Air carrier X had less than standard separation from air carrier Y. System error.

Attributes
ACN	276715
Time
Date	199406
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : atl tower : atl
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8900 flight time type : 4100
ASRS Report	276715
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 4000 flight time type : 1500
ASRS Report	276482
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Tower cleared air carrier X for takeoff and after takeoff turn to heading 250 degrees at the MM on the east end of runway 26L. After checking in with departure control, we were told to turn immediately to heading 300 degrees. (Departure called us by wrong company call sign) due to conflicting traffic inside 1 NM. The traffic was departing from the other side of airport runways 27. We turned to 300 degree heading but could see the other aircraft air carrier Y (brazilia) off our left wing. The altitude at the time of the call was about 3000 ft MSL. As the targets were reported merged by departure we called our altitude of 3500 ft to help with separation. We were cleared en route with no further action. Normally, departure from runway 26L/right from altitude heading 280 degrees is assigned by tower at MM. Both aircraft may have been assigned merging tracks. Tower error? Corrective action: ensure aircraft taking off parallel runways are assigned heading to increase separation.

Original NASA ASRS Text

Title: ACR X HAD LTSS FROM ACR Y. SYS ERROR.

Narrative: TWR CLRED ACR X FOR TKOF AND AFTER TKOF TURN TO HDG 250 DEGS AT THE MM ON THE E END OF RWY 26L. AFTER CHKING IN WITH DEP CTL, WE WERE TOLD TO TURN IMMEDIATELY TO HDG 300 DEGS. (DEP CALLED US BY WRONG COMPANY CALL SIGN) DUE TO CONFLICTING TFC INSIDE 1 NM. THE TFC WAS DEPARTING FROM THE OTHER SIDE OF ARPT RWYS 27. WE TURNED TO 300 DEG HDG BUT COULD SEE THE OTHER ACFT ACR Y (BRAZILIA) OFF OUR L WING. THE ALT AT THE TIME OF THE CALL WAS ABOUT 3000 FT MSL. AS THE TARGETS WERE RPTED MERGED BY DEP WE CALLED OUR ALT OF 3500 FT TO HELP WITH SEPARATION. WE WERE CLRED ENRTE WITH NO FURTHER ACTION. NORMALLY, DEP FROM RWY 26L/R FROM ALT HDG 280 DEGS IS ASSIGNED BY TWR AT MM. BOTH ACFT MAY HAVE BEEN ASSIGNED MERGING TRACKS. TWR ERROR? CORRECTIVE ACTION: ENSURE ACFT TAKING OFF PARALLEL RWYS ARE ASSIGNED HDG TO INCREASE SEPARATION.

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.