A cessna T310R on landing the right main landing gear collapsed due to the failure to lock in the ex...

Attributes
ACN	389619
Time
Date	199712
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : day
State Reference	OH
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : day
Operator	general aviation : personal
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	landing other other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 65 flight time total : 2741 flight time type : 56
ASRS Report	389619
Person 2
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : cfi
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	other
Consequence	other Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On landing rollout at moraine airport (I73) I noticed the right wing dipping further than normal, about down to the ground. I proceeded to initiate a go around. We had 3 green (gear safe) lights on during the approach to land but now there were only 2, right main showed unsafe. I tried retracting and extending the gear again with only 2 lights illuminating, still third (right main) showed unsafe. I then retracted gear mechanically again, then did an emergency gear extension. Still 2 out of 3 green lights. I tried a fly-by over flight office and an instructor radioed back the gear looked down and locked. I tried another landing but again the right wing began to fall during rollout. I then went to wright brothers airport (mgy) to try a safer landing on the longer runway. Still same drop on right wing. Their mechanic also looked at the gear as I flew by low and slow. I tried one final attempt to land with no avail. I then proceeded to dayton international (day). I did 1 last touch-and-go to test the right main but had to go around again. I proceeded on a 3 mi final, held the airplane off the runway till approximately 65 KTS, and softly touched down. Just after touchdown I shut down and feathered the right engine and then down came the right wing. It struck the runway pulling the aircraft right of center and off the runway into the grass. Mechanics found 2 bolts on landing gear sheared.

Original NASA ASRS Text

Title: A CESSNA T310R ON LNDG THE R MAIN LNDG GEAR COLLAPSED DUE TO THE FAILURE TO LOCK IN THE EXTEND POS CAUSED BY SHEARED BOLTS IN THE LNDG GEAR ASSEMBLY.

Narrative: ON LNDG ROLLOUT AT MORAINE ARPT (I73) I NOTICED THE R WING DIPPING FURTHER THAN NORMAL, ABOUT DOWN TO THE GND. I PROCEEDED TO INITIATE A GAR. WE HAD 3 GREEN (GEAR SAFE) LIGHTS ON DURING THE APCH TO LAND BUT NOW THERE WERE ONLY 2, RIGHT MAIN SHOWED UNSAFE. I TRIED RETRACTING AND EXTENDING THE GEAR AGAIN WITH ONLY 2 LIGHTS ILLUMINATING, STILL THIRD (R MAIN) SHOWED UNSAFE. I THEN RETRACTED GEAR MECHANICALLY AGAIN, THEN DID AN EMER GEAR EXTENSION. STILL 2 OUT OF 3 GREEN LIGHTS. I TRIED A FLY-BY OVER FLT OFFICE AND AN INSTRUCTOR RADIOED BACK THE GEAR LOOKED DOWN AND LOCKED. I TRIED ANOTHER LNDG BUT AGAIN THE R WING BEGAN TO FALL DURING ROLLOUT. I THEN WENT TO WRIGHT BROTHERS ARPT (MGY) TO TRY A SAFER LNDG ON THE LONGER RWY. STILL SAME DROP ON R WING. THEIR MECH ALSO LOOKED AT THE GEAR AS I FLEW BY LOW AND SLOW. I TRIED ONE FINAL ATTEMPT TO LAND WITH NO AVAIL. I THEN PROCEEDED TO DAYTON INTL (DAY). I DID 1 LAST TOUCH-AND-GO TO TEST THE R MAIN BUT HAD TO GAR AGAIN. I PROCEEDED ON A 3 MI FINAL, HELD THE AIRPLANE OFF THE RWY TILL APPROX 65 KTS, AND SOFTLY TOUCHED DOWN. JUST AFTER TOUCHDOWN I SHUT DOWN AND FEATHERED THE R ENG AND THEN DOWN CAME THE R WING. IT STRUCK THE RWY PULLING THE ACFT R OF CTR AND OFF THE RWY INTO THE GRASS. MECHS FOUND 2 BOLTS ON LNDG GEAR SHEARED.

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.

A cessna T310R on landing the right main landing gear collapsed due to the failure to lock in the extend position caused by sheared bolts in the landing gear assembly.