ANC96LA009

NTSB accident investigation · Piper PA-18-150 · Anchorage, AK · October 25, 1995

Accident · No injuriesLimited investigationFinal report
Date
October 24, 1995, 17:45 local (Oct 25, 1995, 01:45 UTC)
Place
Anchorage, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N2399SPiper PA-18-150
Weather
Visual (VMC) · Day
Status
Completed · report April 29, 1996
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19951024037119A
Case key
2784

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 the wind conditions, and failure to maintain sufficient altitude/clearance from mountainous/hilly 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.

In flight encounter with weatherCruise
Terrain condition - high terrainFactor
Weather condition - downdraftFactor
In flight collision with terrain/waterCruise
Compensation for wind conditions - inadequatePilot in commandCause
Terrain condition - mountainous/hilly
Altitude/clearance - not maintainedPilot in commandCause

Analysis

The pilot was on a local flight and was returning to Lake Hood Seaplane Base. He stated that as he approached a local pass (named Powerline Pass), the airplane encountered a downdraft. He was unable to stop the descent and the airplane crashed into the terrain on the east side of the pass. Local area winds in the valley, 12 miles west of the accident site, were from the north at 5 knots. The pilot could not estimate the winds in the pass.

Factual narrative

On October 24, 1995, at 1745 Alaska daylight time, a float equipped Piper PA-18-150 airplane, N2399S, registered to the pilot's father, and operated by the pilot, experienced a downdraft while attempting to fly through "Powerline Pass" which is located 12 miles east of Anchorage, and crashed into the east side of the pass. The personal flight, operating under 14 CFR Part 91, last departed Lake Hood Seaplane Base, Anchorage, Alaska, for a local flight. No flight plan was filed and visual meteorological conditions prevailed. The certificated airline transport pilot, the sole occupant, was not injured and the airplane received substantial damage.

During a telephone conversation with the pilot on October 25, 1995, he stated that he was attempting to cross through the pass east to west. As he neared the pass, a severe downdraft started to push the airplane toward the ground. He was unable to recover and the airplane struck the ground. The pilot could not estimate the winds at the accident site. The Lake Hood Automatic Terminal Information System (ATIS)information showed that the airport winds were from the north at 5 knots. There were no weather or wind reporting facilities near the pass.

Aircraft

Registration
N2399S
Reported as
Piper PA-18-150
Category
Airplane
Serial number
18-7909143
Airframe hours
1,800
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Geoff Stearn
Registered owner
George K. Stearn
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 30, 1995 · 75 hours before
Departed
LHD · 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
39
Certificates
Flight engineer, Airline transport, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
4,000 total · 1,000 in this make and model · 3,200 as pilot in command · 150 in the last 90 days · 50 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Visibility
40 statute miles
Lowest ceiling
2,000 ft overcast
Temperature
32 °F

FAA reports on this event · 1

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