Sunday, September 05, 2021

Loss of Control on Ground: Cessna 208B Caravan, N186GC; accident occurred September 07, 2020 at Grand Canyon Bar 10 Airport (1Z1), Whitmore, Mohave County, Arizona

Aviation Accident Final Report - National Transportation Safety Board

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Las Vegas

Investigation Docket - National Transportation Safety Board:

Zuni LLC

Location: Whitmore, Arizona
Accident Number: WPR20CA298
Date & Time: September 7, 2020, 13:00 Local
Registration: N186GC
Aircraft: Cessna 208
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 8 None
Flight Conducted Under: Part 135: Air taxi & commuter - Scheduled


The pilot reported that during the landing ground roll, the airplane started to veer left. He applied right rudder input, but the airplane continued to “drag” left. As the pilot repositioned his feet from the pedals to the brakes, the airplane continued to veer left, exited the runway, and impacted terrain. The right wing was substantially damaged.

An examination of the left wheel and tire assembly revealed no anomalies. The operator’s Director of Maintenance reported that there were no preimpact mechanical malfunctions or failures 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 loss of directional control during landing, which resulted in a runway excursion and impact with terrain.


Aircraft Directional control - Not attained/maintained
Personnel issues Aircraft control - Pilot

Factual Information

History of Flight

Landing-landing roll Loss of control on ground (Defining event)
Landing-landing roll Runway excursion
Landing-landing roll Collision with terr/obj (non-CFIT)

Pilot Information

Certificate: Commercial
Age: 57, Male
Airplane Rating(s): Single-engine land; Multi-engine land
Seat Occupied: Left
Other Aircraft Rating(s): None 
Restraint Used: 5-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: April 30, 2020
Occupational Pilot: Yes
Last Flight Review or Equivalent: August 25, 2020
Flight Time: (Estimated) 1460 hours (Total, all aircraft), 600 hours (Total, this make and model), 1210 hours (Pilot In Command, all aircraft), 216 hours (Last 90 days, all aircraft), 70 hours (Last 30 days, all aircraft), 3 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Cessna 
Registration: N186GC
Model/Series: 208B
Aircraft Category: Airplane
Year of Manufacture: 2009 
Amateur Built:
Airworthiness Certificate: Normal 
Serial Number: 208B2161
Landing Gear Type: Tricycle
Seats: 10
Date/Type of Last Inspection: August 22, 2020 AAIP 
Certified Max Gross Wt.: 8750 lbs
Time Since Last Inspection: 35.8 Hrs 
Engines: 1 Turbo prop
Airframe Total Time: 8044.3 Hrs at time of accident
Engine Manufacturer: Pratt & Whitney Canada
ELT: C126 installed, activated, did not aid in locating accident
Engine Model/Series: PT6A-114A
Registered Owner: 
Rated Power: 675 Horsepower
Operating Certificate(s) Held: On-demand air taxi (135)

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual (VMC)
Condition of Light: Day
Observation Facility, Elevation: KAZC,4874 ft msl
Distance from Accident Site: 43 Nautical Miles
Observation Time: 12:35 Local 
Direction from Accident Site: 14°
Lowest Cloud Condition: Clear
Visibility: 10 miles
Lowest Ceiling: None 
Visibility: (RVR):
Wind Speed/Gusts: 6 knots / 14 knots 
Turbulence Type Forecast/Actual: None / None
Wind Direction: 350°
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.02 inches Hg
Temperature/Dew Point: 39°C / 0°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Boulder City, NV (KBVU)
Type of Flight Plan Filed:
Destination: Whitmore, AZ
Type of Clearance: None
Departure Time: 12:10 Local 
Type of Airspace: Class G

Airport Information

Airport: Grand Canyon Bar Ten Airstrip 1Z1
Runway Surface Type: Asphalt
Airport Elevation: 4100 ft msl
Runway Surface Condition: Dry
Runway Used: 34
IFR Approach: None
Runway Length/Width: 4600 ft / 40 ft
VFR Approach/Landing: Full stop; Traffic pattern

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 7 None 
Aircraft Fire: None
Ground Injuries: 
Aircraft Explosion: None
Total Injuries: 8 None 
Latitude, Longitude: 36.256389,-113.23083 (est)

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