Bell 206L-4 Longranger IV, G-PTOO, 3 March 2011

Bell 206L-4 Longranger IV, G-PTOO


The pilot carried out a precautionary landing at London City Airport, after the onset of vibration during the cruise. Examination revealed that a bolt, securing balance weight assemblies to a tail rotor blade, had failed due to the formation of a crack in the bolt shank which propagated in fatigue. The helicopter manufacturer confirmed that this was the first reported occurrence of this nature relating to this design of tail rotor system.

Download report:

Bell 206L-4 Longranger IV, G-PTOO 07-11.pdf (323.50 kb)

Published 10 December 2014