ANC87FA140

NTSB accident investigation · Lake LA-4-200 · Coal Lake, AK · September 5, 1987

Accident · FatalField investigationFinal report
Date
September 5, 1987, 15:23 local (23:23 UTC)
Place
Coal Lake, AK
Injuries
1 fatal, 3 serious
Damage
Destroyed
Phase of flight
Takeoff
Aircraft
N39450Lake LA-4-200
Weather
Visual (VMC) · Day
Status
Completed · report November 8, 1988
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19870905050029A
Case key
4788

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

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.

Loss of control - on ground/waterTakeoff - roll/run
Maneuver - improperPilot in commandCause
Lack of total experience in type of aircraftPilot in commandFactor
Abrupt maneuverTakeoff - roll/run
Throttle/power control - inadvertent usePilot in commandCause
Directional control - not possiblePilot in commandCause
Nose overTakeoff - roll/run

Analysis

The pilot of the airplane stated that he had step-taxied to the east end of the lake in preparation for a takeoff to the west. During the take off run, the airplane struck the wake he had just created and became prematurely airborne. He reduced power in an attempt to make a full stall landing, but struck the water hard and was thrown forward. As he was thrown forward, he inadvertedly pushed the throttle to maximum. The airplane slewed sideways and turned inverted. The pilot and one passenger escaped without difficulty, but the pilot had to dive under the airplane and cut the other two passengers from their retraints. One of these passengers later died from her injuries.

Aircraft

Registration
N39450
Reported as
Lake LA-4-200
Category
Airplane
Serial number
540
Engine
Lycoming IO-360, 200 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Operator
John A. Steeby
Registered owner
John A Steeby
Airworthiness certificate
Standard, Normal
Last inspection
Annual · April 16, 1987 · 27 hours before
Departed
Coal Lake, AK
Destination
Z15 · Birchwood, 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
57
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
503 total · 136 in this make and model · 360 as pilot in command · 27 in the last 90 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
30 statute miles
Temperature
55 °F

FAA reports on this event · 1

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