What was found
UPON RECEIVING INSP OF NEW MFG AIR FILTERS PN P107336 IT WAS FOUND THAT 3 OUT OF 4 NEW FILTERS HAD A DEFECTIVE SEALING SURFACE CAUSING THE SEALING/MATING SURFACE TO CRACK AND CRUMBLE. THIS DEFECTIVE SEALING SURFACE COULD POTENTIALY ENTER THE ENGINE INLET. THE DEFECTIVE FILTERS HAVE A LIGHT GREY COLOR TO THE SEALING SURFACE. THE REPLACEMENT FILTERS THAT WERE LATER RECEIVED, INSPECTED, AND FOUND TO BE IN SERVICEABLE CONDITION HAD A DARK GREY ALMOST BLACK SEALING SURFACE. SUSPECT THAT THE DEFECTIVE FILTERS HAD IMPROPER MATERIAL ON THE SEALING SURFACE OR WAS IMPROPERLY CURED.