4 fatal · CESSNA 421C · 2011-12-09 · Sioux Falls, SD, USA
Event
NTSB number
CEN12FA100
Event ID
20111209X74224
Type
Accident
Date
2011-12-09
Location
Sioux Falls, SD, USA
Coordinates
43.592224, -96.751945
Injuries
Highest injury
FATL
Fatal
4
Serious
0
Minor
0
Uninjured
0
Total aboard
4
Aircraft
Make
CESSNA
Model
421C
Registration
N421SY
FAR Part
135
Engines
2
Damage
SUBS
Conditions
Light
DAYL
Weather
VMC
Probable cause
The pilot’s failure to maintain adequate airspeed after shutting down one engine, which resulted in an inadvertent aerodynamic stall and impact with terrain. Contributing to the accident was the pilot’s failure to follow the guidance contained in the pilot’s operating handbook, which advised feathering the propeller of the secured engine and retracting the flaps and landing gear.