Total amount of heat released per unit area as the flaming front of the fire passes, expressed as Btu/square foot; a measure of the total amount of heat released in flames.

An accessory used between the helicopter cargo hook and sling load to allow free turning of the load.

An unplanned event that results in damage which is less than serious aircraft incident criteria, or injuries not requiring medical attention.

An incident or malfunction that could adversely affect the safety of flight.

The individual responsible for on-scene incident activities, including developing incident objectives and ordering and releasing resources. The Incident Commander has overall authority and responsibility for conducting incident operations through a Delegation of Authority.

The amount of heat flowing through a given area in a given time, usually expressed as calories/square centimeter/second.

The physical location of a resource when not on assignment.

A term used to describe the consistency and viscosity of low expansion foam as the combination of drain time and expansion.

A factor usually on a scale of 1 to 100 which represents a relative rate of forward spread for a specific fuel condition and fixed weather conditions (or fuel model). Factors can be used as multipliers, arguments for entering tables, or provide a ratio of values between two fuels. 

Centrifugal pump with a single impeller.