It depends on how the checklist was structured/phrased though doesn’t it?

“Check for rain cover” isn’t as clear as “Remove rain cover from engine and stow in compartment labeled ‘Rain Cover’.”

In all fairness, Lockheed Martin made the cover bright red.

"Remove before flight" items often also have a long red streamer attached.

One possible engineering solution would be to make the cover out of a material strong enough to keep out the weather, but flimsy enough that if the engine was running it would suck it in and harmlessly shred/burn it.

It is non-excusible.

It is bloody red cover, sorry for the British f word. Just look ! It is strange to have that red thing.

Head rolling needed. Life and death in fighting situation.

Having said all that may be we should have that to baby sit these pilot. And ground crew.

Well, the British f-word is just that.