Friday, March 16, 2018

CubCrafters CC11-160, N473CC: Accident occurred March 16, 2018 at Mammoth Yosemite Airport (KMMH), Mono County, California

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Reno, Nevada

Aviation Accident Final Report - National Transportation Safety Board:

Investigation Docket - National Transportation Safety Board:

Location: Mammoth Lakes, CA
Accident Number: GAA18CA169
Date & Time: 03/16/2018, 0110 PDT
Registration: N473CC
Aircraft: CUBCRAFTERS INC CC11-160
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 tundra tire and tailwheel-equipped airplane was making a night landing at a high-altitude airport. He reported that, to mitigate the crosswind component, he decided to land from right to left on the 100-foot-wide runway. He added that the wheel landing was normal, but the airplane would not return to centerline from the left side of the runway. He added power to go around, but the left main wheel sheared off, and the airplane ground looped to the right.

The airplane sustained substantial damage to the fuselage and empennage.

A review of recorded data from the automated weather observation station located on the airport reported that, about the time of the accident, the wind was from 220° at 19 knots, gusting 31 knots. The airplane landed on runway 27.

The airplane's operating handbook stated that the maximum demonstrated crosswind component was 13 mph/11 knots. The calculated crosswind component using steady winds is 15 knots, using gust winds is 24 knots.

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 a gusting crosswind conditions, which exceeded the airplane's maximum demonstrated crosswind and resulted in the collapse of the left main landing gear. 


Directional control - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Environmental issues
Gusts - Ability to respond/compensate
Crosswind - Ability to respond/compensate
Dark - Effect on operation

Factual Information

History of Flight

Other weather encounter

Landing-aborted after touchdown
Loss of control on ground (Defining event)

Landing gear collapse

Pilot Information

Certificate: Private
Age: 53, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Front
Other Aircraft Rating(s): Helicopter
Restraint Used: 4-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 Without Waivers/Limitations
Last FAA Medical Exam: 04/26/2016
Occupational Pilot: No
Last Flight Review or Equivalent: 04/26/2017
Flight Time:  (Estimated) 1480.3 hours (Total, all aircraft), 300.8 hours (Total, this make and model), 1137.9 hours (Pilot In Command, all aircraft), 55.1 hours (Last 90 days, all aircraft), 21 hours (Last 30 days, all aircraft), 3.3 hours (Last 24 hours, all aircraft) 

Aircraft and Owner/Operator Information

Aircraft Manufacturer: CUBCRAFTERS INC
Registration: N473CC
Model/Series: CC11-160 NO SERIES
Aircraft Category: Airplane
Year of Manufacture: 2013
Amateur Built: No
Airworthiness Certificate: Experimental Light Sport
Serial Number: CC11-00254
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 12/11/2017, Annual
Certified Max Gross Wt.: 1320 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 310.8 Hours at time of accident
Engine Manufacturer: TITAN
ELT: Installed, activated, did not aid in locating accident
Engine Model/Series: CC340
Rated Power: 180 hp
Operator: On file
Operating Certificate(s) Held:  None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Night/Bright
Observation Facility, Elevation: KMMH, 7128 ft msl
Observation Time: 0815 UTC
Distance from Accident Site: 1 Nautical Miles
Direction from Accident Site: 308°
Lowest Cloud Condition: Clear
Temperature/Dew Point: 0°C / -15°C
Lowest Ceiling: None
Visibility:  10 Miles
Wind Speed/Gusts, Direction: 19 knots/ 31 knots, 220°
Visibility (RVR):
Altimeter Setting:  29.81 inches Hg
Visibility (RVV):
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: BISHOP, CA (BIH)
Type of Flight Plan Filed: None
Destination: Mammoth Lakes, CA (MMH)
Type of Clearance: None
Departure Time: 0040 PST
Type of Airspace: Class E

Airport Information

Runway Surface Type: Asphalt
Airport Elevation: 7134 ft
Runway Surface Condition: Dry
Runway Used: 27
IFR Approach: None
Runway Length/Width: 7000 ft / 100 ft
VFR Approach/Landing: Go Around; Straight-in 

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:  37.622500, -118.833056 (est)

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