There is plenty of cooling air available in flight, but only one place it gets in - the scoop just above the RH inlet.
That feeds a heat exchanger that exhausts its warm air into the inlet duct (or the fan duct).
Result, I believe, is that this is more than a ground-running issue. More here:
AFRL?s Invent Program Tackles Aircraft System Efficiency | AWIN content from Aviation Week
And here:
https://www.ieeeusa.org/calendar/con...rview-Iden.pdf