Slc local controller experienced operational error when second departure aircraft overtook first.

Attributes
ACN	635559
Time
Date	200410
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : slc.airport
State Reference	UT
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s56.tracon tower : skbo.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : s56.tracon tower : slc.tower
Operator	general aviation : personal
Make Model Name	Gulfstream V
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller limited radar : 1 controller non radar : 5 controller radar : 3
ASRS Report	635559
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Carj departed slc on a 280 degree heading, G5 departed slc on a 280 degree heading and more than 3 mi longitudinal separation existed with lead aircraft (carj) 20 KTS faster. The carj did not continue accelerating (may have even slowed in climb) and G5 gained on the carj until separation was lost west of slc airport. The TRACON controller was busy coordinating with another TRACON sector and failed to notice the situation deteriorating.

Original NASA ASRS Text

Title: SLC LCL CTLR EXPERIENCED OPERROR WHEN SECOND DEP ACFT OVERTOOK FIRST.

Narrative: CARJ DEPARTED SLC ON A 280 DEG HDG, G5 DEPARTED SLC ON A 280 DEG HDG AND MORE THAN 3 MI LONGITUDINAL SEPARATION EXISTED WITH LEAD ACFT (CARJ) 20 KTS FASTER. THE CARJ DID NOT CONTINUE ACCELERATING (MAY HAVE EVEN SLOWED IN CLB) AND G5 GAINED ON THE CARJ UNTIL SEPARATION WAS LOST W OF SLC ARPT. THE TRACON CTLR WAS BUSY COORDINATING WITH ANOTHER TRACON SECTOR AND FAILED TO NOTICE THE SIT DETERIORATING.

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.