Narrative:

Air carrier X cleared into position on runway 29L at msp on tower frequency 126.7. We were told there would be a delay in position due to cross over traffic. An large transport departed 29L ahead of us. We were cleared for takeoff on runway 29L. Runway heading to 5000 ft. First officer was flying the aircraft. Takeoff was normal, reduced thrust was used. As we rotated an medium large transport came into my sight departing runway 29R. The medium large transport was on another tower frequency. Initially the medium large transport appeared to be on a runway heading but I then noticed the start of a left turn across our path. The medium large transport was higher than us but was not climbing as quickly. I told the tower controller of the medium large transport traffic and by this time first officer saw the traffic and leveled our aircraft off to pass under the medium large transport. I don't believe the medium large transport saw us. He did not appear to take any evasive action. Upon realizing the conflict the tower controller issued us an immediate left turn to 230 degree and a few seconds later a right turn to 280 degree. We complied with both commands. We lost sight of the medium large transport as it passed over us from right to left. We passed directly beneath the medium large transport by approximately 200-300 ft. This large transport aircraft was not equipped with TCASII. We continued our climb to 5000 ft after the medium large transport was in sight south of our position. Our problem may have been caused by lack of communication between 2 tower controllers on separate frequencys. To prevent this from occurring aircraft should not be given turns after departure from a runway that cause them to cross another active runway centerline unless both runway departures are talking to the same tower controller. Pilot evasive action provided vertical separation. ATC turn commands provided no separation.

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Original NASA ASRS Text

Title: ACR X HAD NMAC AND LTSS FROM MLG DEPARTING MULTIPLE RWY OP PARALLEL RWYS. SYS ERROR.

Narrative: ACR X CLRED INTO POS ON RWY 29L AT MSP ON TWR FREQ 126.7. WE WERE TOLD THERE WOULD BE A DELAY IN POS DUE TO CROSS OVER TFC. AN LGT DEPARTED 29L AHEAD OF US. WE WERE CLRED FOR TKOF ON RWY 29L. RWY HDG TO 5000 FT. FO WAS FLYING THE ACFT. TKOF WAS NORMAL, REDUCED THRUST WAS USED. AS WE ROTATED AN MLG CAME INTO MY SIGHT DEPARTING RWY 29R. THE MLG WAS ON ANOTHER TWR FREQ. INITIALLY THE MLG APPEARED TO BE ON A RWY HDG BUT I THEN NOTICED THE START OF A L TURN ACROSS OUR PATH. THE MLG WAS HIGHER THAN US BUT WAS NOT CLBING AS QUICKLY. I TOLD THE TWR CTLR OF THE MLG TFC AND BY THIS TIME FO SAW THE TFC AND LEVELED OUR ACFT OFF TO PASS UNDER THE MLG. I DON'T BELIEVE THE MLG SAW US. HE DID NOT APPEAR TO TAKE ANY EVASIVE ACTION. UPON REALIZING THE CONFLICT THE TWR CTLR ISSUED US AN IMMEDIATE L TURN TO 230 DEG AND A FEW SECONDS LATER A R TURN TO 280 DEG. WE COMPLIED WITH BOTH COMMANDS. WE LOST SIGHT OF THE MLG AS IT PASSED OVER US FROM R TO L. WE PASSED DIRECTLY BENEATH THE MLG BY APPROX 200-300 FT. THIS LGT ACFT WAS NOT EQUIPPED WITH TCASII. WE CONTINUED OUR CLB TO 5000 FT AFTER THE MLG WAS IN SIGHT S OF OUR POS. OUR PROBLEM MAY HAVE BEEN CAUSED BY LACK OF COM BTWN 2 TWR CTLRS ON SEPARATE FREQS. TO PREVENT THIS FROM OCCURRING ACFT SHOULD NOT BE GIVEN TURNS AFTER DEP FROM A RWY THAT CAUSE THEM TO CROSS ANOTHER ACTIVE RWY CTRLINE UNLESS BOTH RWY DEPS ARE TALKING TO THE SAME TWR CTLR. PLT EVASIVE ACTION PROVIDED VERT SEPARATION. ATC TURN COMMANDS PROVIDED NO 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.