Narrative:

Aircraft #1 was an small aircraft X on a pleasure flight with pilot and one front seat passenger. The aircraft was in level flight on a heading of 080 degrees at 2800' MSL. Although the muscle shoals FSS (123.6) had been monitored earlier in the flight, the pilot was currently monitoring hsv approach (118.05) in anticipation of joining the arsa when within 30 NM of hsv. Aircraft #2 was an small aircraft Y. The aircraft appeared in the upper left windshield of small aircraft X on an estimated heading of 190-200 degrees. The aircraft passed over and ahead of small aircraft X with estimated sep of 200' vertically and 50' horizontally. It is believed that the left door post or, less likely, the leading edge of the left wing prevented the pilot from seeing small aircraft Y any sooner. Small aircraft Y took no evasive action, and it is believed that he also failed to notice to conflicting traffic, due to its relative position to the lower right of small aircraft Y's nose. Small aircraft Y was seen to continue on to the south at 4 O'clock position relative to small aircraft X, and with no apparent altitude change. The small aircraft X pilot returned to the FSS frequency with the intention of asking small aircraft Y if he had been aware of the near miss. However, small aircraft Y did not call the FSS, and it is now assumed that small aircraft Y continued on to a more distant destination. The incident occurred outside of hsv radar advisory coverage. Reported hsv visibility was 15 mi, but in flight visibility, with a descending sun, was closer to 7-8 mi (to the muscle shoals runway from 3000' MSL), except down-sun where 10-12 mi visibility was available.

Related reports:

Google
 

Original NASA ASRS Text

Title: NMAC BETWEEN TWO SMA'S NEAR HSV.

Narrative: ACFT #1 WAS AN SMA X ON A PLEASURE FLT WITH PLT AND ONE FRONT SEAT PAX. THE ACFT WAS IN LEVEL FLT ON A HDG OF 080 DEGS AT 2800' MSL. ALTHOUGH THE MUSCLE SHOALS FSS (123.6) HAD BEEN MONITORED EARLIER IN THE FLT, THE PLT WAS CURRENTLY MONITORING HSV APCH (118.05) IN ANTICIPATION OF JOINING THE ARSA WHEN WITHIN 30 NM OF HSV. ACFT #2 WAS AN SMA Y. THE ACFT APPEARED IN THE UPPER L WINDSHIELD OF SMA X ON AN ESTIMATED HDG OF 190-200 DEGS. THE ACFT PASSED OVER AND AHEAD OF SMA X WITH ESTIMATED SEP OF 200' VERTICALLY AND 50' HORIZLY. IT IS BELIEVED THAT THE L DOOR POST OR, LESS LIKELY, THE LEADING EDGE OF THE L WING PREVENTED THE PLT FROM SEEING SMA Y ANY SOONER. SMA Y TOOK NO EVASIVE ACTION, AND IT IS BELIEVED THAT HE ALSO FAILED TO NOTICE TO CONFLICTING TFC, DUE TO ITS RELATIVE POS TO THE LOWER R OF SMA Y'S NOSE. SMA Y WAS SEEN TO CONTINUE ON TO THE S AT 4 O'CLOCK POS RELATIVE TO SMA X, AND WITH NO APPARENT ALT CHANGE. THE SMA X PLT RETURNED TO THE FSS FREQ WITH THE INTENTION OF ASKING SMA Y IF HE HAD BEEN AWARE OF THE NEAR MISS. HOWEVER, SMA Y DID NOT CALL THE FSS, AND IT IS NOW ASSUMED THAT SMA Y CONTINUED ON TO A MORE DISTANT DEST. THE INCIDENT OCCURRED OUTSIDE OF HSV RADAR ADVISORY COVERAGE. RPTED HSV VISIBILITY WAS 15 MI, BUT IN FLT VISIBILITY, WITH A DSNDING SUN, WAS CLOSER TO 7-8 MI (TO THE MUSCLE SHOALS RWY FROM 3000' MSL), EXCEPT DOWN-SUN WHERE 10-12 MI VISIBILITY WAS AVAILABLE.

Data retrieved from NASA's ASRS site as of July 2007 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.