Landing gear collapses during takeoff roll.

Attributes
ACN	274166
Time
Date	199406
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : prc
State Reference	AZ
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 54 flight time total : 278 flight time type : 10
ASRS Report	274166
Person 2
Affiliation	Other
Function	observation : company check pilot
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

How the problem arose I do not understand. During preflight I checked the gear handle 3 different times to make sure it was down. Contributing factors could have been a student who was previously in the aircraft doing dry time. This I was aware of due to a full rich mixture and a half closed throttle. Maybe the student was yanking on the gear handle. The problem undiscovered when the nose then left main collapsed during takeoff roll. Corrective actions required full right rudder to keep the aircraft from rotating to the left and possibly cartwheeling. Human perceptions during the preflight were high. Because this was a cfii check ride I was very thorough with the checklist. Factors affecting the quality of flight consisted of a large amount of stress I felt due to not only this being a check ride but also a flight, which if completed successfully, would allow me to receive my bachelor of science in aeronautical science and a commission as a second lieutenant in the air force. This additional stress may have enhanced my performance. Actions: I felt I reacted correctly and quickly by bringing back the power to idle and mixture to idle cut off once I recognized a problem. Also, I feel that the addition of right rudder may have prevented a cartwheeling of the aircraft.

Original NASA ASRS Text

Title: LNDG GEAR COLLAPSES DURING TKOF ROLL.

Narrative: HOW THE PROB AROSE I DO NOT UNDERSTAND. DURING PREFLT I CHKED THE GEAR HANDLE 3 DIFFERENT TIMES TO MAKE SURE IT WAS DOWN. CONTRIBUTING FACTORS COULD HAVE BEEN A STUDENT WHO WAS PREVIOUSLY IN THE ACFT DOING DRY TIME. THIS I WAS AWARE OF DUE TO A FULL RICH MIXTURE AND A HALF CLOSED THROTTLE. MAYBE THE STUDENT WAS YANKING ON THE GEAR HANDLE. THE PROB UNDISCOVERED WHEN THE NOSE THEN L MAIN COLLAPSED DURING TKOF ROLL. CORRECTIVE ACTIONS REQUIRED FULL R RUDDER TO KEEP THE ACFT FROM ROTATING TO THE L AND POSSIBLY CARTWHEELING. HUMAN PERCEPTIONS DURING THE PREFLT WERE HIGH. BECAUSE THIS WAS A CFII CHK RIDE I WAS VERY THOROUGH WITH THE CHKLIST. FACTORS AFFECTING THE QUALITY OF FLT CONSISTED OF A LARGE AMOUNT OF STRESS I FELT DUE TO NOT ONLY THIS BEING A CHK RIDE BUT ALSO A FLT, WHICH IF COMPLETED SUCCESSFULLY, WOULD ALLOW ME TO RECEIVE MY BACHELOR OF SCIENCE IN AERONAUTICAL SCIENCE AND A COMMISSION AS A SECOND LIEUTENANT IN THE AIR FORCE. THIS ADDITIONAL STRESS MAY HAVE ENHANCED MY PERFORMANCE. ACTIONS: I FELT I REACTED CORRECTLY AND QUICKLY BY BRINGING BACK THE PWR TO IDLE AND MIXTURE TO IDLE CUT OFF ONCE I RECOGNIZED A PROB. ALSO, I FEEL THAT THE ADDITION OF R RUDDER MAY HAVE PREVENTED A CARTWHEELING OF THE ACFT.

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.