What is the recommended source to control fire in aircraft hangars?

Aqueous Film Forming Foam (AFFF) is the recommended source for controlling fires in aircraft hangars due to its ability to effectively suppress flammable liquid fires, which are often present in such environments. AFFF creates a film on the surface of the fuel that prevents the release of flammable vapors, thereby smothering the fire and preventing re-ignition. This makes it particularly suitable for use around aviation fuels, which can ignite rapidly and burn very hot.

In addition to its effectiveness against flammable liquids, AFFF is designed to provide rapid fire knockdown and cooling capabilities, which are crucial in minimizing damage and protecting personnel in high-risk areas like hangars. Its application versatility and ability to cover large areas quickly also contribute to its suitability as a primary firefighting agent in these settings.