Aircraft climbing to 11000' came very close to an aircraft at 10000'.

Attributes
ACN	157901
Time
Date	199009
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl tower : sfo
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	157901
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 450
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small aircraft was 30 south of atl climbing to 11000'. Traffic was pointed out by another controller level at 10000' navigating to columbus, GA. At this point I felt they were diverged and no problem existed. About 2 mins later I was going to switch small aircraft to atlanta center when I saw there was a problem and called the departure controller to see if he could turn his aircraft to avoid mine. He had already switched the aircraft to columbus approach.

Original NASA ASRS Text

Title: ACFT CLIMBING TO 11000' CAME VERY CLOSE TO AN ACFT AT 10000'.

Narrative: SMA WAS 30 S OF ATL CLBING TO 11000'. TFC WAS POINTED OUT BY ANOTHER CTLR LEVEL AT 10000' NAVIGATING TO COLUMBUS, GA. AT THIS POINT I FELT THEY WERE DIVERGED AND NO PROB EXISTED. ABOUT 2 MINS LATER I WAS GOING TO SWITCH SMA TO ATLANTA CTR WHEN I SAW THERE WAS A PROB AND CALLED THE DEP CTLR TO SEE IF HE COULD TURN HIS ACFT TO AVOID MINE. HE HAD ALREADY SWITCHED THE ACFT TO COLUMBUS APCH.

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.