Donaldson’s Aerospace Filtration Systems (AFS) unit has received supplemental type certificate approval from the FAA for an inlet barrier filter (IBF) system for the AgustaWestland AW139. The new AW139 IBF system features low-profile conformal fore and aft fairings with dual filter assemblies mounted on the existing engine doors, creating a sealed intake plenum and an alternate inlet air bypass system activated by a cockpit switch.