Sunday, May 05, 2019

Loss of Control on Ground: Piper PA-18-150 Super Cub, N4165Z; accident occurred August 15, 2018 at Tyonek Airport (TYE), Alaska

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Juneau, Alaska

Aviation Accident Final Report - National Transportation Safety Board:

Investigation Docket - National Transportation Safety Board:

Aviation Accident Data Summary - National Transportation Safety Board:

Location: Tyonek, AK
Accident Number: GAA18CA520
Date & Time: 08/15/2018, 1400 AKD
Registration: N4165Z
Aircraft: Piper PA18
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Personal 


The pilot in the tailwheel-equipped airplane reported that, before landing on the narrow, gravel airstrip, the airplane encountered a wind gust from the right that "pushed me to the left a few feet." The airplane's left wing contacted brush on the left side of the airstrip, and the airplane then exited the left side of the airstrip. The airplane descended into a 2-ft-deep ditch and stopped.

The airplane sustained substantial damage to the left wing spar.

The pilot reported that the wind conditions were variable and gusting to 8 knots, that the skies were clear, and that the visibility exceeded 10 miles.

The pilot reported that there were no mechanical malfunctions or failures 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 directional control during landing in gusting wind conditions.


Directional control - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Environmental issues
Tree(s) - Contributed to outcome

Factual Information

History of Flight

Other weather encounter

Landing-landing roll
Loss of control on ground (Defining event)

Collision with terr/obj (non-CFIT)
Runway excursion

Pilot Information

Certificate: Private
Age: 33, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Front
Other Aircraft Rating(s):None 
Restraint Used: 3-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 With Waivers/Limitations
Last FAA Medical Exam: 07/13/2016
Occupational Pilot: No
Last Flight Review or Equivalent: 01/20/2018
Flight Time:  (Estimated) 149.8 hours (Total, all aircraft), 64.8 hours (Total, this make and model), 117 hours (Pilot In Command, all aircraft), 36.4 hours (Last 90 days, all aircraft), 12.2 hours (Last 30 days, all aircraft), 1.8 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Piper
Registration: N4165Z
Model/Series: PA18 150
Aircraft Category: Airplane
Year of Manufacture: 1965
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 18-8346
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 02/03/2018, Annual
Certified Max Gross Wt.: 1750 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 16170 Hours as of last inspection
Engine Manufacturer: Lycoming
ELT: C126 installed, not activated
Engine Model/Series: O-320
Registered Owner: On file
Rated Power:150 hp 
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: PALV, 60 ft msl
Distance from Accident Site: 14 Nautical Miles
Observation Time:2253 UTC 
Direction from Accident Site: 344°
Lowest Cloud Condition: Scattered / 4000 ft agl
Visibility: 10 Miles
Lowest Ceiling:
Visibility (RVR):
Wind Speed/Gusts: Light and Variable /
Turbulence Type Forecast/Actual: /
Wind Direction: Variable
Turbulence Severity Forecast/Actual: /
Altimeter Setting: 29.94 inches Hg
Temperature/Dew Point: 15°C / 7°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Soldotna, AK (PASX)
Type of Flight Plan Filed: None
Destination: Soldotna, AK (PASX)
Type of Clearance: None
Departure Time: 1200 AKD
Type of Airspace: Class G 

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: 60.588889, -152.161944 (est)

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