ZapBrannigan
If it ain’t a Boeing, I’m not going. No choice.
1) When anti-ice is on and an minimum compressor speed must be maintained.
Yes. Thats an outstanding point that I neglected to mention.
In the Lear 31, for example, you have to maintain at least 60% N1 to keep the nacelles hot. Well, there's no way to have more than a 300-400 fpm rate of descent at 60% power down low, so no choice. If you're in icing, spoilers out, keep the power up, and descend.
Ya' gotta do, what ya' gotta do.