Narrative:

Just after takeoff sfo runway 01R and just after raising gear using full thrust takeoff in medium large transport aircraft, I looked up from raising gear (first officer was flying aircraft) to see a high wing twin commuter type aircraft in a slight right bank at 11 O'clock and about 50 yds. We were overtaking at 30-50 KTS. The right/O had just started his turn at a bank angle of approximately 5 degrees to 030 degrees as per the sfo 3 departure. I grabbed the controls and applied a great deal of aileron and raised the nose to avoid hitting the aircraft. Sfo tower was speaking to the aircraft in an agitated manner for not following his heading instructions after takeoff. That aircraft then started a left bank and the bank angle we were in to the right avoided collision. Our airspeed was between 160 and 180 KTS, and believe me, the aircraft is very slow responding to a great of deal of aileron input. Our F/a's noticed nothing unusual in the manner of our avoidance maneuver nor did apparently our passenger. The bank angle of our aircraft was such that it would have been hard to see the other aircraft and the first officer did not see him until he was into his left bank, below us and at approximately 200' going away. Had evasive action not been taken, we would have struck the other aircraft. No tower communications were received by us concerning the other aircraft, to the best of my or the first officer's knowledge. However, the occurrence was quite unsettling for us both and our concentration was fully on missing the other aircraft. We do remember being switched to departure control frequency. ATIS 'U' was in effect 17 10 60 degrees wind 270 degrees/14 30.14, but observed WX was clear and 30+ visibility. As far as I am aware, we followed our clearance exactly. I suspect the commuter was turning to 030 degrees per the SID and may have received departure instructions different than the departure SID. I have filed a statement with my airline and they are investigating with the ATC for exactly what occurred.

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Original NASA ASRS Text

Title: NMAC BETWEEN 2 DEPARTING ACFT.

Narrative: JUST AFTER TKOF SFO RWY 01R AND JUST AFTER RAISING GEAR USING FULL THRUST TKOF IN MLG ACFT, I LOOKED UP FROM RAISING GEAR (F/O WAS FLYING ACFT) TO SEE A HIGH WING TWIN COMMUTER TYPE ACFT IN A SLIGHT RIGHT BANK AT 11 O'CLOCK AND ABOUT 50 YDS. WE WERE OVERTAKING AT 30-50 KTS. THE R/O HAD JUST STARTED HIS TURN AT A BANK ANGLE OF APPROX 5 DEGS TO 030 DEGS AS PER THE SFO 3 DEP. I GRABBED THE CONTROLS AND APPLIED A GREAT DEAL OF AILERON AND RAISED THE NOSE TO AVOID HITTING THE ACFT. SFO TWR WAS SPEAKING TO THE ACFT IN AN AGITATED MANNER FOR NOT FOLLOWING HIS HDG INSTRUCTIONS AFTER TKOF. THAT ACFT THEN STARTED A LEFT BANK AND THE BANK ANGLE WE WERE IN TO THE RIGHT AVOIDED COLLISION. OUR AIRSPD WAS BTWN 160 AND 180 KTS, AND BELIEVE ME, THE ACFT IS VERY SLOW RESPONDING TO A GREAT OF DEAL OF AILERON INPUT. OUR F/A'S NOTICED NOTHING UNUSUAL IN THE MANNER OF OUR AVOIDANCE MANEUVER NOR DID APPARENTLY OUR PAX. THE BANK ANGLE OF OUR ACFT WAS SUCH THAT IT WOULD HAVE BEEN HARD TO SEE THE OTHER ACFT AND THE F/O DID NOT SEE HIM UNTIL HE WAS INTO HIS LEFT BANK, BELOW US AND AT APPROX 200' GOING AWAY. HAD EVASIVE ACTION NOT BEEN TAKEN, WE WOULD HAVE STRUCK THE OTHER ACFT. NO TWR COMS WERE RECEIVED BY US CONCERNING THE OTHER ACFT, TO THE BEST OF MY OR THE F/O'S KNOWLEDGE. HOWEVER, THE OCCURRENCE WAS QUITE UNSETTLING FOR US BOTH AND OUR CONCENTRATION WAS FULLY ON MISSING THE OTHER ACFT. WE DO REMEMBER BEING SWITCHED TO DEP CTL FREQ. ATIS 'U' WAS IN EFFECT 17 10 60 DEGS WIND 270 DEGS/14 30.14, BUT OBSERVED WX WAS CLEAR AND 30+ VISIBILITY. AS FAR AS I AM AWARE, WE FOLLOWED OUR CLRNC EXACTLY. I SUSPECT THE COMMUTER WAS TURNING TO 030 DEGS PER THE SID AND MAY HAVE RECEIVED DEP INSTRUCTIONS DIFFERENT THAN THE DEP SID. I HAVE FILED A STATEMENT WITH MY AIRLINE AND THEY ARE INVESTIGATING WITH THE ATC FOR EXACTLY WHAT OCCURRED.

Data retrieved from NASA's ASRS site as of August 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.