Incident Summary
A pilot reported that after takeoff, the flight proceeded to the destination airport. The pilot lowered the landing gear and visually verified that all three gears were down and locked using a mirror. The landing was described as "firm but not a hard landing." As the nose lowered, the pilot heard the propeller contact the runway.
Post-Accident Inspection
Post-accident testing of the landing gear retraction and extension systems revealed no discrepancies. The down switches and warning horn operated normally. Disassembly of the nose gear down lock mechanism showed no discrepancies. The hydraulic reservoir was full, and there was no evidence of hydraulic fluid leakage or structural failure of the nose landing gear.
Findings
Slight movement between the two down lock hooks was noted, but no locking or binding was observed. The electrical strip at the top of the nose landing gear, where the down switch wires connect, was found to be oily and dirty. A protective rubber cover contained a small amount of oil and dirt. No other anomalies were identified.