Landing gear collapses after touchdown for small aircraft at pao.

Attributes
ACN	144122
Time
Date	199004
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pao
State Reference	CA
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	instruction : trainee
Qualification	pilot : private
Experience	flight time last 90 days : 38 flight time total : 160 flight time type : 13
ASRS Report	144122
Person 2
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 178 flight time total : 1220 flight time type : 60
ASRS Report	144101
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After normal T/D the left landing gear collapsed during rollout. The wind was straight down the runway at approximately 13 KTS. Airspeed at the runway threshold was 95 KTS (normal per poh). As the nose wheel was lowered to the runway, the left main landing gear strut housing (casting) broke (possible metal fatigue) causing the gear to shear and collapse. Right brake was immediately applied hard! Master switch was turned off, engine stopped (mixture to idle cutoff) and fuel selector set to off. With right brake locked, plane eventually arced off to the left side of the runway approximately 200' from runway end. Damage to the left wing was not extensive. The propeller did not strike the runway. There was no property damage and no one was injured.

Original NASA ASRS Text

Title: LNDG GEAR COLLAPSES AFTER TOUCHDOWN FOR SMA AT PAO.

Narrative: AFTER NORMAL T/D THE LEFT LNDG GEAR COLLAPSED DURING ROLLOUT. THE WIND WAS STRAIGHT DOWN THE RWY AT APPROX 13 KTS. AIRSPD AT THE RWY THRESHOLD WAS 95 KTS (NORMAL PER POH). AS THE NOSE WHEEL WAS LOWERED TO THE RWY, THE LEFT MAIN LNDG GEAR STRUT HOUSING (CASTING) BROKE (POSSIBLE METAL FATIGUE) CAUSING THE GEAR TO SHEAR AND COLLAPSE. RIGHT BRAKE WAS IMMEDIATELY APPLIED HARD! MASTER SWITCH WAS TURNED OFF, ENG STOPPED (MIXTURE TO IDLE CUTOFF) AND FUEL SELECTOR SET TO OFF. WITH RIGHT BRAKE LOCKED, PLANE EVENTUALLY ARCED OFF TO THE LEFT SIDE OF THE RWY APPROX 200' FROM RWY END. DAMAGE TO THE LEFT WING WAS NOT EXTENSIVE. THE PROP DID NOT STRIKE THE RWY. THERE WAS NO PROPERTY DAMAGE AND NO ONE WAS INJURED.

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.