Narrative:

I landed my small aircraft with the landing gear retracted. I entered the traffic pattern a little too fast to lower the gear at my usual position on the downwind leg. I became distracted watching for a student pilot who was flying ahead of me. When I looked down to check my speed, I momentarily lost him and once I found him, I have too much of my attention to watching out for him. I thought I had slowed down and dropped the gear. Being this distracted, I neglected to go through my usual procedure and didn't use my normal gump procedure. I lowered my flaps and proceeded down the final approach. I didn't hear the warning horn, and obviously didn't look at the lights or indicator. I was unaware of my mistake until the propeller hit the ground (runway). Recurrent training should emphasize the use of the checklist and a final check of all system as the turn is made onto final. One should never allow his attention to be diverted so as to neglect the final check. I will place a placard in a very obvious place and will suggest to all my pilot friends that they do likewise. One is never too experienced to use a checklist.

Google
 

Original NASA ASRS Text

Title: GEAR UP LNDG IN SINGLE SMA.

Narrative: I LANDED MY SMA WITH THE LNDG GEAR RETRACTED. I ENTERED THE TFC PATTERN A LITTLE TOO FAST TO LOWER THE GEAR AT MY USUAL POS ON THE DOWNWIND LEG. I BECAME DISTRACTED WATCHING FOR A STUDENT PLT WHO WAS FLYING AHEAD OF ME. WHEN I LOOKED DOWN TO CHK MY SPD, I MOMENTARILY LOST HIM AND ONCE I FOUND HIM, I HAVE TOO MUCH OF MY ATTN TO WATCHING OUT FOR HIM. I THOUGHT I HAD SLOWED DOWN AND DROPPED THE GEAR. BEING THIS DISTRACTED, I NEGLECTED TO GO THROUGH MY USUAL PROC AND DIDN'T USE MY NORMAL GUMP PROC. I LOWERED MY FLAPS AND PROCEEDED DOWN THE FINAL APCH. I DIDN'T HEAR THE WARNING HORN, AND OBVIOUSLY DIDN'T LOOK AT THE LIGHTS OR INDICATOR. I WAS UNAWARE OF MY MISTAKE UNTIL THE PROP HIT THE GND (RWY). RECURRENT TRAINING SHOULD EMPHASIZE THE USE OF THE CHKLIST AND A FINAL CHK OF ALL SYS AS THE TURN IS MADE ONTO FINAL. ONE SHOULD NEVER ALLOW HIS ATTN TO BE DIVERTED SO AS TO NEGLECT THE FINAL CHK. I WILL PLACE A PLACARD IN A VERY OBVIOUS PLACE AND WILL SUGGEST TO ALL MY PLT FRIENDS THAT THEY DO LIKEWISE. ONE IS NEVER TOO EXPERIENCED TO USE A CHKLIST.

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.