In case of a cabin fire, what must be done with the vents and cabin heat?

In the event of a cabin fire, turning off the cabin heat is a crucial step to prevent further fueling of the fire and to reduce the spread of smoke within the cabin. The cabin heat system often utilizes hot air from the engine, which could exacerbate the fire if not appropriately managed. By shutting off the cabin heat, you are effectively isolating the heat source and minimizing the chance of the fire spreading due to the heated air circulating within the cabin.

Additionally, opening the vents or activating cabin air may introduce more oxygen, which could intensify the fire rather than extinguishing it. Keeping them as is could also allow any toxic smoke to remain in the cabin, compromising passenger safety. Therefore, turning off the cabin heat is the best action to take in this emergency scenario to protect the occupants and enhance the chances of successfully managing the fire.