rframe
pǝʇɹǝʌuı
Uh, the "crew chief" is not an aircrew member (the BUFF does not have "flying crew chiefs" like some aircraft), and thus doesn't have a crew station with or without an ejection seat.
The B-52 crew is a Pilot, Copilot, and three Navs.
So not sure what your student is talking about, unless he went on an incentive ride and had to sit in a jumpseat. Maybe you can ask him some more details about how/why he has this B-52 flight time as someone in the maintenance team.
Maybe he was talking about maintenance rides or something, not sure. Just the way he described it to me.