Aerospace Filtration Systems anticipates FAA supplemental type certification (STC) for its AgustaWestland AW139 inlet barrier filter (IBF) system in the next few months. AgustaWestland and Aerospace Filtration engineers worked together to design the IBF system for the AW139. According to Aerospace Filtration, the AW139 IBF system features low-drag conformal fairings with dual filter assemblies mounted on the existing engine doors to create a sealed intake plenum. The system was designed using 3-D solid models of the current engine inlet doors provided by AgustaWestland. While Aerospace Filtration’s STC will make the IBF system available in the aftermarket, AgustaWestland is working on certifying the filter system so that it can be offered as an option on new AW139s. The AW139 system includes an alternate inlet air bypass system, which is activated by a cockpit switch. The IBF system also includes an integral filter maintenance aid so technicians can conduct pre- and post-flight on-condition inspections.