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NTSB accident investigation · Piper PA18 · Tyonek, AK · August 15, 2018

Accident · No injuriesData collectionFinal report
Date
August 15, 2018, 14:00 local (22:00 UTC)
Place
Tyonek, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N4165ZPiper PA18
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report June 10, 2019
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20180815014269A
Case key
98202

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot’s failure to maintain directional control during landing in gusting wind conditions.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-18-150: 160 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18-150: 98 casesAll aircraft: 3,958 casesProbable cause
Object/animal/substance: tree(s)Environmental issues › Physical environment · Contributed to outcomePiper PA-18-150: 19 casesAll aircraft: 933 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

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.

Factual narrative

The pilot in the tailwheel-equipped airplane reported that prior to landing on the narrow, gravel surface airstrip, the airplane encountered a gust of wind from the right that "pushed me to the left a few feet." The airplane's left wing contacted the brush on the left side of the airstrip and the airplane exited the left side of the runway. The airplane descended a 2-foot ditch and stopped. The airplane sustained substantial damage to the left wing spar. The pilot reported that the wind condition was variable and gusting to 8 knots. Additionally, he reported 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.

Aircraft

Registration
N4165Z
Reported as
Piper PA18 (150)
Category
Airplane
Serial number
18-8346
Built
1965
Airframe hours
16,170
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · February 3, 2018
Departed
PASX · Soldotna, AK
Destination
PASX · Soldotna, AK
Equipment
Electronic flight bag or handheld device

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
33
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
January 20, 2018
Seat
Front
Restraint
3-point
Flight hours
149.8 total · 64.8 in this make and model · 117 as pilot in command · 36.4 in the last 90 days · 12.1 in the last 30 days · 1.7 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Temperature
59 °F, dew point 45 °F
Altimeter
29.94 inHg
Observed at
PALV, 14 nm away

Docket · 2

The files NTSB released with the investigation on April 17, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.5 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.