended the emergency gear handle and attempted to extend the gear manually. After numerous attempts to pump the gear down over 1 1/2 hours I had what appeared to be a nose gear extended but not the mains. This aircraft has hydraulic flaps as well that use the same engine driven pump. The flaps operated normally and the reservoir was full. Analyzing the situation I determined that no amount of pumping would get the gear down and locked if it wouldn't operate on the fully functioning engine driven pump. I exhausted all the options listed in the checklist including cycling the gear numerous times to no avail.At this point with about one hour of fuel remaining I requested and received special handling from Tower. I made one pass to allow Tower personnel to inspect the gear from the outside. They confirmed that the mains were not fully extended.After one last attempt to pump the gear down I elected to retract the nose wheel and land gear up. On the second pass I touched down on centerline approximately 1500 ft from the approach end. The aircraft slid approximately 400 ft and came to rest straight ahead about 35 ft right of centerline. The winds were from the left. The aircraft sustained minimal damage and after jacking it up and extending the gear by hand it was towed to the ramp and secured. The ATC personnel were professional and helpful. The ground rescue personnel were also professional and well trained. We are still looking into the cause of the gear failure but current speculation is a fault with the gear selector valve on the hydraulic power pack.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.