What’s the only possible cause of wing fire?
due to a short circuit in the wiring of the navigation lights or from the heated pitot tube;
What’s the first thing to do?
eliminate the source of the fire and then try to turn it off if the free-flowing air is not enough:
1
Navigation Lights: “OFF”.
2
Pitot Heat: “OFF”.
3
Strobe Lights: “OFF”.
4
Perform a sideslip, so that the flames trail behind the aircraft and away from the tanks, trying to get a high enough speed to extinguish the flames (never exceeding the red arc).