Narrative:

Captain was PF. 46 passenger and 3 crew. Taxied to runway 22L at ord. ATIS information was current. Winds 270 degrees at 7 KTS, visibility 10 mi, clouds few at 2800 ft, 28 degrees dewpoint 22 degrees, altimeter setting 29.73. Arrival runway 14R, runway 22R and runway 22L. Departure runway 22L, runway 27L and runway 14L. We were cleared into position and hold on runway 22L (tower frequency 132.7). There were city vehicles on the runway, looking for FOD that had been reported by a previous aircraft. Once the vehicles were clear of the runway, we were cleared for takeoff and to turn to a heading of 180 degrees. My first officer repeated back the clearance. We accelerated down the runway and after V1, vr at liftoff we saw a B747 off our right side, taking off of runway 14R. Tower called the traffic at that time. We leveled off about 100 ft AGL with no zero G's. The B747 flew overhead about 200 ft above us. Once the B747 passed and we were clear, we continued the climb and followed the command bars on the eadi. The flight continued with no further problems and there were no injuries. I don't believe the B747 aircraft was on the same tower frequency as we were. I or my first officer did not hear a clearance for takeoff on runway 14R. We did not know they were departing runway 14R. An near midair collision report was filed with ord control tower. Supplemental information from acn 481921: we departed runway 14L on flight ord-hkg. We were near maximum gross weight (approximately 865000 pounds). We did not see anything, but upon return to ord 6 days later I was told that an ATR was taking off on runway 22L at the same time and had to level off at 100 ft to avoid us. This was the only information that was reported to us.

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Original NASA ASRS Text

Title: AN NMAC OF 200 FT VERT SEPARATION WAS RPTED BTWN A B747-400 ON LIFTOFF FROM RWY 14R AND AN ATR42 ON LIFTOFF FROM RWY 22L 100 FT AGL AT ORD, IL.

Narrative: CAPT WAS PF. 46 PAX AND 3 CREW. TAXIED TO RWY 22L AT ORD. ATIS INFO WAS CURRENT. WINDS 270 DEGS AT 7 KTS, VISIBILITY 10 MI, CLOUDS FEW AT 2800 FT, 28 DEGS DEWPOINT 22 DEGS, ALTIMETER SETTING 29.73. ARR RWY 14R, RWY 22R AND RWY 22L. DEP RWY 22L, RWY 27L AND RWY 14L. WE WERE CLRED INTO POS AND HOLD ON RWY 22L (TWR FREQ 132.7). THERE WERE CITY VEHICLES ON THE RWY, LOOKING FOR FOD THAT HAD BEEN RPTED BY A PREVIOUS ACFT. ONCE THE VEHICLES WERE CLR OF THE RWY, WE WERE CLRED FOR TKOF AND TO TURN TO A HDG OF 180 DEGS. MY FO REPEATED BACK THE CLRNC. WE ACCELERATED DOWN THE RWY AND AFTER V1, VR AT LIFTOFF WE SAW A B747 OFF OUR R SIDE, TAKING OFF OF RWY 14R. TWR CALLED THE TFC AT THAT TIME. WE LEVELED OFF ABOUT 100 FT AGL WITH NO ZERO G'S. THE B747 FLEW OVERHEAD ABOUT 200 FT ABOVE US. ONCE THE B747 PASSED AND WE WERE CLR, WE CONTINUED THE CLB AND FOLLOWED THE COMMAND BARS ON THE EADI. THE FLT CONTINUED WITH NO FURTHER PROBS AND THERE WERE NO INJURIES. I DON'T BELIEVE THE B747 ACFT WAS ON THE SAME TWR FREQ AS WE WERE. I OR MY FO DID NOT HEAR A CLRNC FOR TKOF ON RWY 14R. WE DID NOT KNOW THEY WERE DEPARTING RWY 14R. AN NMAC RPT WAS FILED WITH ORD CTL TWR. SUPPLEMENTAL INFO FROM ACN 481921: WE DEPARTED RWY 14L ON FLT ORD-HKG. WE WERE NEAR MAX GROSS WT (APPROX 865000 LBS). WE DID NOT SEE ANYTHING, BUT UPON RETURN TO ORD 6 DAYS LATER I WAS TOLD THAT AN ATR WAS TAKING OFF ON RWY 22L AT THE SAME TIME AND HAD TO LEVEL OFF AT 100 FT TO AVOID US. THIS WAS THE ONLY INFO THAT WAS RPTED TO US.

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.