Why do some airports with an instrument approach (e.g. HIE) lack a surface
Class E to protect the approach? HIE LOC 10 has Class G below 700' AGL, but
the MDA is well below that height. A plane can legally fly VFR just below a
700' ceiling along the final approach course, with no way for it to see and
avoid an approaching IFR plane, or vice versa.

--Gary