Flight crew in B737 on an arrival route were issued a VFR TA and then given a frequency change. The crew apparently received a TCASII TA on the traffic and took evasive action.

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Attributes
ACN	413869
Time
Date	199809
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : fim
State Reference	CA
Altitude	msl bound lower : 14000 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 20000 flight time type : 10000
ASRS Report	413869
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 550 vertical : 350
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were issued VFR TA at 14500 ft or 16500 ft. We acknowledged traffic. We were then given a frequency change. During this time, we made a turn onto the sadde 6 arrival. It was here that I realized that we were on what appeared to be a collision course with the other aircraft. I was the PF and as such, took evasive action. We missed the aircraft by just a few hundred ft.

Original NASA ASRS Text

Title: FLC IN B737 ON AN ARR RTE WERE ISSUED A VFR TA AND THEN GIVEN A FREQ CHANGE. THE CREW APPARENTLY RECEIVED A TCASII TA ON THE TFC AND TOOK EVASIVE ACTION.

Narrative: WE WERE ISSUED VFR TA AT 14500 FT OR 16500 FT. WE ACKNOWLEDGED TFC. WE WERE THEN GIVEN A FREQ CHANGE. DURING THIS TIME, WE MADE A TURN ONTO THE SADDE 6 ARR. IT WAS HERE THAT I REALIZED THAT WE WERE ON WHAT APPEARED TO BE A COLLISION COURSE WITH THE OTHER ACFT. I WAS THE PF AND AS SUCH, TOOK EVASIVE ACTION. WE MISSED THE ACFT BY JUST A FEW HUNDRED 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.