Controller cleared aircraft X for takeoff and immediately cleared aircraft Y for takeoff on a diagonal runway. Aircraft passed with less than standard separation.

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Attributes
ACN	144229
Time
Date	199005
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : yip
State Reference	MI
Altitude	msl bound lower : 1200 msl bound upper : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : yip
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : takeoff
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : takeoff
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	144229
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small aircraft X cleared for takeoff runway 27L, straight out westbound. Small aircraft Y then cleared for immediate takeoff runway 23L (intersecting runways) with an medium large transport on short final to runway 23L. At the time small aircraft Y became airborne, small aircraft X was approximately at midfield on its upwind. Small aircraft Y passed behind small aircraft X at the point of the runway's intersection. Neither of the pilots nor I made any comments on frequency re: the occurrence.

Original NASA ASRS Text

Title: CTLR CLEARED ACFT X FOR TKOF AND IMMEDIATELY CLEARED ACFT Y FOR TKOF ON A DIAGONAL RWY. ACFT PASSED WITH LESS THAN STANDARD SEPARATION.

Narrative: SMA X CLRED FOR TKOF RWY 27L, STRAIGHT OUT WBND. SMA Y THEN CLRED FOR IMMEDIATE TKOF RWY 23L (INTERSECTING RWYS) WITH AN MLG ON SHORT FINAL TO RWY 23L. AT THE TIME SMA Y BECAME AIRBORNE, SMA X WAS APPROX AT MIDFIELD ON ITS UPWIND. SMA Y PASSED BEHIND SMA X AT THE POINT OF THE RWY'S INTXN. NEITHER OF THE PLTS NOR I MADE ANY COMMENTS ON FREQ RE: THE OCCURRENCE.

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.