Accident Description
The pilot reported practicing a simulated engine-out visual approach to the asphalt runway. On short final, he extended the landing gear and believed it was down and locked. However, after touchdown, both the left and right main landing gear retracted into their respective wheel-wells. A witness at the airport observed that the airplane's main landing gear was not fully extended when the airplane touched down on the runway.
The pilot stated that he did not hear the aural landing gear warning horn prior to landing and did not recall if the green landing gear position indicator lights were illuminated before touchdown. The airplane sustained substantial damage to the right horizontal stabilizer.
Postaccident Examination
Initial postaccident examination of the airplane included a check of the landing gear warning system and a landing gear retraction test, revealing no anomalies. Subsequent additional examination involved multiple landing gear extension-retraction cycles, which revealed a faulty hydraulic power pack contactor. This fault resulted in intermittent extension of the landing gear.
Checklist Item
Review of the airplane's pilot operating handbook, normal procedures, before landing checklist included: "4. Landing Gear – CHECK (observe main gear down and green indicator light on)."