Incident Overview
The pilot reported conducting a normal approach to Runway 12. During the landing rollout, as the nose of the aircraft touched down, the nose gear assembly folded, causing the aircraft to slide to a stop.
Post-Crash Examination
A post-crash examination of the aircraft disclosed that the green light for the nose gear remained illuminated regardless of the landing gear position. This anomaly was traced to a broken lead wire on the #5 pole of the nose landing gear position micro switch. This micro switch serves a dual function: it activates the green indicator light and also controls the hydraulic pressure that holds the gear in the locked position.
Findings
Due to the broken lead wire, the micro switch failed to properly sense the gear position. Consequently, the pilot received a down-and-locked indication even though the nose gear was not actually locked in the down position. The absence of hydraulic pressure to secure the gear allowed it to fold upon touchdown.