PA28 pilot on an IFR flight plan in VMC at 4;000 feet reported a near midair collision with another ...

Narrative:

Flight on an IFR flight plan in VMC conditions. I was level at 4000; being vectored to final on the RNAV 07; north of the field. The onboard traffic avoidance system alerted us to traffic approximately 300 feet below us; just off to the left. It was climbing and heading on approximately a 45 degree intercept course. The craft was near enough to both read the tail number and see into the cockpit. Atlanta approach ATC gave a call advising of another aircraft in the area; which they believed to be approximately 500 feet below us. By this time that was no longer the case; and I had already begun maneuvering to avoid a collision. I simply responded with 'traffic in sight;' while I focus on maneuvering. I climbed about 400 feet; and the traffic passed directly beneath us about 300 feet below. Once we visually confirmed no factor; I returned to my assigned altitude and heading. There were no more calls from ATC regarding the traffic; so I continued with the flight.

Original NASA ASRS Text

Title: PA28 pilot on an IFR flight plan in VMC at 4;000 feet reported a NMAC with another aircraft climbing out. An onboard traffic avoidance system and ATC advised the reporter of the traffic conflict.

Narrative: Flight on an IFR flight plan in VMC conditions. I was level at 4000; being vectored to final on the RNAV 07; north of the field. The onboard traffic avoidance system alerted us to traffic approximately 300 feet below us; just off to the left. It was climbing and heading on approximately a 45 degree intercept course. The craft was near enough to both read the tail number and see into the cockpit. Atlanta Approach ATC gave a call advising of another aircraft in the area; which they believed to be approximately 500 feet below us. By this time that was no longer the case; and I had already begun maneuvering to avoid a collision. I simply responded with 'traffic in sight;' while I focus on maneuvering. I climbed about 400 feet; and the traffic passed directly beneath us about 300 feet below. Once we visually confirmed no factor; I returned to my assigned altitude and heading. There were no more calls from ATC regarding the traffic; so I continued with the flight.

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.

Attributes
ACN	1392216
Time
Date	201610
Local Time Of Day	0001-0600
Place
Locale Reference	A80.TRACON
State Reference	GA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Total 140
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0 Vertical 300

PA28 pilot on an IFR flight plan in VMC at 4;000 feet reported a near midair collision with another aircraft climbing out. An onboard traffic avoidance system and ATC advised the reporter of the traffic conflict.