A B762 crew, after being issued a TA from sct, received a 'descend' RA from TCASII.

Attributes
ACN	523390
Time
Date	200108
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 2500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25l other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 7500 flight time type : 1700
ASRS Report	523390
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 120 flight time total : 12100 flight time type : 600
ASRS Report	522430
Events
Anomaly	conflict : airborne critical non adherence : published procedure
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued advisory flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 750 vertical : 200
Supplementary
Problem Areas	ATC Human Performance Airport Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were cleared for ILS runway 25L at lax. TA was issued to us that aircraft Y (EMB120) was at our 9 O'clock position, would be vectored behind us for the visual to runway 25R. Visual was never established, but aircraft Y called us in sight. Shortly after that, we received an RA (2000 ft AGL) with the red DOT on top of our aircraft same altitude. TCASII commanded 1500 FPM down. Visual contact was not established with EMB120 until 1000 ft AGL with the EMB120 abeam right wing. At 1000 ft, we notified tower of RA. Then the EMB120 slowed up to increase separation. Supplemental information from acn 522430: descended and maintained 1/2 - 3/4 DOT GS low to keep aircraft vertical separation 200 ft. Did not see him visually until 1000 ft AGL. Filed near midair collision with tower.

Original NASA ASRS Text

Title: A B762 CREW, AFTER BEING ISSUED A TA FROM SCT, RECEIVED A 'DSND' RA FROM TCASII.

Narrative: WE WERE CLRED FOR ILS RWY 25L AT LAX. TA WAS ISSUED TO US THAT ACFT Y (EMB120) WAS AT OUR 9 O'CLOCK POS, WOULD BE VECTORED BEHIND US FOR THE VISUAL TO RWY 25R. VISUAL WAS NEVER ESTABLISHED, BUT ACFT Y CALLED US IN SIGHT. SHORTLY AFTER THAT, WE RECEIVED AN RA (2000 FT AGL) WITH THE RED DOT ON TOP OF OUR ACFT SAME ALT. TCASII COMMANDED 1500 FPM DOWN. VISUAL CONTACT WAS NOT ESTABLISHED WITH EMB120 UNTIL 1000 FT AGL WITH THE EMB120 ABEAM R WING. AT 1000 FT, WE NOTIFIED TWR OF RA. THEN THE EMB120 SLOWED UP TO INCREASE SEPARATION. SUPPLEMENTAL INFO FROM ACN 522430: DSNDED AND MAINTAINED 1/2 - 3/4 DOT GS LOW TO KEEP ACFT VERT SEPARATION 200 FT. DID NOT SEE HIM VISUALLY UNTIL 1000 FT AGL. FILED NMAC WITH TWR.

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.