A separate radio frequency most commonly used in air traffic control which reduces frequency congestion by controlling the number of aircraft or other resources operating on a particular frequency.

Any written agreement giving one party a right, a service, or a commodity in exchange for a right, a service, or a commodity. Contracts include land use permits, purchase orders, equipment rental agreements, leases, etc.

An organization needed to support an incident which expands along with the Incident Command System.

A map maintained on a large fire to show at given times the location of the fire, deployment of suppression forces, and progress of suppression.

Portion of human-caused fires that have occurred on a protection unit chargeable to a specific risk source; calculated for each day of the week for each risk source.

The chance of fire starting as determined by the presence and activity of causative agents.

Any cargo carried beneath a helicopter and attached by a lead line and swivel.

Any fire crew composed of prison inmates or wards.

Specially developed coils containing explosive powder that are detonated to create a fireline through ground fuels.

The ratio of the original volume of the nonaerated foam solution to the resultant volume of foam. The inverse of expansion.