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Having just been to a bunch of air museums, I've seen quite a few of these:

enter image description here

img credit http://www.thewire.com/global/2013/02/iran-new-stealth-fighter-jet-fake/61781/

Those red pads they put in the jet engines that say "remove before flight" - what happens if I try to start the engine with that pad in there? Would the exhaust just blow it out?

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    If anyone can find a better, clearer picture of these pads I'd much appreciate it. Part of it is likely that I don't know what their real name is. –  Sep 01 '14 at 13:53
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    Is that a real aircraft? – flyingfisch Sep 01 '14 at 13:53
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    I don't believe it is, given http://www.thewire.com/global/2013/02/iran-new-stealth-fighter-jet-fake/61781/. But it does show the thing I want to show. Again, if you can find a better image, please do! –  Sep 01 '14 at 13:55
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    Ah ok, I thought it looked a little fake ;-) – flyingfisch Sep 01 '14 at 13:56
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    in that case it's a cover over the jet exhaust, either it will stop the engine from spooling up enough to ignite or blow off during spin-up. – ratchet freak Sep 01 '14 at 13:57
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    @flyingfisch it's just a model (sorry for the Monty Python reference) :) – jwenting Sep 01 '14 at 14:31
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    There are more areas where "remove before flight" tags are used. This include control column locks, pitot tube covers, etc. For jet engines, the cover prevents rain water, dust and (occasionally) small rocks from getting inside the engine. – kevin Sep 02 '14 at 08:17
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    Well the Firefox was able to start with the covers in place; it blew them right off. – tar Sep 03 '14 at 08:18

1 Answers1

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As Ratchet Freak says, it's going to blow away or cause the engine to fail. Latter might happen if it sits tight enough that it doesn't get blown away before overpressure develops in the engine.
Not a good thing, damage may happen.

My guess most likely outcome is that it will be blown back, possibly colliding with parts of the aircraft (and thus causing damage) or hitting the hangar wall or whatever else is behind the aircraft with some speed (unless there's a lot of clear area, in which case it'd flutter to the ground), if it's not overfastened.


And to be complete, it's a cover to prevent things from getting into the engine while the aircraft is parked. Dust, animals, anything.
There will be others on the air intakes as well.

jwenting
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