AN INSUFFICIENT CURE CONDITION IN THE BEAD WIRE RUBBER INSULATION WAS CAUSED BY A SMALL AMOUNT OF CONTAMINATED RUBBER.
TIRES MAY NOT PASS STRENGTH TEST REQUIRED BY FMVSS 109.
TIRES FAIL TO MEET REQUIREMENTS OF ENDURANCE TEST FMVSS # 109. FAILURE WAS DUE TO HIGHER THAN SPECIFIED SECOND PLY ANGLE. CONSEQUENCE OF DEFECT: THE INCORRECT SECOND PLY ANGLE CAUSED CHAFING OF PLIES IN THE BEAD BASE AREA. A CHAFED PLY CAN RESULT IN SUDDEN AIR LOSS AND VEHICLE CRASH MAY OCCUR WITHOUT PRIOR WARNING.
THE INVOLVED TIRES MAY CONTAIN LESS RUBBER INSULATION BETWEEN THE INNER EXTREMITY OF THE BEAD BUNDLE AND WIRE PLY STOCK THAN NEEDED. THE WIRE PLY STOCK COULD SHEAR WHEN CONTACT IS MADE WITH THE BEAD BUNDLE.
THE INVOLVED TIRES MAY CONTAIN LESS RUBBER INSULATION BETWEEN THE INNER EXTREMITY OF THE BEAD BUNDLE AND WIRE PLY STOCK THAN NEEDED. THE WIRE PLY STOCK COULD SHEAR WHEN CONTACT IS MADE WITH THE BEAD BUNDLE.
THE INVOLVED TIRES MAY CONTAIN LESS RUBBER INSULATION BETWEEN THE INNER EXTREMITY OF THE BEAD BUNDLE AND WIRE PLY STOCK THAN NEEDED. THE WIRE PLY STOCK COULD SHEAR WHEN CONTACT IS MADE WITH THE BEAD BUNDLE.
THE DEFECT INVOLVED RESULTED FROM A BROKEN DRILL BIT PROTRUDING 0.15 INCH IN THE MOLD WHICH PENETRATED THE CURED TIRES TO THE PLY CORD IN THE SIDEWALL AREA. TIRES WILL NOT LEAK AIR BUT MOISTURE AND DIRT MAY ENTER THE HOLE AND CAUSE FAILURE.
THE INVOLVED TIRES CONTAIN VOIDS BETWEEN THE TOP PLY AND THE TREAD IN THE SHOULDER AREA. THIS CAN LEAD TO TREAD SEPARATION WHILE IN OPERATION.