Tuesday, June 08, 2021

Loss of Control on Ground: Maule M-4, N4718T; accident occurred June 02, 2021 at Mahoney Creek USFS Airport (0U3), Cascade, Valley County, Idaho

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; Boise, Idaho 

Investigation Docket - National Transportation Safety Board: https://data.ntsb.gov/Docket
Location: Cascade, Idaho
Accident Number: WPR21LA229
Date and Time: June 2, 2021, 10:05 Local
Registration: N4718T
Aircraft: Maule M-4
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 1 None
Flight Conducted  Under: Part 91: General aviation - Personal


The pilot of the tailwheel-equipped airplane reported that, after landing, and during taxi to the end of the runway to turn around to park, he did not see a deep steep ditch at the end of the runway. The airplane traveled into the ditch as the pilot applied full right rudder and full right brake in an attempt to turn, however, the airplane continued to slide into the ditch where the left-wing impact terrain.

The airplane sustained substantial damage to the left wing.

The pilot 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 maintain clearance from a ditch, which resulted in impact with terrain.


Personnel issues Monitoring environment - Pilot
Environmental issues Sloped/uneven terrain - Effect on equipment

Factual Information

History of Flight

Taxi-from runway Loss of control on ground (Defining event)

Pilot Information

Certificate: Private
Age: 73, Male
Airplane Rating(s): Single-engine land 
Seat Occupied: Unknown
Other Aircraft Rating(s): None 
Restraint Used: Unknown
Instrument Rating(s): None
Second Pilot Present:
Instructor Rating(s): None
Toxicology Performed:
Medical Certification: Class 3 With waivers/limitations 
Last FAA Medical Exam: September 4, 2020
Occupational Pilot: No 
Last Flight Review or Equivalent: May 17, 2021
Flight Time: (Estimated) 1045 hours (Total, all aircraft), 615 hours (Total, this make and model), 977 hours (Pilot In Command, all aircraft), 24.4 hours (Last 90 days, all aircraft), 24.4 hours (Last 30 days, all aircraft), 3.7 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Maule
Registration: N4718T
Model/Series: M-4 
Aircraft Category: Airplane
Year of Manufacture: 1964
Amateur Built:
Airworthiness Certificate: Normal
Serial Number: 61
Landing Gear Type: Tailwheel
Seats: 4
Date/Type of Last Inspection: October 1, 2020 Annual
Certified Max Gross Wt.: 2100 lbs
Time Since Last Inspection: 31 Hrs
Engines: 1 Reciprocating
Airframe Total Time: 2750.9 Hrs at time of accident
Engine Manufacturer: Continental
ELT: C126 installed, not activated 
Engine Model/Series: O-300-A
Registered Owner: 
Rated Power: 145 Horsepower
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual (VMC) 
Condition of Light: Day
Observation Facility, Elevation: KLLJ, 5072 ft msl
Distance from Accident Site: 33 Nautical Miles
Observation Time: 09:55 Local
Direction from Accident Site: 114°
Lowest Cloud Condition: Clear
Visibility: 10 miles
Lowest Ceiling: 
Visibility (RVR):
Wind Speed/Gusts: 3 knots / 
Turbulence Type Forecast/Actual: None / None
Wind Direction: 60° 
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.12 inches Hg
Temperature/Dew Point: 21°C / 6°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Soldier Bar, ID (85U)
Type of Flight Plan Filed: None
Destination: Cascade, ID
Type of Clearance: Unknown
Departure Time: 
Type of Airspace: Class G

Airport Information

Runway Surface Type: Dirt
Airport Elevation: 4618 ft msl
Runway Surface Condition: Dry
Runway Used: 04
IFR Approach: None
Runway Length/Width: 2150 ft / 15 ft 
VFR Approach/Landing: None

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: 44.744583,-114.92138

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