Cargo Heat Control Panel
Hot Air Switch
AUTO - Auto is the normal switch position and is indicated when all lights are extinguished on the Hot Air Switch. The AUTO position enables the cargo heat temperature selector to control the aft cargo temperature.
FAULT - The fault light on the cargo heat hot air switch illuminates amber when a duct overheat is detected.
AFT CARGO HEAT - Aft cargo heat is only available on A-320 aircraft. A cargo heat controller provides for operation of the cargo heat inlet and outlet isolation valves, and a cargo heat extraction fan. Hot trim air from the packs is provided to control the aft cargo compartment temperature, via the hot air pressure regulating valve. The temperature is controlled by the cargo heat temperature selector.