User blog comment:SlyCooperFan1/Ace Combat 7 - Kono's E3 Interviews/@comment-25045164-20170621055035/@comment-1824272-20170621141729

If you're slowing down hard enough to induce a stall, then yeah, that warning will show up if your aircraft hasn't completely iced yet.

That being said, your aircraft icing up will slow down your aircraft and cause it to stall if you lose too much speed.