Stanley wrote:
I am having some trouble finding the rules.
I have a friend that is ready for the DAR. When discussing the flight
test area, my friend was trying to include some local airports if
possible. The DAR responded that he would not be able to land there in
phase 1.
While I have seen that this type of restriction has been added to the
operating limitations on other aircraft in phase 1, I have not yet
found the rule that says that is necessary.

This appears to be the only relevant regulation:

"91.305 Flight test areas

No person may flight test an aircraft except over open water, or sparsely
populated areas, having light air traffic."

The most relevant AC, wherein airport selection is discussed, appears to be
this one:

http://www.faa.gov/library/manuals/a...a/ac90-89a.pdf