ANC10TA028

NTSB accident investigation · Piper PA-18-150 · Stony River, AK · April 3, 2010

Accident · No injuriesFinal report
Date
April 2, 2010, 16:00 local (Apr 3, 2010, 00:00 UTC)
Place
Stony River, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Taxi
Aircraft
N82732Piper PA-18-150
Defining event
Taxi-from runway: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report July 1, 2010
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA FSDO-03
FAA report
20100403031149A
Case key
75567

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 of the airplane during taxi from landing, which resulted in the airplane sliding into trees.

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.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18-150: 98 casesAll aircraft: 3,958 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-18-150: 160 casesAll aircraft: 9,295 casesProbable cause

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 private pilot was on a public use wildlife patrol in a ski-equipped airplane when the accident occurred. The pilot reported that he landed on a frozen lake to make contact with the owner of a wilderness lodge, and that while taxiing from landing the airplane slid off the taxi area and into trees. The pilot said that he attempted to determine wind conditions on the ground and elected to land upslope to the east. He reported that his landing slide was longer than anticipated and he thought about going around. After almost coming to a stop, he said that he steered the airplane to the right edge of the landing area and attempted to use power to blow the tail of the airplane around; however, when he added power the skis failed to catch and the left wing struck a tree. Upon exiting the airplane he realized that he had landed downwind and that the wind appeared to be about 6 knots. The pilot did not report any mechanical anomalies with the airplane prior to the accident. The pilot noted substantial damage to both wings.

Factual narrative

On April 2, 2010, about 1600 Alaska daylight time, a ski-equipped Piper PA-18-150 airplane, N82732, sustained substantial damage when it collided with trees during taxi from landing on a frozen lake, about 30 miles east-southeast of Stony River, Alaska. The airplane was being operated by the State of Alaska, Department of Public Safety, as a visual flight rules (VFR)public use wildlife patrol under Title 14, CFR Part 91, when the accident occurred. The solo private pilot was not injured. The flight departed McCarthy, Alaska, about 1100. During a telephone conversation with the National Transportation Safety Board (NTSB) on April 5, a representative of the State of Alaska, said the pilot reported that he had landed on a frozen lake to make contact with the owner of a wilderness lodge. He said while taxiing from landing the airplane slid off the taxi area and into trees. The pilot reported substantial damage to both wings. In a written report dated April 6, the pilot wrote that after attempting to determine wind conditions on the ground he elected to land upslope to the east. He reported that his landing slide was longer than anticipated and he thought about going around, but did not. He continued that after almost coming to a stop he steered the airplane to the right edge of the landing area, and attempted to use power to blow the tail of the airplane around, and taxi to a safe area to park. He said when he added power to blow the tail around and turn to the right, the skies failed to catch and the left wing struck a tree causing the airplane to pivot to the left and the right wing struck another tree. The pilot said upon exiting the airplane he realized he had landed downwind, and the wind appeared to be about 6 knots from the west. The pilot did not report any mechanical anomalies with the airplane prior to the accident.

Aircraft

Registration
N82732
Reported as
Piper PA-18-150
Category
Airplane
Serial number
18-7709182
Airframe hours
6,316
Engine
Lycoming O-320 SERIES, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Public aircraft - state · Public use
Operator
State Of Alaska, doing business as Department of Public Safety
Registered owner
State Of Alaska
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 17, 2009
Departed
PAMC · McGrath, AK
Destination
Stony River, AK
Flight plan
Company VFR

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.

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None

Docket · 1

The files NTSB released with the investigation on April 15, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 601 KB 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.

Other investigations on N82732 · 1

Matched to the same aircraft by N-number and date.