Genghis,
I too got that email and looked into it a bit more. Sadly they are not interested in any non-US candidates "at the moment" but the good news is the pay is better than quoted.
For anyone interested two links to the details:
FAA-AIR-99-FTP-25910. the opm site is
http://jobsearch.usajobs.opm.gov/ and the FAA site is
http://jobs.faa.gov/. you can search on the announcement number, the words test pilot, or the job series, which is 2181
If you get in, keep a space for me please!
Tarnished