Las tower controller reported possible loss of separation involving two successive departures.

Attributes
ACN	745833
Time
Date	200706
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : las.tower
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : las.tower
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
ASRS Report	745833
Events
Anomaly	conflict : ground less severe non adherence : far non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 5000
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Aircraft X and aircraft Y were both cleared for takeoff on runway 25R. Both aircraft were still on departure roll; not airborne -- a violation of FAA 7110.65 3-9-6A. Asde equipment could be used to corroborate the loss of separation.

Original NASA ASRS Text

Title: LAS TWR CTLR REPORTED POSSIBLE LOSS OF SEPARATION INVOLVING TWO SUCCESSIVE DEPS.

Narrative: ACFT X AND ACFT Y WERE BOTH CLRED FOR TKOF ON RWY 25R. BOTH ACFT WERE STILL ON DEP ROLL; NOT AIRBORNE -- A VIOLATION OF FAA 7110.65 3-9-6A. ASDE EQUIP COULD BE USED TO CORROBORATE THE LOSS OF SEPARATION.

Data retrieved from NASA's ASRS site as of January 2009 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.