Final
None
Jul 6, 2017
N153B accident at Big Lake, MN
Bell 47D1 — Part(s) separation from AC at Big Lake, MN
DateJul 6, 2017
Tail numberN153B
AircraftBell 47D1 · Bell 47 · B47G
LocationBig Lake, MN
Phase of flightStanding
OperationPart 137 Aerial application
InjuriesNone
NTSB caseCEN17LA264
Probable cause
The failure of the metal core assembly within a wooden main rotor blade due to undetected corrosion and fatigue, which caused the wooden blade to separate from the rotor mast.
View the full NTSB report (PDF) →
Get email alerts
Follow any of these and NTSB Alerts emails you when a matching report publishes — including when this case is updated.