Challenger Aviation Products premium high flow air filters are FAA/PMA certified for Robinson Raven 44 II helicopter.

Their aircraft air filters are designed using proprietary K&N Engineering high performance filter media to increase clean air flow which means more horsepower. Challenger has over 15,000 cleanable reusable air filters for most general aviation aircraft and helicopters. Pilots have reported up to one inch in manifold pressure, more speed and including fuel savings from one half to one gallon of gas