ANC93LA174

NTSB accident investigation · Cessna 206 · Swikshak Bay, AK · September 12, 1993

Accident · FatalLimited investigationFinal report
Date
September 11, 1993, 16:05 local (Sep 12, 1993, 00:05 UTC)
Place
Swikshak Bay, AK
Injuries
1 fatal, 4 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N9707ZCessna 206
Weather
Visual (VMC) · Day
Status
Completed · report October 20, 1994
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19930911033879A
Case key
2426

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-in-command's failure to attain a proper climb rate.

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 collision with terrain/waterTakeoff - initial climb
Proper climb rate - not attainedPilot in commandCause
Stall/mush - encounteredPilot in commandCause
Nose overLanding - flare/touchdown
Terrain condition - sand bar

Analysis

The pilot-in-command stated two other airplanes took off from the slough just before him. He was the last to depart and made his takeoff run downstream on the slough. He lifted off at 50 to 55 knots and the airplane began to settle just after lift off. The pilot stated he knew the water was very shallow and tried to maintain flight until reaching deeper water. The airplane settled onto the slough and the floats struck a mud bar and the airplane nosed over. The wind was calm. The pilot stated there were no mechanical irregularities during the takeoff. This was a business flight conducted under 14CFR91 by a fishing lodge.

Factual narrative

On September 11, 1993, at 1605 Alaska daylight time, a float equipped Cessna 206 airplane, N9707Z, registered to and operated by Fishing Unlimited Lodge of Port Alsworth, Alaska, crashed after takeoff and nosed over on a mud bar. The business flight, operating under 14 CFR Part 91, was departing a slough in Swikshak Bay located on the west side of Sheilikof Straits, and the destination was Port Alsworth. A company flight plan was in effect and visual meteorological conditions prevailed. The commercial certificated Pilot-in-Command and three passengers received minor injuries, and one passenger received fatal injuries. The airplane was substantially damaged.

According to the Pilot-in-Command, he was taking off down river on the slough and there was no perceptible wind on the surface of the slough or the surrounding lakes. He stated he lifted off at 50 to 55 knots and the airplane began to settle shortly after lift off. He attempted to keep the airplane aligned with the channel of the slough so he would not hit a mud bar. The airplane touched down in shallow water, hit a mud bar, and nosed over.

The Pilot-in-Command stated that two other company airplanes took off just before. They encountered no problems and each stated the wind was negligible.

The airplane crashed in the slough and was resting in very shallow water. The Emergency Locator Antenna was located on the top of the airplane. The antenna broke off when the airplane nosed over. The airplane's radios were immersed in water and would not operate.

The passenger who was fatally injured was seated in the rear most seat of the airplane. The distance between the cabin floor and the cabin ceiling decreases rearward through airplane. An NTSB Investigator seated in the rearmost seat had only 2 inches of clearance between the ceiling and the top of his head. The autopsy results showed the passenger received a basilar skull fracture. According to the Pilot-in-Command, he performed CPR on the passenger on three different occasions while simultaneously attempting to radio for assistance. There were three other passengers who received only minor injuries.

Aircraft

Registration
N9707Z
Reported as
Cessna 206
Category
Airplane
Serial number
U20606617
Airframe hours
3,545
Engine
Continental IO-520-F, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Business · Part 91
Operator
Fishing Unlimited
Registered owner
Fishing Unlimited
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 21, 1993 · 231 hours before
Destination
Port Alsworth, AK
Flight plan
Company VFR

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
43
Certificates
Military, Flight instructor, Commercial
Airplane ratings
Multi-engine land, Single-engine land, Single-engine sea
Instrument ratings
Airplane, Helicopter
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
4,300 total · 200 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
4,000 ft broken
Temperature
39 °F

FAA reports on this event · 1

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