Less than standard separation between commuter and air carrier aircraft. Operational error.

Attributes
ACN	187523
Time
Date	199108
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 15800 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute airway : v459
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 2 flight time total : 1062
ASRS Report	187523
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 27600 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Commuter X was at 16000 northbound on V459. Air carrier Y was on loop departure at 15000. I thought Y would be more than 5 mi in front of X so I issued normal speed and climb to FL230 to air carrier Y. When I realized it was not going to work, I turned Y to a 010 heading, and turned aircraft X 30 degree left.

Original NASA ASRS Text

Title: LTSS BTWN COMMUTER AND ACR ACFT. OPERROR.

Narrative: COMMUTER X WAS AT 16000 NBOUND ON V459. ACR Y WAS ON LOOP DEP AT 15000. I THOUGHT Y WOULD BE MORE THAN 5 MI IN FRONT OF X SO I ISSUED NORMAL SPD AND CLB TO FL230 TO ACR Y. WHEN I REALIZED IT WAS NOT GOING TO WORK, I TURNED Y TO A 010 HDG, AND TURNED ACFT X 30 DEG L.

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.