THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION WAS PETITIONED TO COMMENCE A DEFECT INVESTIGATION OF THE SUBJECT VEHICLES BY A LETTER SIGNED BY WILLIAM F. ALLARD AND DATED 15-FEB-98.THE PETITION ALLEGES THAT THE SPARE TIRE MOUNTING PLACES THE TIRE SIDEWALL DIRECTLY IN CONTACT WITH THE METAL UNDERCARRIAGE CAUSING WEAR AND DAMAGE OF THE SIDEWALL.THE PETITION FURTHER ALLEGES THAT WHEN THE DAMAGED TIRE IS USED, BLOWOUT COULD RESULT ON AN INTERSTATE PLACING VEHICLE OCCUPANTS AND OTHERS AT RISK.