Narrative:

I had been using my checklist. My student in left seat attempted to lower gear. The selector switch was placed from up to the neutral position. I neglected to verify gear down and locked. The switch should have been in the down position! I became distracted and failed to extend the landing gear on an small aircraft sel. Little damage occurred to the airframe. The propeller must be replaced. I realize the gross error in my ways and will strive to never let this occur again. I landed on the center of the runway in bastrop, la. There were no injuries.

Related reports:

Google
 

Original NASA ASRS Text

Title: SMA SEL ACFT ON A TRAINING FLT LANDED 'GEAR UP' DUE TO THE INSTRUCTOR NOT VERIFYING 'GEAR DOWN' PRIOR TO LNDG.

Narrative: I HAD BEEN USING MY CHKLIST. MY STUDENT IN L SEAT ATTEMPTED TO LOWER GEAR. THE SELECTOR SWITCH WAS PLACED FROM UP TO THE NEUTRAL POS. I NEGLECTED TO VERIFY GEAR DOWN AND LOCKED. THE SWITCH SHOULD HAVE BEEN IN THE DOWN POS! I BECAME DISTRACTED AND FAILED TO EXTEND THE LNDG GEAR ON AN SMA SEL. LITTLE DAMAGE OCCURRED TO THE AIRFRAME. THE PROP MUST BE REPLACED. I REALIZE THE GROSS ERROR IN MY WAYS AND WILL STRIVE TO NEVER LET THIS OCCUR AGAIN. I LANDED ON THE CTR OF THE RWY IN BASTROP, LA. THERE WERE NO INJURIES.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.