Where a halon extinguisher is lawfully installed and approved for the relevant fire classes, which listed fire types fall within its general extinguishing capability when used according to approved procedures? 1 - Ordinary combustible solids (fabric, plastics, etc.). 2 - Flammable liquids (alcohol, gasoline, etc.). 3 - Flammable gases. 4 - Combustible metals (magnesium, etc.). - ATPL Question Bank In English