Narrative:

Flying to san juan; I was in cruise flight at 2;000 feet 10 nm from plaza carolina. Mid-morning local time ATC advised me of traffic at 12:00; 1/4 mile; 2;100 feet. Since I did not see the traffic I immediately started a precautionary descent. I again received the same advisory for traffic at 12:00; 1/4 mile and 2;100 feet. At this point I had descended about 50-100 feet when an aero commander passed about 100 feet directly above my aircraft in the opposite direction.

Related reports:

Google
 

Original NASA ASRS Text

Title: A light twin commercial carrier pilot approaching SJU reported a near miss at about 2;000 feet after descending in response to an ATC alert about approaching an approaching aircraft.

Narrative: Flying to San Juan; I was in cruise flight at 2;000 feet 10 nm from Plaza Carolina. Mid-morning local time ATC advised me of traffic at 12:00; 1/4 mile; 2;100 feet. Since I did not see the traffic I immediately started a precautionary descent. I again received the same advisory for traffic at 12:00; 1/4 mile and 2;100 feet. At this point I had descended about 50-100 feet when an Aero Commander passed about 100 feet directly above my aircraft in the opposite direction.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.