ANC96LA004

NTSB accident investigation · Piper PA-18 · Tyonek, AK · October 7, 1995

Accident · No injuriesLimited investigationFinal report
Date
October 7, 1995, 14:00 local (22:00 UTC)
Place
Tyonek, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Other
Aircraft
N4463ZPiper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report April 29, 1996
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19951007036999A
Case key
2779

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

Improper planning/decision by the pilot concerning his method of testing the landing area. His selection of an unsuitable area was a related factor.

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.

Nose overOther
Planning/decision - improperPilot in commandCause
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandFactor
Terrain condition - snow covered

Analysis

The pilot was attempting to land on a snow covered mountain meadow. He estimated the depth of the snow to be 1 to 2 inches. Prior to landing, he attempted to drag the landing area by lightly touching the main gear on the landing surface. When the main gear touched the snow, the airplane nosed over. After exiting the airplane, the pilot noticed that the snow was 6 inches deep and very wet.

Factual narrative

On October 7, 1995, at 1400 Alaska daylight time, a wheel equipped Piper PA-18 airplane, N4463Z, registered to and operated by the pilot, nosed over while "dragging" the intended landing area. The accident occurred 15 miles south of Beluga Lake near Tyonek, Alaska. The personal flight, operating under 14 CFR Part 91, departed Lake Hood Airstrip, Anchorage, Alaska, and the destination was the intended landing area. No flight plan was filed and visual meteorological conditions prevailed. The private certificated pilot and his passenger were not injured and the airplane was substantially damaged.

During a telephone conversation with the pilot on October 10, 1995, he stated he was going to land near the snow line. Prior to landing he wanted to "drag" the landing area. When the wheels touched the snow the airplane nosed over immediately. The pilot stated the snow was deeper than he thought. The pilot defined "dragging" the strip as the intentional flight over the landing area and the touching down of the airplane's main wheels on the landing surface in an effort to determine the condition of the landing surface. The pilot stated that he thought the snow was one to two inches deep. After exiting the airplane he noticed that the snow was six inches deep and very wet.

Aircraft

Registration
N4463Z
Reported as
Piper PA-18
Category
Airplane
Serial number
18-8810
Airframe hours
1,936
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Dennis L. Griffith
Airworthiness certificate
Standard, Normal
Last inspection
Annual · August 7, 1995 · 32 hours before
Departed
LHD · Anchorage, AK
Destination
Beluga Lake, 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
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
433 total · 215 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 3 knots
Visibility
20 statute miles
Lowest ceiling
10,000 ft broken
Temperature
45 °F

FAA reports on this event · 1

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