Incident Overview
A flight instructor in a multi-engine, retractable landing gear-equipped airplane reported that the pilot receiving instruction was on the controls during landing. The student pilot had been feeling fatigue and motion sickness due to light turbulence encountered in the traffic pattern. During their discussion of these factors, both pilots became distracted and failed to complete the landing checklist. Consequently, the airplane was not configured for landing, and the landing gear remained retracted when the airplane touched down.
Damage Assessment
The airplane sustained substantial damage to both engine gear boxes as a result of the gear-up landing. The flight instructor noted that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.
Contributing Factors
The distraction caused by the discussion regarding the student's fatigue and motion sickness led to the omission of the landing checklist and failure to extend the landing gear. No other factors were reported.