Departure controller climbed an air carrier E120 to same altitude as a departing B737 who would conflict with the E120 when the B737 turned on his SID. The departure controller saw the potential conflict and tried to stop the E120 at 8000 ft, but separation was lost and the B737 reacted to a TCASII RA and had to descend back to his altitude before a second conflict occurred.

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Attributes
ACN	361382
Time
Date	199702
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 8000 msl bound upper : 8500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : lax tower : sff
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Xingu EMB-121 All Series
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position controller : approach
Qualification	controller : radar pilot : private
Experience	controller radar : 13 flight time total : 100
ASRS Report	361382
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	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 8000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

E120 was cleared to 9000 ft which placed it in conflict with the B737 when the B737 was turned north on departure SID. When the conflict was recognized, the E120 was issued traffic and told to maintain 8000 ft. The E120 continued to 8400 ft before starting back down. I should have been more insistent about the seriousness of the situation. The E120 pilot seemed to have taken his time leveling off the airplane. I am responsible for putting these aircraft in this situation, and did everything I could to resolve it. A quick push over to level at 8000 ft would have avoided this situation and kept the B737 TCASII RA from activating. After the B737 climbed on RA instructions, crossing traffic at 10000 ft was issued and the B737 descended back to 9000 ft.

Original NASA ASRS Text

Title: DEP CTLR CLBED AN ACR E120 TO SAME ALT AS A DEPARTING B737 WHO WOULD CONFLICT WITH THE E120 WHEN THE B737 TURNED ON HIS SID. THE DEP CTLR SAW THE POTENTIAL CONFLICT AND TRIED TO STOP THE E120 AT 8000 FT, BUT SEPARATION WAS LOST AND THE B737 REACTED TO A TCASII RA AND HAD TO DSND BACK TO HIS ALT BEFORE A SECOND CONFLICT OCCURRED.

Narrative: E120 WAS CLRED TO 9000 FT WHICH PLACED IT IN CONFLICT WITH THE B737 WHEN THE B737 WAS TURNED N ON DEP SID. WHEN THE CONFLICT WAS RECOGNIZED, THE E120 WAS ISSUED TFC AND TOLD TO MAINTAIN 8000 FT. THE E120 CONTINUED TO 8400 FT BEFORE STARTING BACK DOWN. I SHOULD HAVE BEEN MORE INSISTENT ABOUT THE SERIOUSNESS OF THE SIT. THE E120 PLT SEEMED TO HAVE TAKEN HIS TIME LEVELING OFF THE AIRPLANE. I AM RESPONSIBLE FOR PUTTING THESE ACFT IN THIS SIT, AND DID EVERYTHING I COULD TO RESOLVE IT. A QUICK PUSH OVER TO LEVEL AT 8000 FT WOULD HAVE AVOIDED THIS SIT AND KEPT THE B737 TCASII RA FROM ACTIVATING. AFTER THE B737 CLBED ON RA INSTRUCTIONS, XING TFC AT 10000 FT WAS ISSUED AND THE B737 DSNDED BACK TO 9000 FT.

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.