Tuesday, February 28, 2017

Socata TBM700/A, C-GWVS: Accident occurred February 27, 2017 at Bellingham International Airport (KBLI), Whatcom County, Washington

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

NTSB Identification: GAA17CA158
14 CFR Part 91: General Aviation
Accident occurred Monday, February 27, 2017 in Bellingham, WA
Probable Cause Approval Date: 04/10/2017
Aircraft: SOCATA TBM700, registration: CGWVS
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot reported that, during the preflight, it was snowing, and he wiped the snow that had accumulated on the wings off “as best as [he] could.” He added that, while taxiing to the runway, “snow was falling heavily,” and he observed “light accumulation of wet snow” on the wings. During the takeoff roll, he observed the snow “sloughing off” the wings as the airspeed increased. 

Subsequently, during the climb to about 150 ft above the ground, the airplane yawed to the left, and he attempted to recover using right aileron. He reported that he “could see a stall forming,” so he lowered the nose and reduced power to idle. The airplane impacted the general aviation ramp in a left-wing-down attitude and slid 500 to 600 ft. 

The pilot reported on the National Transportation Safety Board Aircraft Accident/ Incident Report 6120.1 form that the airplane stalled, and he recommended “better deicing” before takeoff.

The airplane sustained substantial damage to the fuselage and left wing.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.

A review of recorded data from the automated weather observation station located on the airport revealed that, about 27 minutes before the accident, the wind was 010° at 8 knots, 1/2-mile visibility, moderate snow, freezing fog, and sky condition broken at 500 ft above ground level (agl) and overcast at 1,500 ft agl. The airplane departed from runway 16.

The Federal Aviation Administration (FAA) Aeronautical Information Manual stated, in part: “The presence of aircraft airframe icing during takeoff, typically caused by improper or no deicing of the aircraft being accomplished prior to flight has contributed to many recent accidents in turbine aircraft.”

The manual further stated, “Ensure that your aircraft’s lift-generating surfaces are COMPLETELY free of contamination before flight through a tactile (hands on) check of the critical surfaces when feasible. Even when otherwise permitted, operators should avoid smooth or polished frost on lift-generating surfaces as an acceptable preflight condition.”

FAA Advisory Circular, AC 135-17, stated in part: “Test data indicate that ice, snow, or frost formations having thickness and surface roughness similar to medium or course sandpaper on the leading edge and upper surfaces of a wing can reduce wing lift by as much as 30 percent and increase drag by 40 percent.”

Included in the public docket for this report is a copy of a service bulletin from the airplane manufacturer, which describes deicing and anti-icing ground procedures. It stated, in part: 

During conditions conducive to aeroplane icing during ground operations, take-off shall not be attempted when ice, snow, slush or frost is present or adhering to the wings, propellers, control surfaces, engine inlets or other critical surfaces. 

This is known as the “Clean Aircraft Concept”. Any deposit of ice, snow or frost on the external surfaces may drastically affect its performance due to reduced aerodynamic lift and increased drag resulting from the disturbed airflow.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The pilot’s failure to properly deice the airplane before takeoff, which resulted in an aerodynamic stall during the initial climb. 

Additional Participating Entity: 
Federal Aviation Administration / Flight Standards District Office: Seattle 

Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf 

NTSB Identification: GAA17CA158 
14 CFR Part 91: General Aviation
Accident occurred Monday, February 27, 2017 in Bellingham, WA
Aircraft: SOCATA TBM700, registration: CGVWS
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot reported that during the preflight it was snowing and he wiped the snow that had accumulated on the wings off "as best as [he] could". He added that while taxiing to the runway, "snow was falling heavily" and he observed "light accumulation of wet snow" on the wings. During the takeoff roll, he observed the snow "sloughing off" the wings as the airspeed increased. Subsequently, during the climb about 150 ft above the ground, the airplane yawed to the left, and he attempted to recover using right aileron. He reported that he "could see a stall forming" so he lowered the nose and reduced power to idle. The airplane impacted the general aviation ramp in a left wing down attitude and slid 500 to 600 ft.

The pilot reported on the National Transportation Safety Board Aircraft Accident/ Incident Report 6120.1 form that the airplane stalled and he recommended "better deicing" before takeoff.

The airplane sustained substantial damage to the fuselage and left wing.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.

A review of recorded data from the automated weather observation station, located on the airport, revealed that about 27 minutes before the accident the wind was 010° at 8 knots, ½ mile visibility; moderate snow, freezing fog, sky condition broken at 500 ft above ground level (agl) and overcast at 1,500 ft agl. The airplane departed runway 16.

The Federal Aviation Administration Aeronautical Information Manual (AIM) stated in part: "The presence of aircraft airframe icing during takeoff, typically caused by improper or no deicing of the aircraft being accomplished prior to flight has contributed to many recent accidents in turbine aircraft." The manual further stated: "Ensure that your aircraft's lift-generating surfaces are COMPLETELY free of contamination before flight through a tactile (hands on) check of the critical surfaces when feasible. Even when otherwise permitted, operators should avoid smooth or polished frost on lift-generating surfaces as an acceptable preflight condition."

The Federal Aviation Administration Advisory Circular, AC 135-17, stated in part: "Test data indicate that ice, snow, or frost formations having thickness and surface roughness similar to medium or course sandpaper on the leading edge and upper surfaces of a wing can reduce wing lift by as much as 30 percent and increase drag by 40 percent."

Included in the public docket for this report is a copy of a service bulletin from the airplane manufacturer, which describes de-icing and anti-icing ground procedures. It stated in part: 

"During conditions conducive to aeroplane icing during ground operations, take-off shall not be attempted when ice, snow, slush or frost is present or adhering to the wings, propellers, control surfaces, engine inlets or other critical surfaces. 

This is known as the "Clean Aircraft Concept". Any deposit of ice, snow or frost on the external surfaces may drastically affect its performance due to reduced aerodynamic lift and increased drag resulting from the disturbed airflow." 










A single-engine airplane crashed in a snowstorm at Bellingham International Airport, leaving a pilot with minor injuries around noon Monday.

Only one person was on board at 12:20 p.m. when the Socata TBM700/A plane tried to take off, said Mike Hogan, a spokesman for the Port of Bellingham.

For reasons that remain unclear, the aircraft crashed south of the main terminal, coming to a rest within feet of a pair of giant fuel tanks. The plane appeared to have serious damage to its propeller and left wing.

No details have been released about the pilot’s injuries.

Airport officials shut down the runway until further notice as Bellingham Fire Department crews started to clean up spilled fuel, Hogan said. All arriving and departing flights were grounded in the meantime.

As of Monday evening, the Port did not have an estimated time when flights would resume. Anyone waiting can check @FlyBLI on Twitter for the latest.

Federal investigators were inspecting the crash scene Monday. At the time of the crash visibility was low, about a quarter-mile, because of freezing fog and steady snowfall, according to the National Weather Service.

Crews were planning to remove up to 280 gallons of spilled aviation fuel, though that would be the worst-case scenario, said Larry Altose, a spokesman for the state Department of Ecology. So far there is no sign that fuel entered the storm water system.

Transport Canada records show the Winnipeg, Manitoba-based plane was built in 2003. It has been registered to its current owner for about 1 1/2 years.

Source:  http://www.bellinghamherald.com

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