Las controller providing OJT experienced an operational error when jet traffic was released followin...

Narrative:

Departing runway's 1L/right; landing runway's 1L/right. While performing ojti; a jet departed behind a piston aircraft and approximately 1 mile off the departure end of the runway separation was lost. Currently; procedures at las require that while in configuration #3; for any VFR prop departure; the tower must call for release (crash fire rescue equipment). The AL2 position was staffed; therefore; AL2 coordinated the release. However; 1 min and 15 seconds after issuing the piston a takeoff clearance; a jet was issued a takeoff clearance. Both aircraft received the same clearance instructions to turn right heading 050 on departure. Because of the aircraft speeds; the jet caught the piston and separation was lost. It is my belief that the current procedures in regards to the LOA for L30 and las need to be amended. Currently the LOA with L30 states that las will crash fire rescue equipment any subsequent departure into the affected sector after an IFR prop departs. Additionally; las will crash fire rescue equipment any VFR prop prior to departure; but does not require las to crash fire rescue equipment for departures after the VFR. While I recognize the issue with the overtake a loss of separation could have been avoided by withholding a take off clearance for the jet; the confusion between L30 and las regarding weather or not to crash fire rescue equipment VFR vs. IFR props is constantly an issue.

Original NASA ASRS Text

Title: LAS controller providing OJT experienced an operational error when jet traffic was released following a propeller aircraft; the confusing release procedures between LAS and L30 listed as a causal factor.

Narrative: Departing Runway's 1L/R; landing Runway's 1L/R. While performing OJTI; a jet departed behind a piston aircraft and approximately 1 mile off the departure end of the runway separation was lost. Currently; procedures at LAS require that while in configuration #3; for any VFR prop departure; the Tower must call for release (CFR). The AL2 position was staffed; therefore; AL2 coordinated the release. However; 1 min and 15 seconds after issuing the piston a takeoff clearance; a jet was issued a takeoff clearance. Both aircraft received the same clearance instructions to turn right heading 050 on departure. Because of the aircraft speeds; the jet caught the piston and separation was lost. It is my belief that the current procedures in regards to the LOA for L30 and LAS need to be amended. Currently the LOA with L30 states that LAS will CFR any subsequent departure into the affected sector after an IFR prop departs. Additionally; LAS will CFR any VFR prop prior to departure; but does not require LAS to CFR for departures after the VFR. While I recognize the issue with the overtake a loss of separation could have been avoided by withholding a take off clearance for the jet; the confusion between L30 and LAS regarding weather or not to CFR VFR vs. IFR props is constantly an issue.

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.

Attributes
ACN	859373
Time
Date	200911
Local Time Of Day	1801-2400
Place
Locale Reference	LAS.Airport
State Reference	NV
Aircraft 1
Make Model Name	Small Aircraft
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	VFR
Aircraft 2
Make Model Name	Light Transport
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Las controller providing OJT experienced an operational error when jet traffic was released following a propeller aircraft; the confusing release procedures between las and L30 listed as a causal factor.