Incident Details
The airplane touched down with its landing gear retracted. The pilot had initiated a go-around on the first approach because the runway was not clear, and subsequently forgot that he had raised the landing gear during that maneuver.
Pilot's Statement
The pilot reported that he was wearing a new noise-attenuating headset, which altered the sounds he normally hears while flying. He stated that he did not recognize the gear warning horn during the accident landing, but recalled that the horn was still sounding as he removed his headset after touchdown.
Equipment
The headset, described as a new noise-attenuating model, changed the acoustic environment for the pilot. The pilot indicated that the unfamiliar sounds may have contributed to his failure to recognize the gear warning horn.