Narrative:

A BE40 departed vgt airport via NOTWN2 SID. The aircraft was assigned an unrestricted climb to 17;000 ft. The aircraft made the initial turn heading 250 degrees to join the las R-313 outbound. The aircraft flew through the radial and I asked 'verify you are in a right turn to join the las 313 degree radial?' the aircraft replied 'affirmative.' the aircraft did not make a right turn to intercept but continued southwest and eventually started a left turn. At this time; I instructed my trainee to amend the BE40's altitude to 9;000 ft and turn the aircraft south; away from arrival aircraft inbound to las and terrain and to parallel departures off of las. Additional traffic inbound to the vgt airport from the south was a P180 at 10;000 ft. The BE40 climbed to 10;000 ft and was told repeatedly to descend to 9;000 ft and traffic was issued about the P180. The BE40 had still not started a descent when the P180 was instructed to turn northwest heading 340 degrees. The P180 could not be turned further left due to terrain or climbed due to traffic inbound to las. The BE40 and the P180 were issued traffic alert advisories. The BE40 then began descending. At the time of the occurrence; it appeared that minimum separation had been maintained. However; after advising my supervisor of the occurrence; and watching the replay; minimum separation may not have been maintained. Supplemental information from acn 816285: departed from vgt on NOTWN2 SID. FMS engaged turn; took control of aircraft and reestablished SID. ATC assigned FL190; then 17;000 ft; then 9;000 ft during climb -- aircraft was passing approximately 9;200 ft MSL in climb when new altitude assigned; ATC assigned heading 180 degrees at same time. FMS/autopilot didn't capture new altitude because of being above assigned altitude -- multiple radio calls masked assigned altitude within cockpit. Established 180 degree heading; ATC announced traffic at 12 O'clock; 10;000 ft. Traffic crossing left to right approximately 3 NM away -- TCAS issued 'TA' announcement and yellow circle over traffic. Took control of aircraft; visually acquired traffic; and descent and turned away to ensure visual separation. No imminent danger. Visual separation with other aircraft was maintained.

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Original NASA ASRS Text

Title: L30 controller described conflict event when departure; assigned NOTWN2; initially turned the wrong direction; was corrected by ATC; assigned several intermediate altitudes; but eventually resulted in questionable separation.

Narrative: A BE40 departed VGT Airport via NOTWN2 SID. The aircraft was assigned an unrestricted climb to 17;000 FT. The aircraft made the initial turn heading 250 degrees to join the LAS R-313 outbound. The aircraft flew through the radial and I asked 'verify you are in a right turn to join the LAS 313 degree radial?' The aircraft replied 'affirmative.' The aircraft did not make a right turn to intercept but continued southwest and eventually started a left turn. At this time; I instructed my trainee to amend the BE40's altitude to 9;000 FT and turn the aircraft south; away from arrival aircraft inbound to LAS and terrain and to parallel departures off of LAS. Additional traffic inbound to the VGT Airport from the south was a P180 at 10;000 FT. The BE40 climbed to 10;000 FT and was told repeatedly to descend to 9;000 FT and traffic was issued about the P180. The BE40 had still not started a descent when the P180 was instructed to turn northwest heading 340 degrees. The P180 could not be turned further left due to terrain or climbed due to traffic inbound to LAS. The BE40 and the P180 were issued traffic alert advisories. The BE40 then began descending. At the time of the occurrence; it appeared that minimum separation had been maintained. However; after advising my Supervisor of the occurrence; and watching the replay; minimum separation may not have been maintained. Supplemental information from ACN 816285: Departed from VGT on NOTWN2 SID. FMS engaged turn; took control of aircraft and reestablished SID. ATC assigned FL190; then 17;000 FT; then 9;000 FT during climb -- aircraft was passing approximately 9;200 FT MSL in climb when new altitude assigned; ATC assigned heading 180 degrees at same time. FMS/Autopilot didn't capture new altitude because of being above assigned altitude -- multiple radio calls masked assigned altitude within cockpit. Established 180 degree heading; ATC announced traffic at 12 O'clock; 10;000 FT. Traffic crossing left to right approximately 3 NM away -- TCAS issued 'TA' announcement and yellow circle over traffic. Took control of aircraft; visually acquired traffic; and descent and turned away to ensure visual separation. No imminent danger. Visual separation with other aircraft was maintained.

Data retrieved from NASA's ASRS site as of May 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.