Date: 201509
Local time of day: 1201-1800
Location: PDK.Airport, GA
Flight conditions: VMC
Weather elements / visibility: Thunderstorm; 6
Light: Daylight
Aircraft: Medium Transport; Low Wing; 2 Turbojet Eng
Operator: Fractional
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Final Approach
Airspace: Class D PDK
ATC / advisory: Tower PDK
Second aircraft: Small Aircraft
Reporter organization: Fractional
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Communication Breakdown; Time Pressure; Situational Awareness
Second reporter function: Pilot Not Flying; First Officer
Anomaly: ATC Issue All Types; Conflict NMAC
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Contributing factors: Human Factors; Procedure; Airport
Primary problem: Procedure

Narrative: On short final to Runway 3R at PDK; a small low wing airplane attempting to land on Rwy 3L overshot his landing runway centerline and nearly missed our aircraft. The passengers onboard my aircraft were noticeably concerned; as well as all three crew members who witnessed the near miss. The small airplane missed our aircraft by approximately 250 lateral feet and approximately 50 vertical feet. The SIC contacted the tower upon landing and expressed his concerns. Initially the tower operator tried to say that these things happened every day at PDK and that it was the second busiest airport in Georgia. Blah; blah; blah! (No humor intended!); and that it was not a problem.When using parallel runways that are very close together; traffic information; heads up information; and possible de-confliction information would have been nice to hear and get!


Second narrative: On short final approximately 2 miles and 1;000 ft MSL I brought my scan from looking out on final to inside at the instruments and noticed a TCAS target at about 11 o'clock less than a mile and at our altitude. I looked back outside and visually acquired a low wing on a perpendicular collision course with us. As I was telling the flying pilot about the traffic and to turn; the small aircraft turned to the left for final on the left runway. At this time the tower told us of the traffic; (first time mentioned) and he would be on the parallel runway. I replied that the other pilot needed to make a harder turn now! We continued on course for an uneventful landing. The runways are maybe 500 ft apart. The traffic seemed closer at about 250 ft from us. I was able to hear a passenger in the cabin shout out about the aircraft and was visibly shaken by the ordeal. I spoke by phone to the tower cab and then I believe the tower chief about the event. They reviewed the radar and tapes and agreed it was close and consider it a near miss. The tower left the separation of aircraft up to the crews but we were never notified of the other aircraft. With runways so close the tower still needs to provide separation between us. The controller should have extended the small aircraft on downwind to turn base after US.


Synopsis: A jet on short final to PDK Runway 3R had a near miss with a single engine aircraft which overshot it's final turn to Runway 3L. ATC made no attempt at notifying either aircraft of the traffic.