GA small aircraft amphibian landed gear up after practicing water lndgs.

Attributes
ACN	161862
Time
Date	199010
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tul
State Reference	OK
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
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 40 flight time total : 6000 flight time type : 100
ASRS Report	161862
Events
Anomaly	other anomaly other
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:

Aircraft is an amphibian which has peculiar gear extension procedures due to the fact that it has to have gear up for water lndgs and gear down for land lndgs. This precludes installation of a gear warning horn. During takeoff from runway immediately preceding this landing, aircraft experienced substantial gear shimmy. No gear problems were experienced during 2 intervening water lndgs. Upon completion of the before landing checklist, having put the gear lever in the down position, was surprised when keel touched the runway first. Aircraft received minor damage on the keel. Corrective suggestion: put warning system including horn.

Original NASA ASRS Text

Title: GA SMA AMPHIBIAN LANDED GEAR UP AFTER PRACTICING WATER LNDGS.

Narrative: ACFT IS AN AMPHIBIAN WHICH HAS PECULIAR GEAR EXTENSION PROCS DUE TO THE FACT THAT IT HAS TO HAVE GEAR UP FOR WATER LNDGS AND GEAR DOWN FOR LAND LNDGS. THIS PRECLUDES INSTALLATION OF A GEAR WARNING HORN. DURING TKOF FROM RWY IMMEDIATELY PRECEDING THIS LNDG, ACFT EXPERIENCED SUBSTANTIAL GEAR SHIMMY. NO GEAR PROBS WERE EXPERIENCED DURING 2 INTERVENING WATER LNDGS. UPON COMPLETION OF THE BEFORE LNDG CHKLIST, HAVING PUT THE GEAR LEVER IN THE DOWN POS, WAS SURPRISED WHEN KEEL TOUCHED THE RWY FIRST. ACFT RECEIVED MINOR DAMAGE ON THE KEEL. CORRECTIVE SUGGESTION: PUT WARNING SYS INCLUDING HORN.

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.