Interagency Single Engine Air Tanker Operations Guide - National ...

INTERAGENCY SINGLE ENGINE AIR TANKER OPERATIONS GUIDE
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Ground fire: Fire that consumes the organic material beneath the surface
ground litter, e.g., a peat fire.
Gutter trench: A ditch dug on a slope below a fire, designed to catch rolling
burning material.
- H -
Hand crew: Individuals organized, trained and supervised principally for
operational assignments on an incident.
Hand line: Line constructed using hand tools.
Hazard: A fuel complex defined by kind, arrangement, volume, condition and
location that forms a special threat of ignition or of suppression difficulty.
Hazard reduction: Any treatment of a hazard that reduces the threat of ignition
and spread of fire.
Head: Pressure due to elevation of water, it equals 0.433 pounds per square
inch (PSI) of elevation; also called back pressure.
Head fire: A fire spreading or set to spread with the wind.
Head of the fire: A “running edge” of the fire, usually spreading with the
greatest speed, driven by the wind or topography. It is not uncommon to have
two or more heads on a fire.
Heavy fuels: Fuels of large diameter, e.g., snags, logs and large limbs, which
ignite and are consumed more slowly than flash fuels; also called coarse fuels.
Heel (of a fire): The part of the fire perimeter opposite the head (see origin).
Also referred to as rear.
HEL CO (HLCO): Call sign identifier of the Helicopter Coordinator.
Held line: All worked control line that still contains the fire when mop-up is
completed; excludes lost line, natural barriers not backfired and unused
secondary lines.
Helibase: The main location within the general incident area for parking,
fueling, maintenance and loading of helicopters; usually at or near the incident
base.
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