Narrative:

I am not certain if this situation is an abnormal occurrence since I am not familiar with ATC separation requirements on parallel runway operations. We were cleared for takeoff from bos runway 4L. No departure heading was assigned so runway heading was maintained per our logan 2 clearance. After the gear was raised, both the first officer and I noticed our TCASII was displaying proximity traffic at our altitude and our position. I began a visual search when the first officer said the traffic was on his side. I looked, and at our 3 O'clock position was a B767 climbing parallel to us. Tower had already handed us off to departure and they were talking to other traffic. So we were unable to immediately get a turn away. The B767 was as far from us as the distance between runways 4L&right at bos. I maintained my heading, he maintained his, until departure cleared us for a left turn (at approximately 2000 ft). Just as I said in the beginning of this report, I don't know if this was a problem. We had no warning about air carrier and it was unnerving seeing a plane that close without any warning from ATC. The rest of the flight continued without incident. I feel ATC should have either gave us a heading on departure, told us the other plane was going to be there, or staggered the departures so either one of us was ahead of the other. We were definitely distraction from our duties during a critical phase of flight.

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Original NASA ASRS Text

Title: RPTR STATES THAT NO ADVISORY WAS GIVEN ABOUT ACFT Y THAT DEPARTED ON THE PARALLEL RWY.

Narrative: I AM NOT CERTAIN IF THIS SIT IS AN ABNORMAL OCCURRENCE SINCE I AM NOT FAMILIAR WITH ATC SEPARATION REQUIREMENTS ON PARALLEL RWY OPS. WE WERE CLRED FOR TKOF FROM BOS RWY 4L. NO DEP HDG WAS ASSIGNED SO RWY HDG WAS MAINTAINED PER OUR LOGAN 2 CLRNC. AFTER THE GEAR WAS RAISED, BOTH THE FO AND I NOTICED OUR TCASII WAS DISPLAYING PROX TFC AT OUR ALT AND OUR POS. I BEGAN A VISUAL SEARCH WHEN THE FO SAID THE TFC WAS ON HIS SIDE. I LOOKED, AND AT OUR 3 O'CLOCK POS WAS A B767 CLBING PARALLEL TO US. TWR HAD ALREADY HANDED US OFF TO DEP AND THEY WERE TALKING TO OTHER TFC. SO WE WERE UNABLE TO IMMEDIATELY GET A TURN AWAY. THE B767 WAS AS FAR FROM US AS THE DISTANCE BTWN RWYS 4L&R AT BOS. I MAINTAINED MY HDG, HE MAINTAINED HIS, UNTIL DEP CLRED US FOR A L TURN (AT APPROX 2000 FT). JUST AS I SAID IN THE BEGINNING OF THIS RPT, I DON'T KNOW IF THIS WAS A PROB. WE HAD NO WARNING ABOUT ACR AND IT WAS UNNERVING SEEING A PLANE THAT CLOSE WITHOUT ANY WARNING FROM ATC. THE REST OF THE FLT CONTINUED WITHOUT INCIDENT. I FEEL ATC SHOULD HAVE EITHER GAVE US A HDG ON DEP, TOLD US THE OTHER PLANE WAS GOING TO BE THERE, OR STAGGERED THE DEPS SO EITHER ONE OF US WAS AHEAD OF THE OTHER. WE WERE DEFINITELY DISTR FROM OUR DUTIES DURING A CRITICAL PHASE OF FLT.

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.