"C-FJYW, an ATR 42-300 aircraft operated by Calm Air International LP, was conducting a flight
from Rankin Inlet (CYRT), NU to Repulse Bay (CYUT), NU with 3 crew members and 14
passengers on board. In the descent through 4000 feet, the flight crew selected level 2 ice
protection. At approximately 2500 feet, the flight crew smelled electrical smoke followed by a dark
grey smoke emitting from the first officer's side window. Once clear of icing conditions, the crew
reverted to level 1 ice protection, notified CYUT CARS of the cockpit smoke and declared an
emergency. On landing, the crew observed that the first officer side window and electrical
connection began to burn and melt. While the aircraft taxied off the runway small flames appeared.
The crew notified the flight attendant, shut down the aircraft, and discharged the hand held fire
extinguisher onto the burning portion of the window and associated electrical connection;
extinguishing the fire. RCMP and volunteer fire department were dispatched to the aircraft and
remained near the aircraft for 30 minutes post fire, to ensure no re-ignition of fire."
"Although turning off the windshield heat may be considered intuitive, explicit guidance on how to respond to windshield arcing, smoke, fire, or overheating would better prepare flight crews to act immediately in such an event. Therefore, the NTSB recommends that Bombardier add an emergency procedure checklist and revise training materials for all DHC-8 airplanes that specifically instruct flight crews, as a memory item, to immediately turn off windshield heat in the event of windshield arcing, smoke, fire, or overheating."
https://www.ntsb.gov/investigations/Acc ... -16-01.pdf