Saturday, December 05, 2020

Loss of Control in Flight: Flight Design CTSW, N91WW; Accident occurred December 20, 2019 at Delaware Municipal Airport (KDLZ), Ohio

Aviation Accident Final Report - National Transportation Safety Board

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Columbus, Ohio

Investigation Docket - National Transportation Safety Board:

Sunrae Aviation LLC

New Flyers Association

Location: Delaware, Ohio
Accident Number: CEN20CA039
Date & Time: December 20, 2019, 15:40 Local
Registration: N91WW
Aircraft: Flight Design CTSW 
Aircraft Damage: Substantial
Defining Event: Loss of control in flight Injuries: 1 Minor
Flight Conducted Under: Part 91: General aviation - Instructional


The solo student pilot was flying in the traffic pattern and was intending to perform a touch-and-go landing. During the takeoff, the airplane "veered heavily to the left." The student attempted to correct the veer without success. The student then chose to land the airplane on grassy terrain. During the landing, the airplane bounced twice and nosed over, which resulted in substantial damage to the right wing and the rudder. The student reported that there were no preaccident mechanical malfunctions or failures 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 student pilot's failure to maintain yaw control during takeoff, which resulted in an aborted takeoff and subsequent landing on grassy terrain, during which the airplane bounced and then nosed over.

Personnel issues Aircraft control - Student/instructed pilot
Aircraft Yaw control - Not attained/maintained
Environmental issues Soft surface - Effect on operation

Factual Information

History of Flight

Takeoff Loss of control in flight (Defining event)
Takeoff Attempted remediation/recovery
Takeoff-rejected takeoff Abnormal runway contact
Takeoff-rejected takeoff Nose over/nose down

Pilot Information

Certificate: Student 
Age: 42, Male
Airplane Rating(s): None
Seat Occupied: Left
Other Aircraft Rating(s): None 
Restraint Used: 4-point
Instrument Rating(s): None 
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 Without waivers/limitations
Last FAA Medical Exam: September 20, 2019
Occupational Pilot: No 
Last Flight Review or Equivalent:
Flight Time: 40 hours (Total, all aircraft), 25 hours (Total, this make and model), 27 hours (Last 90 days, all aircraft), 15 hours (Last 30 days, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Flight Design 
Registration: N91WW
Model/Series: CTSW 
Aircraft Category: Airplane
Year of Manufacture: 2006 
Amateur Built: No
Airworthiness Certificate: Special light-sport (Special)
Serial Number: 5-646-942
Landing Gear Type: Tricycle
Seats: 2
Date/Type of Last Inspection: November 1, 2019 Condition 
Certified Max Gross Wt.: 1320 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 802 Hrs at time of accident 
Engine Manufacturer: Rotax
ELT: Installed, activated, did not aid in locating accident
Engine Model/Series: ULS2
Registered Owner:
Rated Power: 100 Horsepower
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: 3 knots /
Turbulence Type Forecast/Actual: None / None
Wind Direction: 170° 
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.5 inches Hg 
Temperature/Dew Point: 2°C / -2°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Delaware, OH (DLZ) 
Type of Flight Plan Filed: None
Destination: Delaware, OH (DLZ)
Type of Clearance: None
Departure Time: 15:30 Local
Type of Airspace: Class G

Airport Information

Airport: Delaware Municipal Airport DLZ 
Runway Surface Type: Asphalt
Airport Elevation: 945 ft msl 
Runway Surface Condition: Dry
Runway Used: 28 IFR
Approach: None
Runway Length/Width: 5800 ft / 100 ft 
VFR Approach/Landing: Touch and go;Traffic pattern

Wreckage and Impact Information

Crew Injuries: 1 Minor 
Aircraft Damage: Substantial
Passenger Injuries:
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 Minor
Latitude, Longitude: 40.279724,-83.114723(est)

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