A fire caused by the transfer of burning material through the air into flammable material beyond the perimeter of the main fire.

ANCHOR POIN T

The part of the fire perimeter opposite the head.

Means “turn” left or right. Applies to aircraft in flight, usually on the drop run and when given as a command to the pilot. Implies a prompt compliance.

The uppermost spreading, branchy layer of vegetation.

The four chief points of the compass: North, South, East, West.

A means of establishing a target or point by reference to clock directions where the nose of the aircraft is 12 o clock, moving clockwise to the tail at 6 o’clock. “The target is now at your 9 o’clock [..]

How a helicopter is equipped.

An inclusive term for all constructed or natural fire barriers and treated fire edge used to control a fire’s spread.

Density of retardant in drop. Normally ranges from 1 to 7 and represents the number of gallons in a 100 square foot area.