NTSB Factual Report

The pilot stated that he entered the airport's traffic pattern for landing and landed the airplane with the landing gear retracted. He said that he did not use a landing checklist, and that he was wearing a noise cancelling headset and did not hear the landing gear caution horn when he reduced the throttle for landing. The bottom of the airplane sustained structural damage requiring the replacement of several bulkheads and associated stringers, as well as a significant area of skin.

NTSB Probable Cause

The pilot's failure to lower the landing gear prior to landing.