What was found
WATER IS ENTERING THE INSTRUMENT AIR SYS AND CAUSING CORROSION OF THE SYS COMPONENTS. A HIGHER THAN ACCEPTABLE GYRO FAILURE HAS PROMPTED OUR MX STAFF TO PROBE INTO THE CAUSES OF THIS ISSUE. UPON OPENING THE INSTRUMENT AIR PRESSURE REGULATOR, AND MANIFOLD/CHECK VALVE ASSY FOR INSP, HEAVY CORROSION OF FERROUS COMPONENTS WAS NOTED. LARGE PARTICLES OF RUST ARE BREAKING LOOSE FROM THE FITTINGS AND OTHER STEAL PIECES IN THE SYS AND CONTAMINATING INSTRUMENTS. RECOMMEND THAT MFG DEVELOPE A SB OR KIT TO ALLOW FOR AN INLINE FILTER TO BE INSTALLED AFTER THE INSTRUMENT AIR REGULATOR BUT BEFORE THE AIR ENTERS INSTRUMENTS.