TRACON departure controller has B757 on go around and plans vector to north and east of airport. Not seeing any aircraft in proposed departure list, he initiates vector north. A non ARTS displayed B737 reports on frequency at same altitude of climbing B757, passing behind go around B757 traffic and separation is lost.

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Attributes
ACN	407783
Time
Date	199807
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	landing : go around
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller radar : 14
ASRS Report	407783
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X on departure and air carrier Y on missed approach. Air carrier Y on vector west of lax with expectation of turning north for sequencing back to downwind. Run down list of lax departures showed no planned departures from either complex. Air carrier Y is turned to a heading of 330 degrees and climbed from 2000 ft MSL to 5000 ft MSL, at a point 5 mi west of lax. As air carrier Y completes his turn and is leaving 3000 ft a data tag displays and a check in call is made by air carrier X. Air carrier X was an unexpected departure since there were no planned departures in the run down checklist. Air carrier X is approximately 5 mi west of lax and reports level at 3000 ft. Although courses of air carrier X and air carrier Y have diverged, separation is 1.5 mi horizontal.

Original NASA ASRS Text

Title: TRACON DEP CTLR HAS B757 ON GAR AND PLANS VECTOR TO N AND E OF ARPT. NOT SEEING ANY ACFT IN PROPOSED DEP LIST, HE INITIATES VECTOR N. A NON ARTS DISPLAYED B737 RPTS ON FREQ AT SAME ALT OF CLBING B757, PASSING BEHIND GAR B757 TFC AND SEPARATION IS LOST.

Narrative: ACR X ON DEP AND ACR Y ON MISSED APCH. ACR Y ON VECTOR W OF LAX WITH EXPECTATION OF TURNING N FOR SEQUENCING BACK TO DOWNWIND. RUN DOWN LIST OF LAX DEPS SHOWED NO PLANNED DEPS FROM EITHER COMPLEX. ACR Y IS TURNED TO A HDG OF 330 DEGS AND CLBED FROM 2000 FT MSL TO 5000 FT MSL, AT A POINT 5 MI W OF LAX. AS ACR Y COMPLETES HIS TURN AND IS LEAVING 3000 FT A DATA TAG DISPLAYS AND A CHK IN CALL IS MADE BY ACR X. ACR X WAS AN UNEXPECTED DEP SINCE THERE WERE NO PLANNED DEPS IN THE RUN DOWN CHKLIST. ACR X IS APPROX 5 MI W OF LAX AND RPTS LEVEL AT 3000 FT. ALTHOUGH COURSES OF ACR X AND ACR Y HAVE DIVERGED, SEPARATION IS 1.5 MI HORIZ.

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.