The FAA has advised helicopter operators and repair facilities of the potential failure of engine-mount assemblies on Bell helicopter models 206L1 and 206L3 from corrosion.
In an Information for Operators notice, the FAA recommended that operators and repair facilities “be aware of and reduce the risk of possible accidents caused by corrosion,” and “pay close attention to the engine mount areas and associated components during inspections for signs of corrosion.” There are 201 BHT-206L1 and 203 BHT-206L3 aircraft registered in the United States.
In response to the report, Bell Helicopter issued an Operational Safety Notice on Jan. 21, 2015. The manufacturer has replaced the steel used for the affected parts with corrosion-resistant steel, the FAA said.
The agency reviewed the Service Difficulty Report database for the affected parts and identified “11 reports specifically related to engine-mount leg-assembly failure due to corrosion,” the FAA said.