Landing gear shears off upon landing.

Attributes
ACN	316115
Time
Date	199509
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tdz
State Reference	OH
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 1580 flight time type : 700
ASRS Report	316115
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

The instrument training flight was done in a club airplane and was stopped after experiencing problems with the turn coordinator. We returned to the airport for landing. The student has his private pilot's rating and is current with a current medical. The wind was about 340 degrees at 10 KTS and he chose to land on runway 32. The pilot lined up on the runway with about a 5 degree crab into the wind. Upon touchdown I heard a crunching noise from the right landing gear. The pilot added power as he bounced slightly, and upon touching down again, the right landing gear collapsed. The landing in my opinion was not a hard landing and the collapsing of the gear was a complete surprise. The aircraft slid about 700 ft and came to rest on the grass between the runway and taxi area. While the airplane was sliding, I shut off the fuel mixture and electric fuel pump and magnetos, and instructed the pilot to shut off the fuel selector. The pilot was very upset and wasn't able to shut off the selector. I also opened the door and unhooked my seat belt and instructed the pilot to do the same and told him to exit the plane as soon as it stops. We got out and looked down and the right gear was wedged under the right wing. The next day an a&P mechanic inspected the airplane and found corrosion at the attach point and the two of the bolts had previously been cracked half way through.

Original NASA ASRS Text

Title: LNDG GEAR SHEARS OFF UPON LNDG.

Narrative: THE INST TRAINING FLT WAS DONE IN A CLUB AIRPLANE AND WAS STOPPED AFTER EXPERIENCING PROBS WITH THE TURN COORDINATOR. WE RETURNED TO THE ARPT FOR LNDG. THE STUDENT HAS HIS PVT PLT'S RATING AND IS CURRENT WITH A CURRENT MEDICAL. THE WIND WAS ABOUT 340 DEGS AT 10 KTS AND HE CHOSE TO LAND ON RWY 32. THE PLT LINED UP ON THE RWY WITH ABOUT A 5 DEG CRAB INTO THE WIND. UPON TOUCHDOWN I HEARD A CRUNCHING NOISE FROM THE R LNDG GEAR. THE PLT ADDED PWR AS HE BOUNCED SLIGHTLY, AND UPON TOUCHING DOWN AGAIN, THE R LNDG GEAR COLLAPSED. THE LNDG IN MY OPINION WAS NOT A HARD LNDG AND THE COLLAPSING OF THE GEAR WAS A COMPLETE SURPRISE. THE ACFT SLID ABOUT 700 FT AND CAME TO REST ON THE GRASS BTWN THE RWY AND TAXI AREA. WHILE THE AIRPLANE WAS SLIDING, I SHUT OFF THE FUEL MIXTURE AND ELECTRIC FUEL PUMP AND MAGNETOS, AND INSTRUCTED THE PLT TO SHUT OFF THE FUEL SELECTOR. THE PLT WAS VERY UPSET AND WASN'T ABLE TO SHUT OFF THE SELECTOR. I ALSO OPENED THE DOOR AND UNHOOKED MY SEAT BELT AND INSTRUCTED THE PLT TO DO THE SAME AND TOLD HIM TO EXIT THE PLANE AS SOON AS IT STOPS. WE GOT OUT AND LOOKED DOWN AND THE R GEAR WAS WEDGED UNDER THE R WING. THE NEXT DAY AN A&P MECH INSPECTED THE AIRPLANE AND FOUND CORROSION AT THE ATTACH POINT AND THE TWO OF THE BOLTS HAD PREVIOUSLY BEEN CRACKED HALF WAY THROUGH.

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.