The chart excerpts depict a possible flight-planned route for the highlighted B36TC Bonanza overlaid on both a low-altitude en route chart and the local sectional. Note the extensive dark brown coloration shown on the sectional excerpt, denoting relatively high terrain, which is responsible for the route's minimum en route IFR altitude of either 11,000 or 12,000 feet mil. According to active Airmets, the flight's entire cruise portion was above the freezing level and in IMC.
Environmental risks, one of the four broad hazard categories the FAA identifies in its PAVE acronym (see the sidebar at the bottom of the opposite page), typically involve weather and terrain, but also can include traffic, navaids, obstacles and even wake turbulence. When several such hazards are present at the same time, they can easily […]
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