Narrative:

I was flying on a southbound VFR flight. Upon climb out there was a scattered to broken layer of clouds at 3800 ft AGL; so I elected to remain below the cloud layer and cruise at 3000 ft MSL. I was not receiving traffic advisories because I had not yet requested them. I looked out the left window and saw a white piper low wing at my altitude on a westerly heading; approximately 500 ft from my position and closing. I reacted with a shallow dive while the second aircraft passed aft of me. From my detection of the traffic to the aircraft passing aft; the incident took less than two seconds. I did not detect any contact between me and the other aircraft; but I elected to divert to a nearby airport for a precautionary landing. I believe the cause of the incident was the absence of radar traffic advisories in a congested training airspace. A contributing factor was the low cloud layer. In the future I believe the flight program should implement an improved plan for maintaining traffic separation among students and other aircraft in the training airspace.

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Original NASA ASRS Text

Title: A PA28 private pilot on a training flight had a close encounter with another Piper low wing aircraft.

Narrative: I was flying on a southbound VFR flight. Upon climb out there was a scattered to broken layer of clouds at 3800 FT AGL; so I elected to remain below the cloud layer and cruise at 3000 FT MSL. I was not receiving traffic advisories because I had not yet requested them. I looked out the left window and saw a white Piper low wing at my altitude on a westerly heading; approximately 500 FT from my position and closing. I reacted with a shallow dive while the second aircraft passed aft of me. From my detection of the traffic to the aircraft passing aft; the incident took less than two seconds. I did not detect any contact between me and the other aircraft; but I elected to divert to a nearby airport for a precautionary landing. I believe the cause of the incident was the absence of radar traffic advisories in a congested training airspace. A contributing factor was the low cloud layer. In the future I believe the flight program should implement an improved plan for maintaining traffic separation among students and other aircraft in the training airspace.

Data retrieved from NASA's ASRS site as of April 2012 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.