Air carrier X TCASII RA from aircraft Y. Non adherence to ATC clearance descend. Evasive action take...

Attributes
ACN	245403
Time
Date	199307
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sli
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna tower : sna tower : aus
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller radar : 5
ASRS Report	245403
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Small aircraft tower released 3 aircraft same route that were not compatible (i.e., slow, faster, fastest). I found myself vectoring for separation. The first aircraft Y had to go about 20 NM west opposite direction to lax departure traffic. Air carrier X off lax was climbing through 9000 ft slowly towards the first aircraft Y. I turned the aircraft sbound away from air carrier X, but air carrier X received a TCASII alert and began descent on his own, even though the 2 were diverging. Recommend towers sequence departures on the ground for speed compatibility to avoid airborne conflicts.

Original NASA ASRS Text

Title: ACR X TCASII RA FROM ACFT Y. NON ADHERENCE TO ATC CLRNC DSND. EVASIVE ACTION TAKEN.

Narrative: SMA TWR RELEASED 3 ACFT SAME RTE THAT WERE NOT COMPATIBLE (I.E., SLOW, FASTER, FASTEST). I FOUND MYSELF VECTORING FOR SEPARATION. THE FIRST ACFT Y HAD TO GO ABOUT 20 NM W OPPOSITE DIRECTION TO LAX DEP TFC. ACR X OFF LAX WAS CLBING THROUGH 9000 FT SLOWLY TOWARDS THE FIRST ACFT Y. I TURNED THE ACFT SBOUND AWAY FROM ACR X, BUT ACR X RECEIVED A TCASII ALERT AND BEGAN DSCNT ON HIS OWN, EVEN THOUGH THE 2 WERE DIVERGING. RECOMMEND TWRS SEQUENCE DEPS ON THE GND FOR SPD COMPATIBILITY TO AVOID AIRBORNE CONFLICTS.

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.

Air carrier X TCASII RA from aircraft Y. Non adherence to ATC clearance descend. Evasive action taken.