Narrative:

Moving aircraft from annual inspection to home base. Knowing the aircraft had just had annual I did a thorough preflight to include visual inspection of sight gauge for hydraulic fluid. It was dark and appeared full. Departed for short VFR flight to ZZZ upon arrival to the traffic pattern when I put the gear down I did not get green down light; so I cycled normal 3 times still no green light. I flew out of pattern and performed emergency extension procedures per the flight manual. At around 80 pumps the handle was hard and could not move either way. A visual check in mirror and out the window gear appeared down but still no green light. I then called the mechanic to see if he had any other ideas; having none; I tried manual pump handle again and got a few more pumps before handle went hard. Then I decided the switch may have slipped when they performed retraction test at annual. So gear appearing to be down I landed pumped gear a few more strokes until handle would not move for the last time. Landed at about 200 feet down the runway at slowest possible speed. Rolled 800-1000 feet. At around 20 kts main gear failed with a crosswind I slid from center of runway to just off left side maybe 100 ft.after aircraft recovery in the hangar I tried the hand pump with master on gear handle down and it's still locked hard without getting gear down light. At this point I shined a flashlight into sight gauge to discover a fifty year old plane has the glass stained and looked full on my preflight but could only see minimal fluid.have not had on jacks to verify my speculation yet. My new preflight practice will be to verify fluid/volume when coming out of maintenance by all means available.

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Original NASA ASRS Text

Title: C210 pilot reported that when he put the gear down he did not get green down light. The gear collapsed on landing.

Narrative: Moving aircraft from annual inspection to home base. Knowing the aircraft had just had annual I did a thorough preflight to include visual inspection of sight gauge for hydraulic fluid. It was dark and appeared full. Departed for short VFR flight to ZZZ upon arrival to the traffic pattern when I put the gear down I did not get green down light; so I cycled normal 3 times still no green light. I flew out of pattern and performed emergency extension procedures per the flight manual. At around 80 pumps the handle was hard and could not move either way. A visual check in mirror and out the window gear appeared down but still no green light. I then called the mechanic to see if he had any other ideas; having none; I tried manual pump handle again and got a few more pumps before handle went hard. Then I decided the switch may have slipped when they performed retraction test at annual. So gear appearing to be down I landed pumped gear a few more strokes until handle would not move for the last time. Landed at about 200 feet down the runway at slowest possible speed. Rolled 800-1000 feet. At around 20 kts main gear failed with a crosswind I slid from center of runway to just off left side maybe 100 ft.After aircraft recovery in the hangar I tried the hand pump with master on gear handle down and it's still locked hard without getting gear down light. At this point I shined a flashlight into sight gauge to discover a fifty year old plane has the glass stained and looked full on my preflight but could only see minimal fluid.Have not had on jacks to verify my speculation yet. My new preflight practice will be to verify fluid/volume when coming out of maintenance by all means available.

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.