GA small aircraft landing gear collapsed after landing.

Attributes
ACN	89985
Time
Date	198806
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 0s6
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Experience	flight time last 90 days : 175 flight time total : 956
ASRS Report	89985
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

A go around was initiated at the above airport. The landing gear and flaps were retracted on the go around and re-extended for the next approach. The landing gear retracted during the roll out after hitting a small bump in the runway. The pilot had extended the gear for the second landing, but had failed (apparently) to be certain that the landing gear was locked down. The aircraft was a manual retract small aircraft.

Original NASA ASRS Text

Title: GA SMA LNDG GEAR COLLAPSED AFTER LNDG.

Narrative: A GO AROUND WAS INITIATED AT THE ABOVE ARPT. THE LNDG GEAR AND FLAPS WERE RETRACTED ON THE GO AROUND AND RE-EXTENDED FOR THE NEXT APCH. THE LNDG GEAR RETRACTED DURING THE ROLL OUT AFTER HITTING A SMALL BUMP IN THE RWY. THE PLT HAD EXTENDED THE GEAR FOR THE SECOND LNDG, BUT HAD FAILED (APPARENTLY) TO BE CERTAIN THAT THE LNDG GEAR WAS LOCKED DOWN. THE ACFT WAS A MANUAL RETRACT SMA.

Data retrieved from NASA's ASRS site as of August 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.