Collins Proline 21; Terrain Display on the PFD

Terrain Display on the PFD

Here is a great example of the Terrain Display option on the

Collins Proline 21. In this picture, you can see the Terrain is displayed just as you see it out the windshield. The information is displayed very much like weather is displayed, with colors of Green, Yellow and Red. Red being the highest, relative to the airplane. You can tell the Steepness and Height of these mountains. Because there is no Green, a thin line of Yellow and right into Red, we call this a Steep Contour. The Height of the Terrain is displayed in the upper right corner of the lower PFD, hard to see in this picture. This is Ogden, Utah, the Terrain was about 5 to 6 miles from the end of the runway. Great tool for giving the "Big Picture". Imagine not having this and the mountains were obscured by clouds!