Small transport bizjet and unknown aircraft had near midair collision near O69, ca.

Attributes
ACN	419188
Time
Date	199810
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : 069 airport : 069
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
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
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 135 flight time total : 6900 flight time type : 1700
ASRS Report	419188
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	other controllera other other : unspecified
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 100

Narrative:

We departed petaluma airport VFR and climbed straight out to 1200 ft MSL before commencing a turn left to proceed direct to sausalito VOR. About the time we initiated the turn, the first officer contacted ZOA to pick up our IFR flight plan into oakland. Upon making contact with ZOA we were given a squawk code. Simultaneously the controller advised a small single engine aircraft that we were passing off his left side about 1/2 mi. The pilot of the single engine aircraft replied 'if that's the jet that just left petaluma, he just went right over the top of me, about 100 ft.' neither myself not the first officer saw the other aircraft either before or after his report. Since we fly into the petaluma airport about 2-3 times per month, we are aware, and extremely vigilant regarding the numerous smaller and slower aircraft in the area, but we did not see this one! If the WX is VFR we always depart petaluma VFR and contact ZOA airborne, since it is almost impossible to contact them from the ground at petaluma. Once airborne, communication is normal. Because we did not see the other aircraft we do not know exactly where he was, nor the extent of vertical or horizontal separation.

Original NASA ASRS Text

Title: SMT BIZJET AND UNKNOWN ACFT HAD NMAC NEAR O69, CA.

Narrative: WE DEPARTED PETALUMA ARPT VFR AND CLBED STRAIGHT OUT TO 1200 FT MSL BEFORE COMMENCING A TURN L TO PROCEED DIRECT TO SAUSALITO VOR. ABOUT THE TIME WE INITIATED THE TURN, THE FO CONTACTED ZOA TO PICK UP OUR IFR FLT PLAN INTO OAKLAND. UPON MAKING CONTACT WITH ZOA WE WERE GIVEN A SQUAWK CODE. SIMULTANEOUSLY THE CTLR ADVISED A SMALL SINGLE ENG ACFT THAT WE WERE PASSING OFF HIS L SIDE ABOUT 1/2 MI. THE PLT OF THE SINGLE ENG ACFT REPLIED 'IF THAT'S THE JET THAT JUST LEFT PETALUMA, HE JUST WENT RIGHT OVER THE TOP OF ME, ABOUT 100 FT.' NEITHER MYSELF NOT THE FO SAW THE OTHER ACFT EITHER BEFORE OR AFTER HIS RPT. SINCE WE FLY INTO THE PETALUMA ARPT ABOUT 2-3 TIMES PER MONTH, WE ARE AWARE, AND EXTREMELY VIGILANT REGARDING THE NUMEROUS SMALLER AND SLOWER ACFT IN THE AREA, BUT WE DID NOT SEE THIS ONE! IF THE WX IS VFR WE ALWAYS DEPART PETALUMA VFR AND CONTACT ZOA AIRBORNE, SINCE IT IS ALMOST IMPOSSIBLE TO CONTACT THEM FROM THE GND AT PETALUMA. ONCE AIRBORNE, COM IS NORMAL. BECAUSE WE DID NOT SEE THE OTHER ACFT WE DO NOT KNOW EXACTLY WHERE HE WAS, NOR THE EXTENT OF VERT OR HORIZ SEPARATION.

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.