Laf local controller described loss of separation event when ZAU failed to coordinate and clearance ...

Attributes
ACN	830823
Time
Date	200904
Local Time Of Day	1201-1800
Place
Locale Reference	LAF.Airport
State Reference	IN
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cardinal 177/177RG
Flight Phase	Initial Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C 210D
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Non Radar 2 Flight Crew Total 815
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict

Narrative:

I cleared aircraft X for takeoff from runway 5. Issued IFR departure instructions to climb on course to 5;000 ft to the northeast with instructions from ZAU. I frequency changed aircraft X. Several minutes later; aircraft Y called ready for departure and was given a release from center to climb on course to 3;000 ft to the northeast; and I cleared the aircraft for takeoff. At this time; center was already talking to aircraft X who was assigned 5;000 ft when aircraft Y was cleared for takeoff. Center stopped the first departure (aircraft X) at 3;000 ft and did not notify the tower. No headings were provided by the center for course divergence. I frequency changed aircraft Y.

Original NASA ASRS Text

Title: LAF Local Controller described loss of separation event when ZAU failed to coordinate and clearance changes for two successive departures.

Narrative: I cleared Aircraft X for takeoff from Runway 5. Issued IFR departure instructions to climb on course to 5;000 FT to the northeast with instructions from ZAU. I frequency changed Aircraft X. Several minutes later; Aircraft Y called ready for departure and was given a release from Center to climb on course to 3;000 FT to the northeast; and I cleared the aircraft for takeoff. At this time; Center was already talking to Aircraft X who was assigned 5;000 FT when Aircraft Y was cleared for takeoff. Center stopped the first departure (Aircraft X) at 3;000 FT and did not notify the Tower. No headings were provided by the Center for course divergence. I frequency changed Aircraft Y.

Data retrieved from NASA's ASRS site as of April 2012 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.

Laf local controller described loss of separation event when ZAU failed to coordinate and clearance changes for two successive departures.