Narrative:

Our aircraft was climbing to our initial assigned altitude in our IFR clearance of 4000 ft MSL. We were following the buchanan 7 SID with the rejoy transition. Visibility was good and the WX was not a factor. Shortly after departure, concord tower handed us off to travis departure. As I switched frequencys, I heard travis communicating with another aircraft. I waited till they finished and made my initial call. There was no acknowledgement and no communication from travis. At this time the captain began the turn outbound on the 071 degree radial of ccr climbing through 1800 ft. I contacted travis again after noticing travis was completely silent. Again there was no reply. Immediately after, I saw a piper at about 2 O'clock position flying perpendicular to our course and higher. After a couple of seconds, I realized if things continued we were going to hit this aircraft. I immediately notified the captain after realizing this. The captain took evasive action, which included a diving left turn. As he did this, the piper began a slow turn toward us coming very close to a collision. Almost immediately, travis asked us if we were on the frequency, which I replied affirmatively, and told him of the near miss. He made no comment. In hindsight, I realized my vision of the aircraft was blocked by the window post until the aircraft was very close. By this time the closure rates of the aircraft were significant. It is important to realize the visual limitations of your aircraft, including the citation ii, which has excellent visibility. Contributing was travis's delay in establishing radar contact. It did not appear that travis was busy based on the volume of radio traffic before and after the incident.

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Original NASA ASRS Text

Title: NMAC BTWN A CESSNA CITATION 11 C550 CLBING ON A SID DEP 3 MI FROM ARPT OF DEP AND A PIPER CHEROKEE PA28 COMING ACROSS THE C550 FLT PATH AT NEAR TO THE SAME ALT. THE CITATION CAPT TOOK EVASIVE ACTION BY DSNDING AND TURNING.

Narrative: OUR ACFT WAS CLBING TO OUR INITIAL ASSIGNED ALT IN OUR IFR CLRNC OF 4000 FT MSL. WE WERE FOLLOWING THE BUCHANAN 7 SID WITH THE REJOY TRANSITION. VISIBILITY WAS GOOD AND THE WX WAS NOT A FACTOR. SHORTLY AFTER DEP, CONCORD TWR HANDED US OFF TO TRAVIS DEP. AS I SWITCHED FREQS, I HEARD TRAVIS COMMUNICATING WITH ANOTHER ACFT. I WAITED TILL THEY FINISHED AND MADE MY INITIAL CALL. THERE WAS NO ACKNOWLEDGEMENT AND NO COM FROM TRAVIS. AT THIS TIME THE CAPT BEGAN THE TURN OUTBOUND ON THE 071 DEG RADIAL OF CCR CLBING THROUGH 1800 FT. I CONTACTED TRAVIS AGAIN AFTER NOTICING TRAVIS WAS COMPLETELY SILENT. AGAIN THERE WAS NO REPLY. IMMEDIATELY AFTER, I SAW A PIPER AT ABOUT 2 O'CLOCK POS FLYING PERPENDICULAR TO OUR COURSE AND HIGHER. AFTER A COUPLE OF SECONDS, I REALIZED IF THINGS CONTINUED WE WERE GOING TO HIT THIS ACFT. I IMMEDIATELY NOTIFIED THE CAPT AFTER REALIZING THIS. THE CAPT TOOK EVASIVE ACTION, WHICH INCLUDED A DIVING L TURN. AS HE DID THIS, THE PIPER BEGAN A SLOW TURN TOWARD US COMING VERY CLOSE TO A COLLISION. ALMOST IMMEDIATELY, TRAVIS ASKED US IF WE WERE ON THE FREQ, WHICH I REPLIED AFFIRMATIVELY, AND TOLD HIM OF THE NEAR MISS. HE MADE NO COMMENT. IN HINDSIGHT, I REALIZED MY VISION OF THE ACFT WAS BLOCKED BY THE WINDOW POST UNTIL THE ACFT WAS VERY CLOSE. BY THIS TIME THE CLOSURE RATES OF THE ACFT WERE SIGNIFICANT. IT IS IMPORTANT TO REALIZE THE VISUAL LIMITATIONS OF YOUR ACFT, INCLUDING THE CITATION II, WHICH HAS EXCELLENT VISIBILITY. CONTRIBUTING WAS TRAVIS'S DELAY IN ESTABLISHING RADAR CONTACT. IT DID NOT APPEAR THAT TRAVIS WAS BUSY BASED ON THE VOLUME OF RADIO TFC BEFORE AND AFTER THE INCIDENT.

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.