Saturday, May 15, 2021

Landing Gear Not Configured: Aviat A-1B Husky, N990HP; accident occurred May 15, 2020 in Lake Guntersville, Marshall County, Alabama

Aviation Accident Final Report - National Transportation Safety Board

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Birmingham, Alabama

Investigation Docket - National Transportation Safety Board:

Location: Guntersville, AL
Accident Number: ERA20CA187
Date & Time: 05/15/2020, 1845 CDT
Registration: N990HP
Aircraft: Aviat A1B
Aircraft Damage: Substantial
Defining Event: Landing gear not configured
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Personal 


The pilot of the amphibious float equipped airplane reported that while landing on the water, he experienced a very hard, violent landing with a nose down pitch attitude and the airplane nosed over. He further reported that, prior to the landing on the water he had previously departed a land based airport and while on final approach to the lake for landing, he was distracted by a boat in the area and did not verify that the landing gear was retracted for a water landing. The airplane sustained substantial damage to both wings and right-wing lift struts. The pilot also reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.  

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's failure to retract the amphibious airplane's landing gear wheels prior to a water landing, which resulted in a nose over.


Aircraft Landing gear/wheel fairing - Unintentional use/operation
Personnel issues Use of equip/system - Pilot
Personnel issues Forgotten action/omission - Pilot

Factual Information

History of Flight

Landing-flare/touchdown Landing gear not configured (Defining event)
Landing-flare/touchdown Nose over/nose down

Pilot Information

Certificate: Commercial
Age: 31, Male
Airplane Rating(s): Multi-engine Land; Multi-engine Sea; Single-engine Land; Single-engine Sea
Seat Occupied: Right
Other Aircraft Rating(s): Glider; Helicopter
Restraint Used:
Instrument Rating(s): Airplane; Helicopter
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No 
Medical Certification: Class 2 Without Waivers/Limitations
Last FAA Medical Exam: 06/10/2019
Occupational Pilot: Yes 
Last Flight Review or Equivalent: 04/21/2020
Flight Time:  (Estimated) 1749 hours (Total, all aircraft), 149 hours (Total, this make and model), 1209 hours (Pilot In Command, all aircraft), 65 hours (Last 90 days, all aircraft), 24 hours (Last 30 days, all aircraft), 5 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Aviat
Registration: N990HP
Model/Series: A1B
Aircraft Category: Airplane
Year of Manufacture: 2000
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 2109
Landing Gear Type: Amphibian;
Seats: 2
Date/Type of Last Inspection: 06/26/2019, Annual
Certified Max Gross Wt.: 2200 lbs
Time Since Last Inspection: 99 Hours
Engines:1 Reciprocating 
Airframe Total Time: 1854.8 Hours as of last inspection
Engine Manufacturer: Lycoming
ELT: C126 installed, activated, did not aid in locating accident
Engine Model/Series: O-360-A1P
Registered Owner: On file
Rated Power: 180 hp
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: 4A6, 650 ft msl
Distance from Accident Site: 10 Nautical Miles
Observation Time: 1855 CDT
Direction from Accident Site: 36°
Lowest Cloud Condition: Scattered / 6000 ft agl
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 4 knots /
Turbulence Type Forecast/Actual: None / None
Wind Direction: 180°
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30 inches Hg
Temperature/Dew Point: 26°C / 16°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Guntersville, AL (8A1)
Type of Flight Plan Filed: None
Destination: Huntsville, AL (HSV)
Type of Clearance: None
Departure Time: 1800 CDT
Type of Airspace: Class G

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude: 34.554722, -86.123056 (est)

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