ANC97LA140

NTSB accident investigation · Cessna U206F · King Salmon, AK · September 2, 1997

Accident · Minor injuriesLimited investigationFinal report
Date
September 1, 1997, 17:10 local (Sep 2, 1997, 01:10 UTC)
Place
King Salmon, AK
Injuries
1 minor, 2 uninjured
Damage
Destroyed
Phase of flight
Takeoff
Aircraft
N7032QCessna U206F
Weather
Visual (VMC) · Day
Status
Completed · report November 6, 1998
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19970901026819A
Case key
3061

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 selection of an unsuitable takeoff area. Factors were the sand bar and the pilot's failure to use all available waterway for the takeoff.

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 terrain/waterTakeoff - roll/run
Terrain condition - sand barFactor
Unsuitable terrain or takeoff/landing/taxi area - selectedPilot in commandCause
All available runway - not usedPilot in commandFactor
Nose overTakeoff - roll/run

Analysis

The pilot aborted the first takeoff attempt in the seaplane when the pilot seat slipped aft. He did not back taxi the seaplane prior to beginning the second takeoff run. A passenger's video depicts the seaplane on the step, a passenger commenting on the shallow water, and the seaplane striking a sandbar located in the middle of the river. The seaplane came to rest inverted in shallow water.

Factual narrative

On September 1, 1997, about 1710, a float equipped Cessna U206F airplane, N7032Q, sustained substantial damage when it nosed over in water on the Alagnak River, 38 miles northeast of King Salmon, Alaska. The airline transport certificated pilot and two passengers were uninjured. The airplane was operated by Hartley, Inc., doing business as Branch River Air Service, of Anchorage, Alaska. The flight was conducted under 14 CFR Part 135 as an on demand air taxi. Visual meteorological conditions prevailed at the time of the accident, and a company flight plan was filed.

Statements and a videotape taken by the passengers revealed that during the initial takeoff run, while on step, the pilot's seat slipped aft and he aborted the takeoff. He reset his seat, and did not water taxi the seaplane back to the original takeoff spot. The video depicts the seaplane beginning a second takeoff run, and the passengers can be heard commenting on the shallowness of the water. The seaplane then strikes a sandbar and noses over. This tape and overhead photographs show the seaplane inverted on a sandbar in shallow water.

Aircraft

Registration
N7032Q
Reported as
Cessna U206F
Category
Airplane
Serial number
U20603067
Airframe hours
8,556
Engine
Continental IO-520-F, 300 horsepower, reciprocating
Damage
Destroyed
Flight
Part 135
Registered owner
Hartley, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · August 28, 1997 · 15 hours before
Departed
AKN · AK
Destination
Alagnak River, 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
63
Certificates
Commercial, Airline transport
Airplane ratings
Single-engine land, Multi-engine sea, Single-engine sea, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
20,000 total · 400 in this make and model · 14,000 as pilot in command · 200 in the last 90 days · 100 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
20 statute miles
Lowest ceiling
None

Docket · 6

The files NTSB released with the investigation on June 11, 1998, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.6 MB in all.

FAA reports on this event · 1

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