What was found
MAY 8TH, 2020 FLIGHT FROM (APF) TO (FAR), DURING CRUSE AT FLIGHT FL400 CREW HAD A SMOKE ODOR IN THE COCKPIT. SMOKE WAS NOT ROARING BUT A LIGHT HAZE AND IRRITATING TO THE EYES. CAPTAIN DECLARED AN INFLIGHT EMERGENCY AND DIVERTED TO (STL). AFTER INSPECTING AIRCRAFT, THE YAW DAMP MODULE ASSY, PART NUMBER 9519007-2 WAS FOUND DEFECTIVE. AS OF THIS WRITING NO TEAR DOWN REPORT OF MODULE UNIT IS AVAILABLE AS TO NATURE OF WHAT PART OF MODULE FAILED. THERE WAS NO LOSS OR OTHER DAMAGE TO THE AIRCRAFT.