CERTIFIED LTR REQUESTING NHTSA INITIATE A DEFECT INVESTIGATION RE SELECTED FORD MOTOR COMPANY VEHICLES LEFT FRONT INNER BEARINGS FOR ADVANCED FATIGUE CRACKS. *TS COMPLAINANT WAS RECENTLY ASKED TO CONSULT IN THE MATTER OF A FATAL HIGH SPEED HEAD ON TWO-VEHICLE COLLISION. WHILE DRIVING WESTBOUND 2001 FORD EXPEDITION VEERED INTO THE ONCOMING LANE AND STRUCK AN EASTBOUND 2000 FORD F250 LONG BED TRUCK TOWING A 5TH WHEEL TRAVEL TRAILER. THE RESULTING COLLISION KILLED THE THREE OCCUPANTS IN THE 2001 EXPEDITION AND THE TWO OCCUPANTS IN THE 2000 FORD F250 PICKUP TRUCK. THE PICK UP TRUCK AND TRAILER WERE COMPLETELY ENGULFED IN FLAMES UPON OFFICER'S ARRIVAL. METALLURGICAL ANALYSIS SHOWED THAT THE LEFT FRONT INNER BEARING FAILED ON THE EXPLORER AS A RESULT OF PROGRESSIVE FATIGUE. THE BEARING FAILURE OCCURRED AT APPROXIMATELY 30,000 MILES. PLEASE REFERENCE ODI# 10139931 TO OBTAIN INFORMATION ON THE 2001 FORD EXPEDITION. *NM