What is the procedure for handling a wing fire?

The appropriate procedure for handling a wing fire involves turning off navigation and strobe lights. This action serves multiple purposes; first, it reduces the overall electrical load on the aircraft, which is crucial when dealing with a fire threat. Second, it minimizes the chance of igniting any nearby flammable materials. By turning off these lights, the pilot can focus on managing the fire and ensuring the immediate safety of the flight without unnecessary distractions.

The other options present scenarios that are not advisable when facing a wing fire. Landing immediately without assessing the situation can be dangerous, as it may not provide adequate time to control the fire or prepare for an emergency landing. Opening all windows is typically not a standard fire response and could potentially worsen the situation by allowing more oxygen into the area of the fire, making it more difficult to control. Increasing altitude might also not be a safe option, as this could further complicate the situation without directly addressing the fire itself.