The FAA has asked SAE to work through two of the more difficult issues as it attempts to complete a policy statement on IBF installation.
The has tasked SAE with developing a recommended practice standard on an alternative means to substantiate that an inlet barrier filter modification on a helicopter does not exceed engine inlet distortion limits. Even though it has been trying to draft a policy statement on IBFs for some time, Donaldson Aerospace & Defense still received U.S. approval for its dry media IBF for the Bell 407 in July. (Photo: Donaldson Aerospace & Defense)
