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If you turn them on when it's not raining, it explodes.

If you forgot to turn them off when it stops raining is more apt comparison except it's easier to detect no rain than no frosting conditions.

it seems easy to detect overheating, frost or no frost, no?

I think the main issue is that every other plane does in fact detect and handle overheating automatically.

When you’re 6 inches from a continual fireball?