Gearbox Issue’s Root Cause Elusive As USAF Investigates V-22 Crashes

An Air Force CV-22

An Air Force CV-22 was forced to land in Norway, prompting a grounding of the service’s Ospreys to investigate ongoing transmission problems.

Credit: Tech. Sgt. Westin Warburton/U.S. Air Force
For most of the Bell-Boeing V-22 Osprey’s service life, operators have tried to work around a phenomenon inside the tiltrotor’s gearbox: The sprag clutch slips, causing a subsequent hard engagement that can damage the engine and affect flight safety. In mid-August, U.S. Air Force Special Operations...

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