Cargo compartment (Class C) fire
It is my understanding that, on the Airbus & Boeing aircrafts, cargo holds below the main cabin floor deck are being pressurized with air coming from the main cabin. If this is the case, it is possible that a fire in these cargo compartments may travel into the main cabin through that air duct. Does any one know if, once the cargo fire detection system has been activated, that air duct closes automatically ? Thanks.