What was found
INDICATOR BUTTON FAILURE OCCURRED (DETAIL PART BROKE IN HALF) 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 W/MICROSCOPE EXAMIN AT 7-30 POWER). 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 (BUTTON MATERIAL). PRODUCT DELIVERED T HS 813.