Light transport notified that air carrier had TCASII RA and took evasive action.

Attributes
ACN	272936
Time
Date	199406
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hwd
State Reference	CA
Altitude	msl bound lower : 3500 msl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	272936
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 4400
ASRS Report	272935
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During our VFR climb out of hwd en route to tvl out of 3500 ft MSL over dublin, we were asked by approach control (we were on flight following on 127.0 bay approach) if we had seen air carrier airlines. When we responded negatively, we were advised that he needed to take evasive action due to TCASII alert. We were both in VFR conditions in uncontrolled airspace. This reinforces the need to maintain greater vigilance when working in high density areas, to keep your eyes outside the cockpit. We contacted bay approach upon our return and asked them over the phone if there was anything we could do to remedy this in the future. They advised us to remain below 2500 ft until radar contact is actually made due to the fact that this area is their standard routing into oak out of the north.

Original NASA ASRS Text

Title: LTT NOTIFIED THAT ACR HAD TCASII RA AND TOOK EVASIVE ACTION.

Narrative: DURING OUR VFR CLB OUT OF HWD ENRTE TO TVL OUT OF 3500 FT MSL OVER DUBLIN, WE WERE ASKED BY APCH CTL (WE WERE ON FLT FOLLOWING ON 127.0 BAY APCH) IF WE HAD SEEN ACR AIRLINES. WHEN WE RESPONDED NEGATIVELY, WE WERE ADVISED THAT HE NEEDED TO TAKE EVASIVE ACTION DUE TO TCASII ALERT. WE WERE BOTH IN VFR CONDITIONS IN UNCTLED AIRSPACE. THIS REINFORCES THE NEED TO MAINTAIN GREATER VIGILANCE WHEN WORKING IN HIGH DENSITY AREAS, TO KEEP YOUR EYES OUTSIDE THE COCKPIT. WE CONTACTED BAY APCH UPON OUR RETURN AND ASKED THEM OVER THE PHONE IF THERE WAS ANYTHING WE COULD DO TO REMEDY THIS IN THE FUTURE. THEY ADVISED US TO REMAIN BELOW 2500 FT UNTIL RADAR CONTACT IS ACTUALLY MADE DUE TO THE FACT THAT THIS AREA IS THEIR STANDARD ROUTING INTO OAK OUT OF THE N.

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.