Right gear collapses on small aircraft twin during training in progress, landing.

Attributes
ACN	249577
Time
Date	199308
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gif
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 1350 flight time type : 105
ASRS Report	249577
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During a normal rolling after a landing with an small aircraft twin, I noticed the wing gradually lowering on ground rolling only after 300 to 400 ft beyond the touchdown point. I suddenly tried to feather both propellers and shut the engine down securing the aircraft, but the right propeller spinning only by inertia, touched the ground just before stopping. Meanwhile, the aircraft was sliding to the right side of the runway. At the time the aircraft stopped and I got out of the cabin, I saw the right gear below the trailing edge underneath the right flap. At that point I understood that the final cause was the collapsed structure of the gear joint with the wing. Pointing out that we had all 3 green lights on and the landing wasn't that hard, with only 5 to 8 KTS of headwind (no crosswind component) for runway 22, the factor that could have caused the incident is the stress due to the yrs of operation of the aircraft. Damage reported on the aircraft is only on right main gear, right flap, right aileron, right propeller.

Original NASA ASRS Text

Title: R GEAR COLLAPSES ON SMA TWIN DURING TRAINING IN PROGRESS, LNDG.

Narrative: DURING A NORMAL ROLLING AFTER A LNDG WITH AN SMA TWIN, I NOTICED THE WING GRADUALLY LOWERING ON GND ROLLING ONLY AFTER 300 TO 400 FT BEYOND THE TOUCHDOWN POINT. I SUDDENLY TRIED TO FEATHER BOTH PROPS AND SHUT THE ENG DOWN SECURING THE ACFT, BUT THE R PROP SPINNING ONLY BY INERTIA, TOUCHED THE GND JUST BEFORE STOPPING. MEANWHILE, THE ACFT WAS SLIDING TO THE R SIDE OF THE RWY. AT THE TIME THE ACFT STOPPED AND I GOT OUT OF THE CABIN, I SAW THE R GEAR BELOW THE TRAILING EDGE UNDERNEATH THE R FLAP. AT THAT POINT I UNDERSTOOD THAT THE FINAL CAUSE WAS THE COLLAPSED STRUCTURE OF THE GEAR JOINT WITH THE WING. POINTING OUT THAT WE HAD ALL 3 GREEN LIGHTS ON AND THE LNDG WASN'T THAT HARD, WITH ONLY 5 TO 8 KTS OF HEADWIND (NO XWIND COMPONENT) FOR RWY 22, THE FACTOR THAT COULD HAVE CAUSED THE INCIDENT IS THE STRESS DUE TO THE YRS OF OP OF THE ACFT. DAMAGE RPTED ON THE ACFT IS ONLY ON R MAIN GEAR, R FLAP, R AILERON, R PROP.

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.