What it is
Primary sourceThe UK Civil Aviation Authority (CAA) recommends that Visual Flight Rules (VFR) flights maintain a terrain clearance of 2,000 ft over mountainous areas to account for descending air created by turbulence, downdrafts, and mountain waves.1 Mountain waves can cause turbulence far downstream.4 Utah backcountry flying includes landings, camping, assisting with cattle, and filming in canyons.2