Background
A pilot was conducting an instrument landing system (ILS) approach for a medical life-flight. The approach was performed in dark night conditions with a cloud layer present. The pilot reported no pre-impact mechanical malfunctions or failures that would have precluded normal operation.
Sequence of Events
During the approach, the pilot experienced difficulty maintaining the airplane on the localizer and glide path. As the aircraft descended through 800 to 900 feet above ground level, it exited the cloud layer, but the pilot still had trouble locating the runway in the darkness. During the landing flare, the pilot reduced throttle, and upon touchdown on the runway surface, realized the landing gear was retracted. The pilot did not hear any warning horns.
Pilot's Account
The pilot recalled that when selecting the landing gear, he may have placed the handle in the neutral position rather than keeping his hand on the lever and waiting for three green lights to confirm gear extension. He stated he did not follow his normal checklists due to the demands of the ILS approach. Additionally, he cited several stressors in his personal life that may have been distracting, including a recent change of airplanes and having performed few ILS approaches in the preceding six months.
The accident resulted in substantial damage to the lower fuselage and engine mounts.