Each year there are unfortunate accidents involving light aircraft as they fly through mountainous canyons. Many of these accidents need not happen and it should be expected by pilots that they can and will experience problems with up and down drafts in mountain ranges. That is not strange, that is typical of Bernoulli's principle and it can get dangerous in the mountains, unless you have unlimited power. Airflows speed up in canyons a more air is forced into a smaller space.

Some may think that rough air over mountains is just a