ANC00LA028

NTSB accident investigation · Piper PA-18 · Willow, AK · February 17, 2000

Accident · No injuriesLimited investigationFinal report
Date
February 17, 2000, 11:30 local (15:30 UTC)
Place
Willow, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N7164BPiper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report December 4, 2000
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20000217042069A
Case key
48737

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 selection of unsuitable terrain for landing. Factors in the accident were soft, snow covered terrain.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

On ground/water encounter with terrain/waterLanding - roll
Terrain condition - snow coveredFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
Terrain condition - softFactor
Nose overLanding - roll

Analysis

The commercial certificated pilot was landing a tundra tire equipped airplane at a remote area next to a frozen river. The pilot had landed at the same location the previous day to assist his passenger in locating a lost snow machine. Overnight, about 4 to 6 inches of snow fell in the area. On the accident date, the pilot landed in his tracks from the previous day. During the landing roll, the new snow layer slowed the airplane dramatically, and the airplane nosed over. The airplane received damage to the vertical stabilizer, the rudder, and the left wing lift strut.

Factual narrative

On February 17, 2000, about 1130 Alaska standard time, a tundra tire equipped Piper PA-18 airplane, N7164B, sustained substantial damage during landing at a remote area, about 20 miles west-southwest of Willow, Alaska, at latitude 61 degrees, 47.60 minutes north, and longitude 150 degrees, 43.17 minutes west. The airplane was being operated as a visual flight rules (VFR) local area personal flight when the accident occurred. The airplane was operated by the pilot. The commercial certificated pilot, and the sole passenger, were not injured. Visual meteorological conditions prevailed. The flight originated at the Birchwood Airport, Chugiak, Alaska, about 1100.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on February 18, 2000, the pilot reported he landed along the Yentna River the previous day to assist the passenger in locating a lost snow machine. Overnight, about 4 to 6 inches of snow fell in the area. On the accident date, the pilot landed in his tracks from the previous day. During the landing roll, he said the new snow layer slowed the airplane dramatically, and the airplane nosed over. The airplane received damage to the vertical stabilizer, the rudder, and the left wing lift strut.

Aircraft

Registration
N7164B
Reported as
Piper PA-18
Category
Airplane
Serial number
18-5190
Airframe hours
5,026
Engine
Lycoming O-320-A2B, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Larry D. Nicholson
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 6, 1999 · 59 hours before
Departed
PABV · Chugiak, AK

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
53
Certificates
Flight instructor, Commercial
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
3,867 total · 2,887 in this make and model · 3,867 as pilot in command · 17 in the last 90 days · 5 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
3 statute miles
Lowest ceiling
1,500 ft broken
Temperature
19 °F

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 N7164B · 2

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