Textron Aviation Inc 208B accident near Snohomish, WA

On November 18, 2022, a Textron Aviation Inc 208B (airplane) was involved in an accident near Snohomish, WA. 4 people died. Damage to the aircraft: substantial.

Date
November 18, 2022
Place
Snohomish, WA
Aircraft
Textron Aviation Inc 208B · Airplane
Injuries
4 fatal, 0 serious, 0 minor
Damage
Substantial
Position
47.906°N, 122.049°W
NTSB ID
20221118106317

Official records · WPR23FA034

NTSB summary

HISTORY OF FLIGHTOn November 18, 2022, at 1019 Pacific standard time, a Textron Aviation 208B, N2069B, was substantially damaged when it was involved in an accident near Snohomish, Washington. The two airline transport pilots and two flight test crewmembers were fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 test flight. The operator, Raisbeck Engineering, held the STC for an aerodynamic drag reduction system (DRS) on the Cessna 208B. The accident flight was part of the testing for Raisbeck to expand the applicability of that DRS to the Cessna 208B EX model modified with the Aircraft Payload Extender (APE III) STC, developed by AeroAcoustics Aircraft Systems Inc. QuickSilver Aero was contracted to provide instrumentation support for Raisbeck’s flight test program. At the time of the accident, the Raisbeck DRS STC was not installed. The airplane began flights to support the flight test three days before the accident. The three flights on the first day comprised a total of 1.1 hours and included a pilot familiarity flight and a ferry flight to have the airplane’s weight and balance measured. Two days before the accident, the flight test data collection flights began. Those included two flights, totaling 4.6 hours, to gather baseline data for both mid center-of-gravity (CG) cruise flight and forward CG stall speeds. The day before the accident, two test flights were performed with the accident test pilot and the accident aft-seated testing personnel. The purpose of the first flight, totaling 1.2 hours, was to test aft CG static sta

Probable cause

The pilot’s improper recovery following a departure from controlled flight after an intentional aerodynamic stall, which resulted in an exceedance of airspeed limitations, airframe overstress, and a subsequent inflight breakup.

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