Narrative:

On may/mon/93, I piloted an small aircraft twin, registration number nx. On this day, I performed a thorough preflight inspection of the aircraft, with emphasis on the gear and its components (which obviously included all bolts) and found everything to be safe for flight. The entire flight was conducted in an airport traffic pattern. Just seconds (perhaps 2 or 3) after touchdown, I experienced vibration from the right side of the aircraft. Fearing a tire blowout, I immediately decelerated the aircraft on the runway. When clearing the runway, I again felt vibration which immediately prompted me to shut down with engines to prevent damage to them in case of a gear collapse. I deplaned to find the right main gear trailing scissor bolt failed. Other damage included another bolt failure (same main) and a tear of metal in the gear well. I quickly got assistance from a mechanic to tow the aircraft to a hangar. The following morning I spoke with mr. Y (airworthiness inspector) at the orlando, fl, FSDO. I explained the occurrence in detail to be clear on NTSB reporting requirements. Mr. Y told me that failure of the scissor bolt caused the subsequent damage and that the occurrence was not considered an accident nor a rptable incident. I feel it is important for me to state that the landing was by no means a 'hard landing.' everything went well throughout the entire flight with the exception of the failure of that scissor bolt.

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Original NASA ASRS Text

Title: THE R MAIN GEAR TRAILING SCISSOR BOLT FAILED ON AN SMA TWIN CAUSING CONSIDERABLE DAMAGE.

Narrative: ON MAY/MON/93, I PILOTED AN SMA TWIN, REGISTRATION NUMBER NX. ON THIS DAY, I PERFORMED A THOROUGH PREFLT INSPECTION OF THE ACFT, WITH EMPHASIS ON THE GEAR AND ITS COMPONENTS (WHICH OBVIOUSLY INCLUDED ALL BOLTS) AND FOUND EVERYTHING TO BE SAFE FOR FLT. THE ENTIRE FLT WAS CONDUCTED IN AN ARPT TFC PATTERN. JUST SECONDS (PERHAPS 2 OR 3) AFTER TOUCHDOWN, I EXPERIENCED VIBRATION FROM THE R SIDE OF THE ACFT. FEARING A TIRE BLOWOUT, I IMMEDIATELY DECELERATED THE ACFT ON THE RWY. WHEN CLRING THE RWY, I AGAIN FELT VIBRATION WHICH IMMEDIATELY PROMPTED ME TO SHUT DOWN WITH ENGS TO PREVENT DAMAGE TO THEM IN CASE OF A GEAR COLLAPSE. I DEPLANED TO FIND THE R MAIN GEAR TRAILING SCISSOR BOLT FAILED. OTHER DAMAGE INCLUDED ANOTHER BOLT FAILURE (SAME MAIN) AND A TEAR OF METAL IN THE GEAR WELL. I QUICKLY GOT ASSISTANCE FROM A MECH TO TOW THE ACFT TO A HANGAR. THE FOLLOWING MORNING I SPOKE WITH MR. Y (AIRWORTHINESS INSPECTOR) AT THE ORLANDO, FL, FSDO. I EXPLAINED THE OCCURRENCE IN DETAIL TO BE CLR ON NTSB RPTING REQUIREMENTS. MR. Y TOLD ME THAT FAILURE OF THE SCISSOR BOLT CAUSED THE SUBSEQUENT DAMAGE AND THAT THE OCCURRENCE WAS NOT CONSIDERED AN ACCIDENT NOR A RPTABLE INCIDENT. I FEEL IT IS IMPORTANT FOR ME TO STATE THAT THE LNDG WAS BY NO MEANS A 'HARD LNDG.' EVERYTHING WENT WELL THROUGHOUT THE ENTIRE FLT WITH THE EXCEPTION OF THE FAILURE OF THAT SCISSOR BOLT.

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.