The guard has a mesh on it which when in icing conditions will ice up but the carby is still able to draw in air from the gap behind the mesh. Stops the intake itself being choked with ice. Lancaster has the exact same set up. Of course when iced up you lose ram effect. You see the same principle applied on the S-61 helo with the barrier in front of the intakes.
Last edited by Brian Abraham; 17th Nov 2006 at 23:30.