What was found
DURING TAXI, AFTER NR 1 ENGINE START, COCKPIT FILLED WITH SMOKE. AIR DUCT BETWEEN LEFT HAND ACM AND HEAT EXCHANGER CAME OFF. REINSTALLED DUCT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING TAXI, AFTER NR 1 ENGINE START, COCKPIT FILLED WITH SMOKE. AIR DUCT BETWEEN LEFT HAND ACM AND HEAT EXCHANGER CAME OFF. REINSTALLED DUCT.