What was found
WHILE ON A FLIGHT THE LEFT BLEED AIR SYSTEM WENT INTO EMERGENCY. THE AIR IN EMERGENCY IS EXTREMELY HOT. WHILE IN EMERGENCY, THE AIRCRAFT FILLED WITH THICK SMOKE AND EMERGENCY DESCENT WAS PERFORMED. A LANDING WAS MADE WITHOUT INCIDENT. INVESTIGATION FOUND PROBLEM OF THE AIRCRAFT GOING INTO EMERGENCY WAS CAUSED BY WIRING GOING TO MOD VALVE RELAY BRACKET (LEFT) GOT AGAINST A LINE GOING TO WINDSHIELD HEAT SYSTEM. THE SMOKE WAS CAUSED BY AN IMPROPERLY INSTALLED CARPET FROM A RECENT INTERIOR JOB BLOCKING HEAT DUCTS.