Narrative:

I (pilot) failed to lower landing gear and proceeded to land with the gear up. This event occurred after the second leg of a short duration flight. The purpose of the flight was to determine and evaluate 2 minor squawks. Takeoff, flight, and landing were uneventful. The return leg was the same. Approaching 55J for landing, I determined the active runway from blind broadcasts from a lear jet preparing to depart runway 13. On downwind and base, I observed the lear's departure. I did a mental landing checklist. I did not use the physical checklists available to me in the aircraft. I know of no mechanical malfunction. I either skipped the landing gear item on my checklist, or if I did check, I did not proceed to lower the gear and confirm it. How it was discovered: sound of airframe impacting runway. The short duration flight and beautiful WX may have made my attitude more casual than it should have been. The beautiful low sun in the west and lear jet departing east out over the ocean may have interrupted or distraction me from my mental checklist. I have thoroughly discussed the event with a flight instructor. I will always use physical checklists in the future. I will always triple-check gear down. I became more involved in enjoying the view than attending to business at hand. In my opinion, the critical judgement error was reliance on memory and instinct. I made a decision not to use the laminated checklist laying in my lap. Factors affecting the quality of human performance: a short duration flight to evaluate the status of efforts to adjust minor mechanical deficiencies, resulting in a casual attitude.

Related reports:

Google
 

Original NASA ASRS Text

Title: A GA PVT PLT LANDS HIS ACFT WITH THE GEAR UP.

Narrative: I (PLT) FAILED TO LOWER LNDG GEAR AND PROCEEDED TO LAND WITH THE GEAR UP. THIS EVENT OCCURRED AFTER THE SECOND LEG OF A SHORT DURATION FLT. THE PURPOSE OF THE FLT WAS TO DETERMINE AND EVALUATE 2 MINOR SQUAWKS. TKOF, FLT, AND LNDG WERE UNEVENTFUL. THE RETURN LEG WAS THE SAME. APCHING 55J FOR LNDG, I DETERMINED THE ACTIVE RWY FROM BLIND BROADCASTS FROM A LEAR JET PREPARING TO DEPART RWY 13. ON DOWNWIND AND BASE, I OBSERVED THE LEAR'S DEP. I DID A MENTAL LNDG CHKLIST. I DID NOT USE THE PHYSICAL CHKLISTS AVAILABLE TO ME IN THE ACFT. I KNOW OF NO MECHANICAL MALFUNCTION. I EITHER SKIPPED THE LNDG GEAR ITEM ON MY CHKLIST, OR IF I DID CHK, I DID NOT PROCEED TO LOWER THE GEAR AND CONFIRM IT. HOW IT WAS DISCOVERED: SOUND OF AIRFRAME IMPACTING RWY. THE SHORT DURATION FLT AND BEAUTIFUL WX MAY HAVE MADE MY ATTITUDE MORE CASUAL THAN IT SHOULD HAVE BEEN. THE BEAUTIFUL LOW SUN IN THE W AND LEAR JET DEPARTING E OUT OVER THE OCEAN MAY HAVE INTERRUPTED OR DISTR ME FROM MY MENTAL CHKLIST. I HAVE THOROUGHLY DISCUSSED THE EVENT WITH A FLT INSTRUCTOR. I WILL ALWAYS USE PHYSICAL CHKLISTS IN THE FUTURE. I WILL ALWAYS TRIPLE-CHK GEAR DOWN. I BECAME MORE INVOLVED IN ENJOYING THE VIEW THAN ATTENDING TO BUSINESS AT HAND. IN MY OPINION, THE CRITICAL JUDGEMENT ERROR WAS RELIANCE ON MEMORY AND INSTINCT. I MADE A DECISION NOT TO USE THE LAMINATED CHKLIST LAYING IN MY LAP. FACTORS AFFECTING THE QUALITY OF HUMAN PERFORMANCE: A SHORT DURATION FLT TO EVALUATE THE STATUS OF EFFORTS TO ADJUST MINOR MECHANICAL DEFICIENCIES, RESULTING IN A CASUAL ATTITUDE.

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.