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

Attributes
ACN	259903
Time
Date	199312
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 7200 msl bound upper : 7200
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : den tower : den
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 10
ASRS Report	259903
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

Departed air carrier X heading 350 degrees then departed air carrier Y on a 010 degree heading. Air carrier X eventually was to join V160 (den 046 degree radial), air carrier Y was to join J44 (den 062 degree radial). Departure violated facility noise abatement procedures and operating procedures by turning air carrier X eastbound at 7100 ft MSL. That put air carrier X in direct conflict with air carrier Y. I immediately called departure and told him to turn air carrier Y immediately to avoid air carrier X. The conflict alert went off. Air carrier Y passed just behind (west) of air carrier X. I informed the tower supervisor of this event.

Original NASA ASRS Text

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

Narrative: DEPARTED ACR X HDG 350 DEGS THEN DEPARTED ACR Y ON A 010 DEG HDG. ACR X EVENTUALLY WAS TO JOIN V160 (DEN 046 DEG RADIAL), ACR Y WAS TO JOIN J44 (DEN 062 DEG RADIAL). DEP VIOLATED FACILITY NOISE ABATEMENT PROCS AND OPERATING PROCS BY TURNING ACR X EBOUND AT 7100 FT MSL. THAT PUT ACR X IN DIRECT CONFLICT WITH ACR Y. I IMMEDIATELY CALLED DEP AND TOLD HIM TO TURN ACR Y IMMEDIATELY TO AVOID ACR X. THE CONFLICT ALERT WENT OFF. ACR Y PASSED JUST BEHIND (W) OF ACR X. I INFORMED THE TWR SUPVR OF THIS EVENT.

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.