Thursday, December 30, 2021

Collision During Takeoff: Mooney M-20J, N5765N; accident occurred June 20, 2021at Ryan Field Airport (2MT1), West Glacier, Flathead County, Montana

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; Helena, Montana

Investigation Docket - National Transportation Safety Board:
Location: West Glacier, Montana
Accident Number: WPR21LA239
Date and Time: June 20, 2021, 15:00 Local
Registration: N5765N
Aircraft: Mooney M20J 
Aircraft Damage: Substantial
Defining Event: Collision during takeoff/land
Injuries: 1 None
Flight Conducted Under: Part 91: General aviation - Personal


The pilot reported that, he was departing to the south on a 2,500 ft long grass runway at a mountain airport with an estimated 5,000 ft mean sea level density altitude. The pilot calculated the airplane’s performance using the pilot’s operating handbook, which revealed a takeoff distance of 1,800 ft on grass. According to the pilot, during the takeoff run, the airplane lifted off the ground after traveling between 1,250 ft and 1,870 ft down the runway as the airplane reached 60 mph. However, the airplane touched back down to the runway surface near the end of the runway and impacted fallen timber before it came to rest. The airplane sustained substantial damage to the rudder and right wing. The pilot reported that there were no mechanical failures or malfunctions with the airplane that would have precluded normal operation.

The pilot stated that, before his takeoff run, he observed the windsock, which indicated winds from the east at 9 kts. However, wind data retrieved from a nearby station and sounding information indicated that winds may have been from the north at 5 kt, which would have resulted in a tailwind.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot’s inadequate performance planning and decision to continue the takeoff which, resulted in a runway overrun and collision with terrain.


Personnel issues Performance calculations - Pilot
Personnel issues Decision making/judgment - Pilot
Environmental issues Tailwind - Effect on operation
Environmental issues High density altitude - Effect on operation

Factual Information

History of Flight

Takeoff Collision during takeoff/land (Defining event)

Pilot Information

Certificate: Private 
Age: 57, Male
Airplane Rating(s): Single-engine land
Seat Occupied: Left
Other Aircraft Rating(s): None 
Restraint Used: 3-point
Instrument Rating(s): Airplane 
Second Pilot Present:
Instructor Rating(s): None 
Toxicology Performed:
Medical Certification: Class 3 With waivers/limitations 
Last FAA Medical Exam: December 23, 2020
Occupational Pilot: No
Last Flight Review or Equivalent: January 9, 2020
Flight Time: 805 hours (Total, all aircraft), 409 hours (Total, this make and model), 716 hours (Pilot In Command, all aircraft), 15 hours (Last 90 days, all aircraft), 9 hours (Last 30 days, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Mooney 
Registration: N5765N
Model/Series: M20J 
Aircraft Category: Airplane
Year of Manufacture: 1984 
Amateur Built:
Airworthiness Certificate: Normal 
Serial Number: 24-1482
Landing Gear Type: Retractable - Tricycle
Seats: 4
Date/Type of Last Inspection: February 19, 2021 Annual 
Certified Max Gross Wt.: 2740 lbs
Time Since Last Inspection: 42 Hrs 
Engines: 1 Reciprocating
Airframe Total Time: 1306.7 Hrs at time of accident
Engine Manufacturer: Lycoming
ELT: C91 installed, activated, did not aid in locating accident
Engine Model/Series: IO-360-A3B6D
Registered Owner:
Rated Power: 200 Horsepower
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual (VMC)
Condition of Light: Day
Observation Facility, Elevation: KGPI, 2973 ft msl 
Distance from Accident Site: 16 Nautical Miles
Observation Time: 14:55 Local 
Direction from Accident Site: 229°
Lowest Cloud Condition: 
Visibility: 10 miles
Lowest Ceiling: Overcast / 7500 ft AGL
Visibility (RVR):
Wind Speed/Gusts: 5 knots / 
Turbulence Type Forecast/Actual:  /
Wind Direction: 350° 
Turbulence Severity Forecast/Actual:  /
Altimeter Setting: 30.17 inches Hg 
Temperature/Dew Point: 21°C / 8°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: West Glacier, MT 
Type of Flight Plan Filed: None
Destination: Kalispell, MT (S27)
Type of Clearance: None
Departure Time:
Type of Airspace: Class G

Airport Information

Airport: RYAN FLD 2MT1 
Runway Surface Type: Grass/turf
Airport Elevation: 3660 ft msl 
Runway Surface Condition: Dry
Runway Used: 15/33
IFR Approach: None
Runway Length/Width: 2500 ft / 65 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: 48.48,-113.96

No comments:

Post a Comment