Sail Plane
Air Traffic Control Fully Certified; Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Air Traffic Control Military 3; Air Traffic Control Radar 26; Flight Crew Last 90 Days 42; Flight Crew Total 2100; Flight Crew Type 164
Workload; Distraction
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Gear Up Landing
Aircraft Aircraft Damaged
Human Factors; Procedure; Aircraft
Motorglider entered pattern on 45. On 45 I began checklist USTALL; Undercarriage; Switch; Trim; Airbrake; Look; Land as used in pure gliders. The student has [a condition] but drives and is high functioning. His characteristic that distracted me in doing the checklist was making requests. I had just discussed the first landing checklist item of undercarriage when he requested to land engine-off. The gear did not get put down and I began procedure for engine off by setting timer for the prescribed 1 minute at 3;000 RPM but when shutting off magnetos; magneto A did not respond so engine continued running despite magneto A being in OFF position and throttle at idle. Therefore unable to feather prop in horizontal position.Student made another request that he fly final to landing and the gear alarm was not recognized. The gear alarm activates when gear is up and spoiler is unlocked. The gear alarm was only heard upon exiting the aircraft after skidding 150 feet. Checklist was on my lap.Recommendation is to help Instructors deal with [certain conditions] with more information dissemination of appropriate sorts.
A motorglider pilot reported that due to distraction the landing gear was never deployed during landing.