Originally Posted by
BEagle
"If this isn't valid", he said holding up a UK PPL, "Then neither is this", he continued holding up a 61.75.
Absolutely correct. The only question then is what does 'valid' mean? Many seem to interpret that as "If you can't
use this then you can't use this" which is incorrect according to FAA logic. If you let your UK SEP rating expire, you cannot fly - but your licence does not disappear in a puff if smoke and cease to exist. It is still valid according to the FAA if it hasn't been suspended or revoked. Therefore you can fly on your associated 61.75 as long as you have a valid flight review.
By regulation a 61.75 is not a standalone licence. It needs to be issued 'on the basis of' something. The underlying licence merely needs to exist, it does not need to be current. That's what the flight review is for.