A C310 with a student and CFI have the left main gear collapse while turning onto the runway.

Attributes
ACN	572856
Time
Date	200302
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : eky.airport
State Reference	AL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Plan	VFR
Aircraft 2
Flight Phase	ground : taxi
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : cfi pilot : instrument pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 1700 flight time type : 10
ASRS Report	572856
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other other
Supplementary
Primary Problem	Aircraft

Narrative:

After performing the 6TH landing of the thus far uneventful flight, plane taxiing back to active runway 5, at slightly more then 100% power was making right turn from taxiway to runway, about the time that student (a multi-engine instructor) was straightening out for centerline, left main collapsed. Damage resulted to left propeller, engine, wing, horizontal stabilizer. No injury to both pilots. At all times, no indication of abnormal activity with gear system. Appears to be parts failure.

Original NASA ASRS Text

Title: A C310 WITH A STUDENT AND CFI HAVE THE L MAIN GEAR COLLAPSE WHILE TURNING ONTO THE RWY.

Narrative: AFTER PERFORMING THE 6TH LNDG OF THE THUS FAR UNEVENTFUL FLT, PLANE TAXIING BACK TO ACTIVE RWY 5, AT SLIGHTLY MORE THEN 100% PWR WAS MAKING R TURN FROM TXWY TO RWY, ABOUT THE TIME THAT STUDENT (A MULTI-ENG INSTRUCTOR) WAS STRAIGHTENING OUT FOR CTRLINE, L MAIN COLLAPSED. DAMAGE RESULTED TO L PROP, ENG, WING, HORIZ STABILIZER. NO INJURY TO BOTH PLTS. AT ALL TIMES, NO INDICATION OF ABNORMAL ACTIVITY WITH GEAR SYS. APPEARS TO BE PARTS FAILURE.

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.