What was found
INDICATOR BUTTON FAILURE OCCURED ON THREE UNITS AND CRACKS CLEARLY EVIDENT ON TWO OTHERS IN SAME AREA OF BREAKAGE. ONCE BROKEN, A SECTION OF THE BUTTON CAN TRAVEL BEYOND THE SEALED AREA OF THE HOUSING AND HAS THE CAPABILITY OF ALLOWING A FUEL LEAK OF UP TO 1.5 GALLONS PER MINUTE. ENGINEERING ANALYSIS INDICATES A LOW CYCLE FATIGUE SITUATION (FATIGUE CRACKS VISIBLE WITH A MICROSCOPE EXAM AT 7-30X). CEP PERFORMED A FEA SIMULATING THE BUTTON RESTRAINED IN THE CAP HOUSING WHICH SHOWS THE FAILURE TO BE IN THE LOW CYCLE FATIGUE REGION FOR 7075-T6 ALUMINUM. FUEL FILTER MODULE, PN 60500 & PN 4951960 / SN`S: C0072, C0213, C0383, C0390, C0528