A line of water, or water and chemical retardant, sprayed along the ground, and which serves as a temporary control line from which to ignite or stop a low-intensity fire.

The address where the unit must be physically located, and dispatched from, during the mandatory availability period.

Disposing of cargo, fuel, water or retardant overboard to lighten an aircraft or to improve its stability.

Fire originating in or on a vehicle or mobile equipment.

The probable moisture content of fast-drying fuels which have a timelag constant of 1 hour or less; such as, grass, leaves, ferns, tree moss, pine needles, and small twigs (0-1/4").

The relative difficulty of constructing control line as determined by the fuel, topography, and soil.

A low expansion foam type with some bubble structure and moderate drain time, exhibiting properties of both wet and dry foam types, which is used for extinguishment, protection, and mopup.

Angle between the flame at the leading edge of the fire front and the ground surface, expressed in degrees.

Fire spreading, or ignited to spread, into (against) the wind or downslope. A fire spreading on level ground in the absence of wind is a backing fire.

The act of setting fire to unburned fuels located between the control line and main fire in burning out operations.