ANC99LA131

NTSB accident investigation · Piper PA-12 · Skwentna, AK · August 31, 1999

Accident · No injuriesLimited investigationFinal report
Date
August 31, 1999, 14:30 local (22:30 UTC)
Place
Skwentna, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N3824MPiper PA-12
Weather
Visual (VMC) · Day
Status
Completed · report August 14, 2001
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19990831025389A
Case key
47326

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 inadequate compensation for wind conditions. Factors in the accident were a crosswind, and wind gusts.

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 weatherLanding - roll
Weather condition - crosswindFactor
Compensation for wind conditions - inadequatePilot in commandCause
In flight collision with terrain/waterLanding - aborted
Terrain condition - mountainous/hilly

Analysis

The commercial certificated pilot/hunting guide was landing at a remote airstrip located on a mountain ridge with an assistant guide. The purpose of the flight was to establish a camp for his hunting clients. The landing strip is oriented north/south at 3,500 feet msl, and is 850 feet long, and 30 feet wide. The pilot had landed on the ridge numerous times in the past. The pilot said he made several low passes over the area to assess the landing area and wind conditions. During the low passes over the ridge, he noted a quartering head wind from the right, of 10 miles per hour. He said he landed on the ridge, but just after touchdown, encountered a wind gust that pushed the airplane to the left. He added engine power to abort the landing. The tailwheel came off the ground, and he turned the airplane downhill to the left to gain airspeed. The right wing, and the main tires struck the ground on the downhill side of the ridge. The airplane received damage to the landing gear, and the right wing spar.

Factual narrative

On August 31, 1999, about 1430 Alaska daylight time, a tundra tire equipped Piper PA-12 airplane, N3824M, sustained substantial damage while landing at a remote area, about 53 miles west of Skwentna, Alaska, at latitude 62 degrees, 03.978 minutes north, and longitude 153 degrees, 03.011 minutes west. The airplane was being operated as a visual flight rules (VFR) local area positioning flight under Title 14 CFR Part 91 when the accident occurred. The airplane was operated by the pilot, a hunting guide doing business as High Country Alaska. The commercial certificated pilot, and the sole passenger, an assistant guide with the company, were not injured. Visual meteorological conditions prevailed. VFR company flight following procedures were in effect.

The accident was reported by another airplane pilot flying over the area.

On September 4, 1999, during a telephone conversation with a National Transportation Safety Board (NTSB) investigator, the pilot reported he was planning to land on a ridge with his assistant guide to establish a camp for his hunting clients. He said the landing area is oriented north/south at 3,500 feet msl in the Ptarmigan Pass area of the Alaska Mountain Range, and that he had landed on the ridge numerous times in the past. He said he made several low passes over the area to assess the landing area and wind conditions. During the low passes over the ridge, he noted a quartering wind from the northeast of 10 miles per hour with no wind gusts. He said he landed on the ridge, but just after touchdown, encountered a wind gust that pushed the airplane to the left. He added engine power to abort the landing. He said the tailwheel came off the ground, and he turned the airplane downhill to gain airspeed, but the right wing, and main tires struck the ground on the downhill side of the ridge. The airplane received damage to the landing gear, and the right wing spar.

Aircraft

Registration
N3824M
Reported as
Piper PA-12
Category
Airplane
Serial number
12-2744
Airframe hours
4,100
Engine
Lycoming O-320, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Positioning · Part 91
Registered owner
Jeffory K. Pralle
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · July 31, 1999 · 100 hours before
Departed
Hartman River, AK
Flight plan
Company VFR
Airport
runway 36, 850 × 30 ft, dirt

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
34
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Center
Flight hours
1,600 total · 350 in this make and model · 1,500 as pilot in command · 200 in the last 90 days · 150 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
45° at 6 knots
Visibility
25 statute miles
Lowest ceiling
1,000 ft overcast
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.

Other investigations on N3824M · 2

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