B737 crew on vector at 3000 ft to oak encounter climbing sel traffic just outside class C airspace.

Attributes
ACN	585153
Time
Date	200306
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : oak.airport
State Reference	CA
Altitude	msl bound lower : 2500 msl bound upper : 3000
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	tracon : nct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 29
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	departure : vfr
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	585153
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	585150
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : far non adherence : company policies other anomaly other
Independent Detector	atc equipment other atc equipment : radar mode c other controllera other flight crewa other flight crewb other other : 3
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	vertical : 400
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance
Primary Problem	Airspace Structure

Narrative:

At 3000 ft, on vector to intercept the oak ILS runway 29, localizer. Approach pointed out 10 O'clock position low, climbing traffic. Got him visually and then we had an RA (at 10-15 seconds after approach call). The RA had us climbing but I thought that climbing with a climbing conflict would put us at risk! So I descended at 400-500 ft and traffic passed behind and above. Traffic saw us finally and turned right to increase separation. Traffic was single engine, low wing. After an uneventful landing at oak, several passenger commented on the closeness of our conflict!

Original NASA ASRS Text

Title: B737 CREW ON VECTOR AT 3000 FT TO OAK ENCOUNTER CLBING SEL TFC JUST OUTSIDE CLASS C AIRSPACE.

Narrative: AT 3000 FT, ON VECTOR TO INTERCEPT THE OAK ILS RWY 29, LOC. APCH POINTED OUT 10 O'CLOCK POS LOW, CLBING TFC. GOT HIM VISUALLY AND THEN WE HAD AN RA (AT 10-15 SECONDS AFTER APCH CALL). THE RA HAD US CLBING BUT I THOUGHT THAT CLBING WITH A CLBING CONFLICT WOULD PUT US AT RISK! SO I DSNDED AT 400-500 FT AND TFC PASSED BEHIND AND ABOVE. TFC SAW US FINALLY AND TURNED R TO INCREASE SEPARATION. TFC WAS SINGLE ENG, LOW WING. AFTER AN UNEVENTFUL LNDG AT OAK, SEVERAL PAX COMMENTED ON THE CLOSENESS OF OUR CONFLICT!

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.