Small aircraft X had near midair collision with unknown aircraft.

Attributes
ACN	285233
Time
Date	199410
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	general aviation : personal
Make Model Name	Cessna 180 Skywagon
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller military : 3 controller radar : 6
ASRS Report	285233
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 400 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Small aircraft X, a C-180/right, called VFR requesting his IFR to int. I idented the aircraft 3 mi from my airspace boundary with ZTL and issued a short range clearance to contain him in my airspace. After coordinating with the center sector I went back to the cessna to issue his full clearance. The aircraft was now in the vicinity of the guinnett NDB at 3000 ft MSL. Small aircraft X advised he had just had a near miss. Due to poor radar coverage in this area, I never observed any other traffic anywhere near this aircraft. The pilot was issued his full clearance and climbed to his requested altitude.

Original NASA ASRS Text

Title: SMA X HAD NMAC WITH UNKNOWN ACFT.

Narrative: SMA X, A C-180/R, CALLED VFR REQUESTING HIS IFR TO INT. I IDENTED THE ACFT 3 MI FROM MY AIRSPACE BOUNDARY WITH ZTL AND ISSUED A SHORT RANGE CLRNC TO CONTAIN HIM IN MY AIRSPACE. AFTER COORDINATING WITH THE CTR SECTOR I WENT BACK TO THE CESSNA TO ISSUE HIS FULL CLRNC. THE ACFT WAS NOW IN THE VICINITY OF THE GUINNETT NDB AT 3000 FT MSL. SMA X ADVISED HE HAD JUST HAD A NEAR MISS. DUE TO POOR RADAR COVERAGE IN THIS AREA, I NEVER OBSERVED ANY OTHER TFC ANYWHERE NEAR THIS ACFT. THE PLT WAS ISSUED HIS FULL CLRNC AND CLBED TO HIS REQUESTED ALT.

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.