Scan Polishing

摘要

I read your article, "Polishing Your Scan: Our Top Five Tips" (December 2021), twice. As always, it was well-written and thoughtful. I have to say my experience with view-limiting devices seems to be the opposite of that suggested in the article. Compared to flying with a view-limiting device, I find it easier to maintain precise parameters when I'm actually in solid IFR or in a simulator/ AATD with zero outside visibility. In solid weather, all of a pilot's attention is on the instruments. I'm a CFI-I and I've noticed that my instrument students also maintain better parameters in the zero-zero world of the AATD compared to flight with a view limiting device. Secondly, I find that the outside peripheral vision available with a view-limiting device is often a negative. It can be a distraction that degrades the instrument crosscheck somewhat similar to flying under a cloud deck with ragged bottoms.