FAA Releases Airworthiness Concern Sheet Over Vibrations for Bell 206L Models
The FAA has released an Airworthiness Concern Sheet (ACS) for Bell Textron Canada Limited Models 206L, 206L-1, 206L-3, and 206L-4. The ACS is a result of reports received by the FAA of severe vertical vibrations on Bell 206L helicopters. The FAA is interested in receiving any information on occurrences of in-flight abnormal vertical vibrations and the conditions/configurations of the rotorcraft at the time of the event.

