Thursday, November 25, 2021

Abnormal Runway Contact: Zenith STOL CH701, N705L; accident occurred September 01, 2021 at Grantsburg Municipal Airport (KGTG), Burnett County, Wisconsin







Aviation Accident Final Report - National Transportation Safety Board

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Minneapolis, Minnesota 

Investigation Docket - National Transportation Safety Board:


Location: Grantsburg, Wisconsin
Accident Number: CEN21LA398
Date and Time: September 1, 2021, 15:30 Local 
Registration: N705L
Aircraft: SEGARRA LUCAS JR ZENITH STOLL 701
Aircraft Damage: Substantial
Defining Event: Abnormal runway contact 
Injuries: 1 None
Flight Conducted Under: Part 91: General aviation - Personal

Analysis

During landing with a slight quartering tail wind, the airplane touched down on the grass runway. The pilot reported that the runway was rougher than anticipated and attempted to lift the nose wheel for the remaining landing roll. The airplane became airborne, and the pilot pushed the control stick to a nose down position. The airplane bounced and then landed on the side of the nose wheel. The nose wheel collapsed, and the airplane flipped over and came to rest inverted. During the accident sequence, the airplane sustained substantial damage to the vertical stabilizer, rudder, and aft fuselage. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operations.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot’s improper landing flare, which resulted in abnormal runway contact and the nose landing gear collapsing. 

Findings

Environmental issues Rough terrain - Effect on operation
Aircraft Landing flare - Not attained/maintained
Personnel issues Aircraft control - Pilot
Personnel issues Decision making/judgment - Pilot

Factual Information

History of Flight

Landing-flare/touchdown Abnormal runway contact (Defining event)
Landing-landing roll Nose over/nose down

Pilot Information

Certificate: Private 
Age: 68, Male
Airplane Rating(s): Single-engine land 
Seat Occupied: Left
Other Aircraft Rating(s): None 
Restraint Used: 3-point
Instrument Rating(s): None 
Second Pilot Present: No
Instructor Rating(s): None 
Toxicology Performed:
Medical Certification: None 
Last FAA Medical Exam: January 11, 1991
Occupational Pilot: No 
Last Flight Review or Equivalent: January 1, 2018
Flight Time: 200 hours (Total, all aircraft), 40 hours (Total, this make and model), 200 hours (Pilot In Command, all aircraft), 19 hours (Last 90 days, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: SEGARRA LUCAS JR 
Registration: N705L
Model/Series: ZENITH STOLL 701
Aircraft Category: Airplane
Year of Manufacture: 2011
Amateur Built: Yes
Airworthiness Certificate: Experimental (Special)
Serial Number: 7-6170
Landing Gear Type: Tricycle
Seats: 2
Date/Type of Last Inspection: June 7, 2021 
Condition Certified Max Gross Wt.: 1100 lbs
Time Since Last Inspection: 
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: Volkswagen
ELT: Installed, not activated 
Engine Model/Series: 2300 CC
Registered Owner: 
Rated Power:
Operator: On file 
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual (VMC) 
Condition of Light: Day
Observation Facility, Elevation: 
Distance from Accident Site:
Observation Time: 
Direction from Accident Site:
Lowest Cloud Condition: Clear 
Visibility 10 miles
Lowest Ceiling: None 
Visibility (RVR):
Wind Speed/Gusts: /
Turbulence Type Forecast/Actual:  /
Wind Direction:
Turbulence Severity Forecast/Actual:  /
Altimeter Setting: 
Temperature/Dew Point:
Precipitation and Obscuration:
Departure Point: Grantsburg, WI
Type of Flight Plan Filed: None
Destination: Grantsburg, WI
Type of Clearance: None
Departure Time:
Type of Airspace: Class G

Airport Information

Airport: GRANTSBURG MUNI GTG 
Runway Surface Type: Grass/turf
Airport Elevation: 927 ft msl 
Runway Surface Condition: Rough; Soft
Runway Used: 05/23
IFR Approach: None
Runway Length/Width: 3280 ft / 120 ft
VFR Approach/Landing: Full stop; Traffic pattern

Wreckage and Impact Information

Crew Injuries: 1 None 
Aircraft Damage: Substantial
Passenger Injuries:
Aircraft Fire: None
Ground Injuries: 
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 45.774231,-92.680506 (est)

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