B767 on lax mitts STAR executed TCASII RA due to same altitude conflicting DC10.

Attributes
ACN	511738
Time
Date	200105
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : mitts
State Reference	CA
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : contact
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : contact
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 17000 flight time type : 2130
ASRS Report	511738
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	airspace violation : entry altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : published procedure non adherence : required legal separation other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued advisory flight crew : took evasive action flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew other
Miss Distance	horizontal : 9000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were flying the mitts 1 arrival for lax approaching mitts, descending to 10000 ft. A DC10 was approaching arnes intersection also at 10000 ft on the civet 4 arrival. He was apparently intercepting on the 277 degree radial from pdz VOR. We saw him coming from our left and saw that he was getting closer. As I was about to have the first officer ask ATC about him, we got a climb RA which we followed. We informed ATC and he said that the other aircraft had us in sight. We don't know if this happened because he was intercepting at that angle or if he had overshot the localizer. After landing, I called the ATC supervisor and he said he had not heard of this occurrence. He said that the controller probably should have staggered the 2 aircraft or had one of us stay at a higher altitude and that he would speak to him about it. I also called the duty flight manager and he suggested I file this report and send an e-note. We did not seem closer than 1.5 mi at our closest point.

Original NASA ASRS Text

Title: B767 ON LAX MITTS STAR EXECUTED TCASII RA DUE TO SAME ALT CONFLICTING DC10.

Narrative: WE WERE FLYING THE MITTS 1 ARR FOR LAX APCHING MITTS, DSNDING TO 10000 FT. A DC10 WAS APCHING ARNES INTXN ALSO AT 10000 FT ON THE CIVET 4 ARR. HE WAS APPARENTLY INTERCEPTING ON THE 277 DEG RADIAL FROM PDZ VOR. WE SAW HIM COMING FROM OUR L AND SAW THAT HE WAS GETTING CLOSER. AS I WAS ABOUT TO HAVE THE FO ASK ATC ABOUT HIM, WE GOT A CLB RA WHICH WE FOLLOWED. WE INFORMED ATC AND HE SAID THAT THE OTHER ACFT HAD US IN SIGHT. WE DON'T KNOW IF THIS HAPPENED BECAUSE HE WAS INTERCEPTING AT THAT ANGLE OR IF HE HAD OVERSHOT THE LOC. AFTER LNDG, I CALLED THE ATC SUPVR AND HE SAID HE HAD NOT HEARD OF THIS OCCURRENCE. HE SAID THAT THE CTLR PROBABLY SHOULD HAVE STAGGERED THE 2 ACFT OR HAD ONE OF US STAY AT A HIGHER ALT AND THAT HE WOULD SPEAK TO HIM ABOUT IT. I ALSO CALLED THE DUTY FLT MGR AND HE SUGGESTED I FILE THIS RPT AND SEND AN E-NOTE. WE DID NOT SEEM CLOSER THAN 1.5 MI AT OUR CLOSEST POINT.

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.