Is it like a hatch that opens when the flares/chaffs needs to be deployed and then closes when its done?
@by78 @Deino is this a new variant of J20? I'm asking cause compare the photo below this plane had no CHAFF flaring between the tails and engine? maybe they change it?
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AFAIK they can be covered in a similar way, the EOTS done under the front can be covered too.
I think the cover will be blown off when deploying chaffs, then stay open. When one has to deploy chaff, it is too close, there is no point of stealth.