# NTSB ANC16CA053: Cessna U206G, N206JC, Sleetmute, AK, July 31, 2016 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: July 31, 2016, 09:00 local (17:00 UTC) - Place: Sleetmute, AK - Coordinates: 61.661666, -157.145278 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=61.6617&lon=-157.1453&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff: Loss of control in flight](https://openairdocs.org/ntsb-events/240) - Highest injury: No injuries - Injuries: 5 uninjured - Status: Completed, report March 13, 2017 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA - NTSB case key (mKey): 93786 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC16CA053 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/93786/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=93786 - Page: https://openairdocs.org/ntsb/ANC16CA053 ## 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 NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Cessna U206G, 13 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2073356), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Performance/control parameters: airspeed](https://openairdocs.org/ntsb-findings/01062010): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Cessna U206G, 2 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md?model=2073356), [All aircraft, 1,681 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md) - [Performance/control parameters: angle of attack](https://openairdocs.org/ntsb-findings/01062042): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Cessna U206G, 1 case](https://openairdocs.org/ntsb-findings/01062042/cases.md?model=2073356), [All aircraft, 990 cases](https://openairdocs.org/ntsb-findings/01062042/cases.md) - [Runway/land/takeoff/taxi surface: wet surface](https://openairdocs.org/ntsb-findings/03023010): Environmental issues › Physical environment · Effect on operation; cases with it: [Cessna U206G, 1 case](https://openairdocs.org/ntsb-findings/03023010/cases.md?model=2073356), [All aircraft, 141 cases](https://openairdocs.org/ntsb-findings/03023010/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Takeoff: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [Cessna U206G, 4 cases](https://openairdocs.org/ntsb-events/240/sequence.md?model=2073356), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md) - [Takeoff: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna U206G, 16 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2073356), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## 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](https://openairdocs.org/deregistered/N206JC-2019-02-07), registration cancelled 2019-02-07, S/N U20605765, built 1980 (OpenAirDocs) - Reported make and model: CESSNA U206G - Registry model: [Cessna U206G](https://openairdocs.org/model/cessna-u206g) (registry code 2073356) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: U20605765 - Year built: 1980 - Engines: 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 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 65; injuries: none; 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 ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20160731012719A](https://openairdocs.org/incident/20160731012719A), Jul 31, 2016: Cessna U206G, Sleetmute, AK, Substantial damage. While attempting a short field takeoff at a remote grass strip, the aircraft appears to have stalled, causing a loss of control and a subsequent crash. The… ## Docket (3 files) The files NTSB released with the investigation on January 24, 2017, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=93786. 1.4 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 775 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40448632&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Witness Statements (item 2, .PDF, 92 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40448633&FileExtension=.PDF&FileName=Witness%20Statements-Master.PDF - Photos (item 3, .PDF, 534 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40448634&FileExtension=.PDF&FileName=Photos-Master.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.