Incident Overview
During a flight intended to demonstrate an approach-to-landing stall, the landing gear was extended as part of the maneuver. However, the crew received no safe indication that the gear was locked. The gear was recycled, but the nose gear would not extend. All attempts to extend the nose gear, including the use of the emergency extension hand pump, were unsuccessful.
Diversion and Landing
The instructor pilot decided to divert to Fresno Air Terminal, where fire and maintenance personnel were available. Upon arrival, the aircraft executed a gear-up landing.
Investigation Findings
Post-incident investigation revealed that a bolt came into contact with the nose wheel extension mechanism, preventing it from extending. The bolt was securing the propeller governor cable in the nosewheel well area.