ANC16CA053

NTSB accident investigation · Cessna U206G · Sleetmute, AK · July 31, 2016

Accident · No injuriesData collectionFinal report
Date
July 31, 2016, 09:00 local (17:00 UTC)
Place
Sleetmute, AK
Injuries
5 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N206JCCessna U206G
Defining event
Takeoff: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report March 13, 2017
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA
FAA report
20160731012719A
Case key
93786

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 failure to maintain adequate airspeed during the initial climb after taking off from a wet runway and his exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotCessna U206G: 13 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna U206G: 2 casesAll aircraft: 1,681 casesProbable cause
Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna U206G: 1 caseAll aircraft: 990 casesProbable cause
Runway/land/takeoff/taxi surface: wet surfaceEnvironmental issues › Physical environment · Effect on operationCessna U206G: 1 caseAll aircraft: 141 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot stated that he was attempting a takeoff from an unimproved, wet airstrip with four passengers on board when the tricycle-geared airplane began to hydroplane, followed by a ground loop, which resulted in substantial damage to the airplane's left wing and tail. A passenger stated that, after taxiing to the end of the runway and turning around, the pilot began the takeoff roll. After becoming airborne, the airplane immediately turned right, then left, then impacted the trees on the left side of the runway. Following the initial impact, the airplane began to travel backward through the trees. Photographs of the airplane taken immediately following the accident by the passenger show the flaps in the retracted position, the right main landing gear box protruding through the floorboard of the airplane, and substantial damage to the left wing and fuselage, just aft of the rear window.

Factual narrative

The pilot stated that he was attempting a takeoff from an unimproved, wet airstrip with four passengers on board, when the tricycle-geared airplane began to hydroplane, leading to a ground loop that resulted in substantial damage to the left wing and tail of the airplane. A passenger from the flight stated that after taxiing to the end of the runway and turning around, the pilot began the takeoff roll. After becoming airborne, the airplane immediately turned right, then left, then impacted the trees on the left side of the runway. Following the initial impact, the airplane began to travel backwards through the trees. Photographs of the airplane taken immediately following the accident by the passenger show the flaps in the retracted position, the right main landing gear box protruding through the floorboard of the airplane and substantial damage to the left wing and fuselage, just aft of the rear window.

Aircraft

Registration
N206JC
Reported as
Cessna U206G
Category
Airplane
Serial number
U20605765
Built
1980
Engine
Continental O-550 SERIES, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Business · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Unknown · June 1, 2016
Departed
SLQ · Sleetmute, AK
Destination
SLQ · Sleetmute, AK
Flight plan
Unknown
Airport
SLQ · Sleetmute
Equipment
Stall warning system

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
65
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Single-engine sea
Medical
Class 2, With waivers/limitations
Seat
Left
Restraint
3-point
Flight hours
20,000 total · 3,500 in this make and model · 20,000 as pilot in command · 300 in the last 90 days · 125 in the last 30 days · 0 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
5 statute miles
Lowest ceiling
1,300 ft broken
Temperature
55 °F, dew point 54 °F
Altimeter
30.03 inHg
Observed at
SLQ, 3 nm away

Docket · 3

The files NTSB released with the investigation on January 24, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.4 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.