Narrative:

I was the flight instructor on a dual training lesson in a piper seminole. My student was executing a single engine approach (NDB 31 dvl) at devils lake. I told him to remove the foggles at 200 ft above MDA and do his final check. He didn't do the final check and I started to do it. Mixtures rich, propellers full forward. I told him he had the second throttle for a go around if needed. At that point, I always check the gear to make sure it's down and locked. However, I was distraction by the displaced threshold, which I knew was there but didn't know if my student realized it or not. From that point on, I don't remember hearing the gear warning horn or checking the gear. We landed gear up. I think this could have been prevented if I would have included in my prebrief with my student the fact that runway 31 at devils lake has a displaced threshold and if I wouldn't have broken the sterile cockpit rule at such a critical phase of the flight.

Google
 

Original NASA ASRS Text

Title: AN INSTRUCTOR PLT RPT OF A GEAR UP LNDG DURING A SIMULATED 1 ENG INOP NDB APCH TO DVL, ND.

Narrative: I WAS THE FLT INSTRUCTOR ON A DUAL TRAINING LESSON IN A PIPER SEMINOLE. MY STUDENT WAS EXECUTING A SINGLE ENG APCH (NDB 31 DVL) AT DEVILS LAKE. I TOLD HIM TO REMOVE THE FOGGLES AT 200 FT ABOVE MDA AND DO HIS FINAL CHK. HE DIDN'T DO THE FINAL CHK AND I STARTED TO DO IT. MIXTURES RICH, PROPS FULL FORWARD. I TOLD HIM HE HAD THE SECOND THROTTLE FOR A GAR IF NEEDED. AT THAT POINT, I ALWAYS CHK THE GEAR TO MAKE SURE IT'S DOWN AND LOCKED. HOWEVER, I WAS DISTR BY THE DISPLACED THRESHOLD, WHICH I KNEW WAS THERE BUT DIDN'T KNOW IF MY STUDENT REALIZED IT OR NOT. FROM THAT POINT ON, I DON'T REMEMBER HEARING THE GEAR WARNING HORN OR CHKING THE GEAR. WE LANDED GEAR UP. I THINK THIS COULD HAVE BEEN PREVENTED IF I WOULD HAVE INCLUDED IN MY PREBRIEF WITH MY STUDENT THE FACT THAT RWY 31 AT DEVILS LAKE HAS A DISPLACED THRESHOLD AND IF I WOULDN'T HAVE BROKEN THE STERILE COCKPIT RULE AT SUCH A CRITICAL PHASE OF THE FLT.

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.