Based on the fact that there was an auditorium added to our school only
two
years ago, and they used a stair char to change floor levels of about 6
feet, I would say yes.

stair chair or stair lift? By my definitions the lift is permanently
installed and the chair is more like the ones used to get folks in and out
of commercial planes where there is no jetway.

By your definition, a chair lift, but you might want to goggle for the exact
definition.

I looked at a commercial disability product site, and they were selling
attached tracks with a powered chair that went up and down, and they called
that a stair chair. They called a chair lift, more like an elevator
platform. I have no idea what you are talking about, which I take that you
mean a human powered hand truck type of device that has a seat on it.

So, I don't know who is right or wrong, but it matters not to me.

Ours is a permanently mounted track which a motorized chair folds out of, to
lift the seat up and down the stair.

I could still see a compact version of this type of device work for a large
aircraft like the HK-1.
--
Jim in NC