ANC21LA085

NTSB accident investigation · Piper PA-12 · Tyonek, AK · September 6, 2021

Accident · No injuriesClass 4 · LimitedFinal report
Date
September 6, 2021, 13:30 local (21:30 UTC)
Place
Tyonek, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N149AKPiper PA-12
Defining event
Landing: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Alaska Regional Office
Parties
FAA
FAA report
20210906015399A
Case key
103846

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

On this page

Probable cause

The pilot’s selection of inappropriate terrain and decision to land with a tailwind, which resulted in a loss of directional control, an attempted go-around, and subsequent impact with terrain.

Findings · 5

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.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-12: 31 casesAll aircraft: 3,958 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Attain/maintain not possiblePiper PA-12: 6 casesAll aircraft: 1,310 cases
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-12: 51 casesAll aircraft: 9,295 casesProbable cause
Wind: tailwindEnvironmental issues › Conditions/weather/phenomena · Effect on operationPiper PA-12: 4 casesAll aircraft: 594 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 reported that he was landing off-airport, uphill, with a quartering tailwind. After touchdown, as the airplane began to slow, he began to have a loss of directional control. He attempted a go-around but had insufficient airspeed to attain an altitude to clear the approaching terrain. Subsequently, the airplane impacted the soft gravel terrain, the right main landing gear collapsed, and the airplane came to rest upright. A postaccident examination revealed substantial damage sustained to the right-wing spar. The pilot reported no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Aircraft

Registration
N149AK
Reported as
Piper PA-12
Category
Airplane
Serial number
121338
Built
1946
Airframe hours
4,010.5
Engine
Lycoming O-360-A4A, 180 hp, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 1, 2020
Departed
PAMR · Anchorage, AK
Equipment
ADS-B, Handheld GPS

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
48
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
March 2, 2021
Seat
Front
Flight hours
3,475 total · 260 in this make and model · 3,387 as pilot in command · 148 in the last 90 days · 50 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
240° at 6 knots
Visibility
10 statute miles
Temperature
57 °F, dew point 46 °F
Altimeter
29.90 inHg
Observed at
PAEN, 48 nm away
METAR
PAEN 062053Z 24006KT 10SM FEW030 14/08 A2990 RMK AO2 SLP127 T01440078 51013

FAA reports on this event · 1

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