Friday, November 20, 2020

Loss of Control on Ground: Mitsubishi Mu-2B-40, N425GZ; accident occurred January 29, 2020 at Flying Feathers Airport (11Y), Chilton, Calumet County, Wisconsin

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

Additional Participating Entities:

Federal Aviation Administration / Flight Standards District Office; Milwaukee, Wisconsin
Hartzell Propeller Inc; Piqua, Ohio
Honeywell Aerospace; Phoenix, Arizona
Mitsubishi Heavy Industries America Inc; Dallas, Texas

Investigation Docket - National Transportation Safety Board:

Location: Chilton, Wisconsin 
Accident Number: CEN20LA125
Date & Time: January 29, 2020, 09:00 Local
Registration: N425GZ
Aircraft: Mitsubishi MU 2B-40 
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 1 None
Flight Conducted Under: Part 91: General aviation - Personal

On January 29, 2020, about 0900 central standard time, a Mitsubishi MU-2B-40 airplane, N425GZ, was substantially damaged when it was involved in an accident at Flying Feathers Airport (11Y), Chilton, Wisconsin. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations (CFR) Part 91 personal flight.

The National Transportation Safety Board (NTSB) was informed of the accident on March 12, 2020, by the airframe manufacturer; it was not reported to the NTSB by the pilot. The pilot stated that while landing at his private turf airstrip, the airplane yawed left and the right wing was substantially damaged when it contacted the ground.

Pilot Information

Certificate: Airline transport 
Age: 48,Male
Airplane Rating(s): Single-engine land; Multi-engine land
Seat Occupied: Left
Other Aircraft Rating(s): Helicopter 
Restraint Used: 4-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None 
Toxicology Performed: No
Medical Certification: Class 1 With waivers/limitations 
Last FAA Medical Exam: February 20, 2020
Occupational Pilot: Yes 
Last Flight Review or Equivalent: December 14, 2019
Flight Time: 21000 hours (Total, all aircraft), 93 hours (Total, this make and model), 53 hours (Last 90 days, all aircraft), 27 hours (Last 30 days, all aircraft), 0 hours (Last 24 hours, all aircraft) On December 14, 2019, the pilot completed an initial MU-2 training course, which included 14.9 flight hours and 20 hours of ground training as required 14 CFR Part 91 Subpart N.

Aircraft and Owner/Operator Information

Aircraft Make: Mitsubishi 
Registration: N425GZ
Model/Series: MU 2B-40 
Aircraft Category: Airplane
Year of Manufacture: 1980
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 425 S.A.
Landing Gear Type: Retractable - Tricycle
Date/Type of Last Inspection: August 9, 2019 100 hour 
Certified Max Gross Wt.: 11500 lbs
Time Since Last Inspection: 49 Hrs 
Engines: 2 Turbo prop
Airframe Total Time: 4723 Hrs at time of accident
Engine Manufacturer: Honeywell
ELT: Installed, not activated 
Engine Model/Series: TPE-33110511M
Registered Owner: 
Rated Power: 940 Horsepower
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: KOSH,782 ft msl 
Distance from Accident Site: 16 Nautical Miles
Observation Time: 08:53 Local 
Direction from Accident Site: 254°
Lowest Cloud Condition:
Visibility: 10 miles
Lowest Ceiling: Overcast / 2800 ft AGL 
Visibility (RVR):
Wind Speed/Gusts: / 
Turbulence Type Forecast/Actual: None / None
Wind Direction: 
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.2 inches Hg
Temperature/Dew Point: -4°C / -8°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: New Holstein, WI (8D1 )
Type of Flight Plan Filed: None
Destination: Chilton, WI (11Y )
Type of Clearance: None
Departure Time: 
Type of Airspace: Class G

Airport Information

Airport: Flying Feathers 11Y
Runway Surface Type: Grass/turf
Airport Elevation: 940 ft msl
Runway Surface Condition: Dry
Runway Used: 18 
IFR Approach: None
Runway Length/Width: 2500 ft / 85 ft
VFR Approach/Landing: Full stop

According to the pilot, the turf runway was 2,500 ft x 85 ft; publicly available information indicated the turf runway was 1,000 x 60 ft.

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries:
Aircraft Fire: None
Ground Injuries: N/A 
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 44.061111,-88.194999(est)

An examination of the airplane, which included engine rigging, propellers, and flight control continuity, did not reveal an anomaly that would have resulted in a directional control issue. 

Additional Information 

The flight manual contained landing distance information for a dry, hard surface runway. Landing distance information for a turf runway was not available to the pilot. Investigators calculated airplane landing performance based on ambient temperature, calm wind, zero runway slope, an airplane weight of 500 lbs above empty weight, flaps at 20 deg;, and no use of reverse thrust. Estimated landing distance over a 50 ft obstacle and ground roll were 2,500 and 1,500 ft, respectively. The airplane manufacturer estimated the landing distance over a 50 ft obstacle and ground roll for a turf (or wet) runway to be about 4,250 and 3,250 ft, respectively. The pilot did not respond to requests for additional information, such as expected landing distance, runway braking condition, touchdown location, actions taken after touchdown, and where the airplane departed the runway surface.

1 comment:

  1. "According to the pilot, the turf runway was 2,500 ft"

    That is what you get by using google map measurement. Puzzling that the official info shows 1000 ft.


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