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

Attributes
ACN	174137
Time
Date	199103
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : ord
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : initial
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : initial
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
ASRS Report	174137
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 9600 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I had air carrier X, large transport depart on a 290 heading and cpr Y an light transport depart on the same heading. Air carrier X turned wide and cpr Y turned tight. Sep decreased to 1.6 mi and 600'. On departure I looked out the window before cpr Y started turn and saw the lights from air carrier X and it appeared as if I'd have sep. Was unable to look at the BRITE radar because of the radar blind spot within 1 1/2 to 2 mi of departure end of runway.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM CPR Y. SYSTEM ERROR.

Narrative: I HAD ACR X, LGT DEPART ON A 290 HDG AND CPR Y AN LTT DEPART ON THE SAME HDG. ACR X TURNED WIDE AND CPR Y TURNED TIGHT. SEP DECREASED TO 1.6 MI AND 600'. ON DEP I LOOKED OUT THE WINDOW BEFORE CPR Y STARTED TURN AND SAW THE LIGHTS FROM ACR X AND IT APPEARED AS IF I'D HAVE SEP. WAS UNABLE TO LOOK AT THE BRITE RADAR BECAUSE OF THE RADAR BLIND SPOT WITHIN 1 1/2 TO 2 MI OF DEP END OF RWY.

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.