Plain English Meaning
A landing spot that is boxed in by obstacles on one or more sides, leaving the pilot only limited directions in which to come in or take off.
Full Definition
In helicopter operations, a landing or takeoff site whose usable area is restricted on one or more sides by obstacles such as trees, buildings, terrain, wires, or other barriers that limit the approach, departure, and maneuvering paths available to the aircraft.
Context Anchor
Commonly encountered in helicopter training, off-airport landings, emergency landing planning, and discussions of into small surrounded by trees, buildings, wires, or uneven terrain.