"John R Weiss" wrote:

:"Fred J. McCall" wrote...
:
: :In the US navy, the nuclear powered carriers only carry JP4 or JP8
:
: The US Navy uses neither of these fuels at sea, even to fill aircraft,
: much less to fill large ship's tanks. The Navy switched from JP4
: (which is a hideously dangerous fuel) to JP5 about half a century ago.
: The Air Force later switched from JP4 to JP8 (essentially Jet-A).
:
:Yep! That was a typo -- I meant JP5 or JP8. Thanks for the catch.
:
: The Navy currently uses JP8 ashore (because it's cheaper and easier to
: get) and JP5 at sea (because it's safer).
:
:OK. It appears sanity won over economics. There was talk in the late 80s/early
:90s to transition from JP5 to JP8 at sea as well as the JP4 - JP8 transition
:ashore.

I'm not positive, but I think the regs say something to the effect
that if you land with ANY JP4 on board, you have to be fully defueled.
If you have JP8, I think they'll allow a 50/50 mix with JP5 on a
refuel.

The latter presumably makes it more convenient for folks coming out
from shore bases just to do carrier quals.

--
"Millions for defense, but not one cent for tribute."
-- Charles Pinckney