Air Traffic Control Fully Certified
Situational Awareness; Communication Breakdown; Confusion
ATC Issue All Types; Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance
Flight Crew Took Evasive Action
Airspace Structure; Human Factors; Procedure
The ATL inbound was level at 13;000 FT. The VFR aircraft was at 15;500 FT and began an unexpected descent into the inbound. The inbound then responded to an RA and descended to 12;500. I did not call traffic due to the 2;500 FT altitude difference. I do feel the VFR aircraft had veered too close to the ATL inbound stream. I feel the VFR Jump planes should be on the DALAS frequency. Also increased training for the VFR pilots operating in that airspace.
I took a briefing from the Controller at R1 and was informed that I had a jump plane on frequency and I was waiting for him to ask for advisories. It appeared to be level flight at 155. Sector 5 had an arrival at 130 flying underneath the jump plane. The jump plane then descended right on top of the B737. The B737 reported a RA and descended without incident. The jump plane process should be re-evaluated and maybe DALAS Sector should talk to the jump planes or the flight path of the jump planes should be further South/West of the ERLIN corridor.
ZTL Controller described a TCAS RA event between an ATL Air Carrier arrival and a parachute jump aircraft operating near the arrival route; the reporter suggesting the jump aircraft be assigned a different frequency and provided with more awareness training.