On Jan 12, 1:40*am, Thomas Borchert
wrote:
As always when flying there, watch the density altitude.

Another thing to watch for is turbulence that makes it very difficult
(maybe impossible) to keep the assigned altitude! Has anyone else
encountered this? Fortunately, when I did, there was almost no traffic
(February) so it wasn't an issue. It almost surely came from the wind
interacting with the walls of the canyon, creating a wave action (and
rotor). The second time I was there was in the summer and there was
strong thermal activity as well. That time I stayed above 15k so I
didn't have to keep an altitude. I know the ceiling of the airspace is
14,500, but with the turbulence you want a buffer.

Another thing: Be sure to get the special Grand Canyon chart well
before your trip. Most of the FBO's nearby did not have it on my last
trip! Sporty's or similar seems like the only sure way to get one.

Martin N56WT