The initial encounter for that one is also pretty unlikely unless these codes are used by coroners.
But people have been partly inhaled and survived. The trick is doing it on older engines with a non-moving set of blades on the engine face and on aircraft with long intake tracts. In those circumstances there’s an opportunity for something like earmuffs or safety vest to get sucked in first, followed by the person a moment or two later.
The equipment gets into the engine & wrecks it, prompting a lot of noise & vibration so the pilot quickly shuts down. Meanwhile the person either gets hung up partway down the intake or up against the non-moving front blades. And hangs there for the few seconds it takes for the engine RPM to decay to not producing much suction. Not that it wouldn’t feel like an eternity for the victim.
Conversely, nobody is going to survive going into a modern airliner fan. The front set of blades is moving and the intake is a smooth short tunnel bigger than most folks arm/leg span. The engine will burp and the person will be burger. Their next “encounter” with the medical industry will be a mop & bucket crew followed by a post-mortem tox test on a tissue sample AKA chunk-o-meat.
I think I’d have to code all of those under R46.1, Bizarre personal appearance. Dammit. How are we going to separate the mouse sized people from the snake shapeshifters now?! We need more codes.
If such a metal screen were feasible (see the subjunctive there? :D) then one would expect planes to have them.
This were discussed (now if I only were sure this is grammatically correct) back when Captain Sully ditched that plane into the Hudson after initial encounter with goose. Turns out, it’s not feasible. See this post by aerodave for detailed discussion, the introductory part of which I quote here: