I got a call from this number as well - showed up as ASVA. I didn't answer, and no message was left. Online, ASVA LLC shows to be a market research firm ( e.g., spammer). While it appears they may be more ethical than most, I don't waste my time helping such firms "market" more stuff to me, so in blocking them as well.
Received a call from this number last evening. The "kid" on the other line was unprofessional and a bit nervous. He did say the survey was on behalf of the FAA regarding flight service stations. Looking back at the rather odd conversation this call did not seem legit.
Caller said he was calling on behalf of the FAA and wanted to discuss Flight Service Stations. Caller sounded nervous and unfamiliar with the material. Did not give the survey. Next day received a solicitation in the mail to purchase Flying magazine. Hmmmmm.