Helicopters in Turbulence: Part 2

Forensic engineers examined the main rotor driveshaft that had sheared just below the teeter stops. Teeter stops are fitted to the main rotor driveshaft to prevent the main rotor spindles from contacting the driveshaft in normal operation. The accident report noted that New Zealand’s topography and prevailing wind conditions mean that for much of the country, and particularly the South Island, turbulent conditions can be encountered most of the time. Credit: New Zealand Transport Accident Investigation Commission
The first part of this article series covered how trubulence can cause catastrophic mast bumping, main-rotor stall and loss of control. Prior to a flight in mountainous terrain on June 8, 2002, the pilot of a Bell 47G3-B-1 obtained a weather forecast that called for winds from the southwest at 30...

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