Seaplane gear collapse on turn off runway.

Attributes
ACN	198925
Time
Date	199201
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : omn
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	ground other : taxi landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	observation : observer
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 300 flight time type : 1
ASRS Report	198925
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During entry to traffic pattern the PIC, flying from left seat, lowered landing gear. I was flying the traffic pattern from the right seat. When the gear was down, we both visually checked that the gear was down (the gear is visible from cockpit). The gear position light went from red (up) to green (down). During short final, the PIC took control of aircraft. At this time the final gear check was made by both pilots. At this time we both had every indication that the gear was down and locked. After touchdown, as we were turning on the taxiway, the main gear collapsed. The aircraft skidded to a halt. The preliminary inspection showed almost no damage to the aircraft. The plane just skidded on its keel (the engine and propeller are located on top of the wing and received no damage). At this time, the landing gear has not been inspected. Maintenance personnel feel the following is the cause: when the gear was lowered, the locking pin did not engage. Even without the locking pin in place, the gear visually appeared down and locked. The green gear light came on without the gear being locked. The smooth touchdown and roll out didn't stress the gear enough to cause its retraction. During taxiway turn off, the brakes were applied and the gear rotated backwards and the aircraft slid on its keel.

Original NASA ASRS Text

Title: SEAPLANE GEAR COLLAPSE ON TURN OFF RWY.

Narrative: DURING ENTRY TO TFC PATTERN THE PIC, FLYING FROM L SEAT, LOWERED LNDG GEAR. I WAS FLYING THE TFC PATTERN FROM THE R SEAT. WHEN THE GEAR WAS DOWN, WE BOTH VISUALLY CHKED THAT THE GEAR WAS DOWN (THE GEAR IS VISIBLE FROM COCKPIT). THE GEAR POS LIGHT WENT FROM RED (UP) TO GREEN (DOWN). DURING SHORT FINAL, THE PIC TOOK CTL OF ACFT. AT THIS TIME THE FINAL GEAR CHK WAS MADE BY BOTH PLTS. AT THIS TIME WE BOTH HAD EVERY INDICATION THAT THE GEAR WAS DOWN AND LOCKED. AFTER TOUCHDOWN, AS WE WERE TURNING ON THE TAXIWAY, THE MAIN GEAR COLLAPSED. THE ACFT SKIDDED TO A HALT. THE PRELIMINARY INSPECTION SHOWED ALMOST NO DAMAGE TO THE ACFT. THE PLANE JUST SKIDDED ON ITS KEEL (THE ENG AND PROP ARE LOCATED ON TOP OF THE WING AND RECEIVED NO DAMAGE). AT THIS TIME, THE LNDG GEAR HAS NOT BEEN INSPECTED. MAINT PERSONNEL FEEL THE FOLLOWING IS THE CAUSE: WHEN THE GEAR WAS LOWERED, THE LOCKING PIN DID NOT ENGAGE. EVEN WITHOUT THE LOCKING PIN IN PLACE, THE GEAR VISUALLY APPEARED DOWN AND LOCKED. THE GREEN GEAR LIGHT CAME ON WITHOUT THE GEAR BEING LOCKED. THE SMOOTH TOUCHDOWN AND ROLL OUT DIDN'T STRESS THE GEAR ENOUGH TO CAUSE ITS RETRACTION. DURING TAXIWAY TURN OFF, THE BRAKES WERE APPLIED AND THE GEAR ROTATED BACKWARDS AND THE ACFT SLID ON ITS KEEL.

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.