A widebody transport jet on approach to lax received a TCASII RA, showing an aircraft approximately 100 ft below the jet. After climbing 1200 ft, the widebody transport descended to intercept the GS. Descending, the jet received another TCASII alert, and queried approach control. Approach control then advised the jet of another aircraft conducting a visual approach in the same vicinity. Captain concerned of non issuance of traffic and the position of the other aircraft.

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Attributes
ACN	393727
Time
Date	199802
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 4200
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 20000
ASRS Report	393727
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : clearance non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

On descent into lax, we were given clearance to change from runway 25L to runway 25R. On descent, we observed amber on the TCASII and then red with a command 'climb.' as I added power and started the climb, the TCASII showed the aircraft 100 ft below and appeared directly below. We were approximately 3000 ft and climbed to 4200 ft. I thought it was probably a helicopter VFR and had passed the traffic. We started our descent. As we were capturing the GS, we once again got a warning on TCASII. We were never advised by approach control of the traffic, until I inquired. I was told that it was a commuter on a visual. I called approach control on the ground and was advised of four conflicts with the commuter aircraft. I feel I should have been advised of the traffic and that the commuter being on a visual, should have been giving me more space. We never saw the commuter.

Original NASA ASRS Text

Title: A WDB JET ON APCH TO LAX RECEIVED A TCASII RA, SHOWING AN ACFT APPROX 100 FT BELOW THE JET. AFTER CLBING 1200 FT, THE WDB DSNDED TO INTERCEPT THE GS. DSNDING, THE JET RECEIVED ANOTHER TCASII ALERT, AND QUERIED APCH CTL. APCH CTL THEN ADVISED THE JET OF ANOTHER ACFT CONDUCTING A VISUAL APCH IN THE SAME VICINITY. CAPT CONCERNED OF NON ISSUANCE OF TFC AND THE POS OF THE OTHER ACFT.

Narrative: ON DSCNT INTO LAX, WE WERE GIVEN CLRNC TO CHANGE FROM RWY 25L TO RWY 25R. ON DSCNT, WE OBSERVED AMBER ON THE TCASII AND THEN RED WITH A COMMAND 'CLB.' AS I ADDED PWR AND STARTED THE CLB, THE TCASII SHOWED THE ACFT 100 FT BELOW AND APPEARED DIRECTLY BELOW. WE WERE APPROX 3000 FT AND CLBED TO 4200 FT. I THOUGHT IT WAS PROBABLY A HELI VFR AND HAD PASSED THE TFC. WE STARTED OUR DSCNT. AS WE WERE CAPTURING THE GS, WE ONCE AGAIN GOT A WARNING ON TCASII. WE WERE NEVER ADVISED BY APCH CTL OF THE TFC, UNTIL I INQUIRED. I WAS TOLD THAT IT WAS A COMMUTER ON A VISUAL. I CALLED APCH CTL ON THE GND AND WAS ADVISED OF FOUR CONFLICTS WITH THE COMMUTER ACFT. I FEEL I SHOULD HAVE BEEN ADVISED OF THE TFC AND THAT THE COMMUTER BEING ON A VISUAL, SHOULD HAVE BEEN GIVING ME MORE SPACE. WE NEVER SAW THE COMMUTER.

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.