Maximum external stress load (in pounds) with full fuel and pilot in calm air at standard atmospheric temperature.

A device that computes the probable rate of spread of a fire for different combinations of fuel moisture, wind speed, and other selected factors.

The act or system of discovering and locating fires.

The actual rate of decrease of temperature with elevation.

Individual lightning or railroad fires, especially when several are started within a short time.

Ratio of the amount of water to the amount of dry plant material in shrubs.

Piling slash resulting from logging or fuel management activities and subsequently burning the individual piles.

A circle, graduated in degrees, printed on some charts or marked on the ground at an airport or heliport. It is used as a reference to either true or magnetic direction.

Any accident where one or more fatalities occur and/or three or more personnel are inpatient hospitalized as a direct result, or in support of wildland fire suppression or prescribed fire operations. Accident may result in substantial property or equipment damage of $250,000 or more. 

Those agency costs that are billable and/or reimbursable as defined by the master or individual cost share agreement.