on board aircraft electrical generator conduit structure collects intaken air during aircraft engine operation filters this air to capture and prevent the passage of particles and directs filtered airflow to that brush region through a close coupled fluid flow connection which closes upon and substantially isolates that region water drainage is provided for in a region near where filtering takes place the filtered airflow is substantially the only airflow admitted to this protected region application_number US 40958006 A description turning now to the drawings both figures indicated generally at 10 in fig1 is the nose engine compartment of an aircraft 12 in which a preferred and best mode embodiment of the invention has been installed the engine is not illustrated this embodiment implements the methodology of the invention as was mentioned earlier while the present invention may well have utility in various different kinds of vehicles it has been found to furnish significant utility in a particular aircraft model and thus is principally illustrated and described herein in such an aircraft this aircraft is a pilatus model pc 12 aircraft and accordingly that specific model of aircraft is referred to herein for the purpose of disclosure and illustration of the invention exposed on the outside of the engine housing provided for nose compartment 10 in fig1 are an engine exhaust outlet 14 disposed rearwardly thereof to the right in fig1 there is also provided an air flow inlet or intake 16 flight direction for aircraft 12 is indicated by an arrow 13 exhaust direction by an arrow 15 and airflow intake direction.