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

INTERAGENCY SINGLE ENGINE AIR TANKER OPERATIONS GUIDE
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Tractor-plow: Any vehicle with a plow for exposing mineral soil, with
transportation and personnel for its operation; used mainly in southern U.S.
Traffic pattern: The path or route aircraft traffic takes when landing or taking
off or when performing tactical missions in the incident airspace or operations
area.
Trail: To drop doors in sequence, resulting in a long, unbroken retardant line.
Trench: A small ditch often constructed below a fire on sloping ground
(undercut or underslung line) to catch rolling material (see gutter trench).
Turbine: Jet-propelled, as opposed to reciprocating, engine.
Typical operating weight: Maximum loaded hopper and equipped weight
allowed under Civil Air Regulations (CAR) and Civil Aeronautics Manual
(CAM) Part 8 of the Federal Air Regulations (FAR) 21.25 airworthiness
certification for agricultural usage.
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UHF (ultra high frequency): Common to military aircraft; incompatible with
the VHF radio system. Operates in 300 to 3000 Mhz range.
Undercut line: Line constructed on a hillside when there is the possibility of
burning materials rolling down and crossing the fireline; incorporates a trench
into its construction. Can also be called trench line.
Unified command: A command structure which provides for all agencies or
individuals with jurisdictional responsibilities, geographical or functional, to
jointly manage an incident through a common set of objects.
Upwind (flight pattern): A flight path parallel to the direction of the final
before turning cross-wind.
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VHF (very high frequency): The standard aircraft radio that all civil and most
military aircraft use to communicate with Federal Aviation Administration
facilities and other aircraft.
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