Small aircraft flips over on its back after touchdown dynamics take over. Landing procedure rollout.

Attributes
ACN	218001
Time
Date	199208
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stp
State Reference	MN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial
Experience	flight time last 90 days : 25 flight time total : 720 flight time type : 180
ASRS Report	218001
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
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:

Executing a normal landing on a hard surface runway. Aircraft waffled slightly and then flipped over on its back in a split second. Not sure what happened, continue to look for cause. No injuries or damage to other property except aircraft in use. Damage to engine, propeller, rudder, engine mounts, fuel filler neck, and 2 ft of leading edge of wing.

Original NASA ASRS Text

Title: SMA FLIPS OVER ON ITS BACK AFTER TOUCHDOWN DYNAMICS TAKE OVER. LNDG PROC ROLLOUT.

Narrative: EXECUTING A NORMAL LNDG ON A HARD SURFACE RWY. ACFT WAFFLED SLIGHTLY AND THEN FLIPPED OVER ON ITS BACK IN A SPLIT SECOND. NOT SURE WHAT HAPPENED, CONTINUE TO LOOK FOR CAUSE. NO INJURIES OR DAMAGE TO OTHER PROPERTY EXCEPT ACFT IN USE. DAMAGE TO ENG, PROP, RUDDER, ENG MOUNTS, FUEL FILLER NECK, AND 2 FT OF LEADING EDGE OF WING.

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.