Wednesday, March 17, 2021

Loss of Control on Ground: Piper PA-11 Cub Special, N4926M; accident occurred March 15, 2019 at Omar N. Bradley Airport (KMBY), Moberly, Randolph County, Missouri

Aviation Accident Final Report - National Transportation Safety Board 

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Kansas City, Missouri

Investigation Docket - National Transportation Safety Board:

Location: Moberly, MO
Accident Number: GAA19CA170
Date & Time: 03/15/2019, 1500 EDT
Registration: N4926M
Aircraft: Piper PA 11
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Positioning


The pilot of the tailwheel-equipped airplane reported that, during the landing roll, the right wing "lifted abruptly and rapidly." He attempted to correct with right aileron, but the airplane veered left and then began to yaw left. The pilot added right rudder and power to correct to no avail. Subsequently, he reduced power, and the airplane exited the runway, impacted a ditch, and then came to rest inverted.

The airplane sustained substantial damage to the right wing and rudder.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

The pilot estimated that the wind was from 300° at 24 knots, gusting to 28 knots. The airport's automated weather observation station reported that, about 5 minutes before the accident, the wind was from 320° at 15 knots, gusting to 21 knots. The pilot landed the airplane on runway 31.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's failure to maintain directional control during the landing roll in gusting wind conditions.


Aircraft Directional control - Not attained/maintained
Personnel issues Aircraft control - Pilot
Environmental issues Gusts - Effect on operation
Environmental issues Sloped/uneven terrain - Contributed to outcome

Factual Information

History of Flight

Landing-landing roll Miscellaneous/other
Landing-landing roll Loss of control on ground (Defining event)
Landing-landing roll Attempted remediation/recovery
Landing-landing roll Runway excursion
Landing-landing roll Collision with terr/obj (non-CFIT)
Landing-landing roll Nose over/nose down

Pilot Information

Certificate: Flight Instructor; Commercial
Age: 24, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Front
Other Aircraft Rating(s): None
Restraint Used: 4-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): Airplane Multi-engine; Airplane Single-engine; Instrument Airplane
Toxicology Performed: No
Medical Certification: Class 1 Without Waivers/Limitations
Last FAA Medical Exam: 02/04/2019
Occupational Pilot: Yes
Last Flight Review or Equivalent: 02/01/2019
Flight Time:  (Estimated) 2500 hours (Total, all aircraft), 2 hours (Total, this make and model), 2400 hours (Pilot In Command, all aircraft), 170 hours (Last 90 days, all aircraft), 70 hours (Last 30 days, all aircraft), 0 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Piper
Registration: N4926M
Model/Series: PA 11 No Series
Aircraft Category: Airplane
Year of Manufacture: 1947
Amateur Built: No
Airworthiness Certificate: Restricted
Serial Number: 11-1638
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 03/26/2018, Annual
Certified Max Gross Wt.: 1220 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: Continental
ELT: Installed, activated, did not aid in locating accident
Engine Model/Series: C90 SERIES
Registered Owner: Orion Aviation Ltd
Rated Power: 90 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: KMBY, 867 ft msl
Distance from Accident Site: 0 Nautical Miles
Observation Time: 1955 UTC
Direction from Accident Site: 92°
Lowest Cloud Condition: Clear
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 15 knots / 21 knots
Turbulence Type Forecast/Actual: None / None
Wind Direction: 320°
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.28 inches Hg
Temperature/Dew Point: 9°C / -7°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Omaha, NE (MLE)
Type of Flight Plan Filed: None
Destination: Moberly, MO (MBY)
Type of Clearance: None
Departure Time: 1300 CST
Type of Airspace: Class G

Airport Information

Airport: Omar N Bradley (MBY)
Runway Surface Type: Asphalt
Airport Elevation: 866 ft
Runway Surface Condition: Dry
Runway Used: 31
IFR Approach: None
Runway Length/Width: 5001 ft / 100 ft
VFR Approach/Landing: None

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 39.464167, -92.431944 (est)

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