Narrative:

Taxiing for takeoff at las runway 25R. While on taxiway B passing A2 the first officer contacted the tower on 119.9 and we were cleared for takeoff runway 25R. Checklists were completed and the captain commenced takeoff roll approximately 2 mins after the takeoff clearance was received. The aircraft was rotated at approximately 165 KTS. The captain called for the gear to be raised. As the first officer reached for the gear handle he leaned forward slightly. Out of the first officer's clear view sliding window, I saw a B737 in a climb attitude at about the 1:30 O'clock position, relative to us, converging. We both crossed the intersection of runways 25R and 19 simultaneously. I estimated the B737 to be approximately 150 ft above. I could not tell exactly but believe the B737 passed over us or slightly behind. The incident was over before I could alert the other crew members. Neither the captain or first officer saw the B737. I called out 'wow, did you see that B737.' the first officer questioned what I had said, and I told him what I had seen. I then said look at the TCASII. The TCASII on the 10 mi range showed an amber with +2 virtually on top of our aircraft symbol. The captain called the tower. The tower said they were checking to see what had happened, and told the captain to contact departure. Departure called 'traffic at 7 O'clock position, do you have it in sight?' (I don't recall the distance.) we did not have the traffic. 3 mi west, the captain began a left turn as published on the SID. Departure again called out the traffic and issued us a heading of 210 degrees. We now had the traffic in sight at 9 O'clock position, paralleling our track approximately 3 mi. No further incident. The captain elected to have the voice recorder circuit breaker pulled to save the tape. We were later informed by our flight operations that the tower had cleared both aircraft for takeoff. Contributing factors: las has different tower frequencys for these intersecting runways: runway 25R -- 119.9 and runway 19 -- 118.75. Suggested corrective action: intersecting runways should always be on the same frequency.

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Original NASA ASRS Text

Title: NMAC BTWN A DC10-10 JUST LIFTED OFF ON AN INITIAL CLB, AND OVER AN INTERSECTING RWY, AND A B737-200, AT 150 FT ABOVE THE DC10 AND XING OVER THE TOP ON INITIAL CLB AFTER TKOF ON THE INTERSECTING RWY. EACH RWY WAS ON DIFFERENT CTL FREQ. TWR ADMITTED LATER THAT BOTH ACFT HAD BEEN CLRED FOR TKOF AND THAT IT WAS AN ATC OPERROR.

Narrative: TAXIING FOR TKOF AT LAS RWY 25R. WHILE ON TXWY B PASSING A2 THE FO CONTACTED THE TWR ON 119.9 AND WE WERE CLRED FOR TKOF RWY 25R. CHKLISTS WERE COMPLETED AND THE CAPT COMMENCED TKOF ROLL APPROX 2 MINS AFTER THE TKOF CLRNC WAS RECEIVED. THE ACFT WAS ROTATED AT APPROX 165 KTS. THE CAPT CALLED FOR THE GEAR TO BE RAISED. AS THE FO REACHED FOR THE GEAR HANDLE HE LEANED FORWARD SLIGHTLY. OUT OF THE FO'S CLR VIEW SLIDING WINDOW, I SAW A B737 IN A CLB ATTITUDE AT ABOUT THE 1:30 O'CLOCK POS, RELATIVE TO US, CONVERGING. WE BOTH CROSSED THE INTXN OF RWYS 25R AND 19 SIMULTANEOUSLY. I ESTIMATED THE B737 TO BE APPROX 150 FT ABOVE. I COULD NOT TELL EXACTLY BUT BELIEVE THE B737 PASSED OVER US OR SLIGHTLY BEHIND. THE INCIDENT WAS OVER BEFORE I COULD ALERT THE OTHER CREW MEMBERS. NEITHER THE CAPT OR FO SAW THE B737. I CALLED OUT 'WOW, DID YOU SEE THAT B737.' THE FO QUESTIONED WHAT I HAD SAID, AND I TOLD HIM WHAT I HAD SEEN. I THEN SAID LOOK AT THE TCASII. THE TCASII ON THE 10 MI RANGE SHOWED AN AMBER WITH +2 VIRTUALLY ON TOP OF OUR ACFT SYMBOL. THE CAPT CALLED THE TWR. THE TWR SAID THEY WERE CHKING TO SEE WHAT HAD HAPPENED, AND TOLD THE CAPT TO CONTACT DEP. DEP CALLED 'TFC AT 7 O'CLOCK POS, DO YOU HAVE IT IN SIGHT?' (I DON'T RECALL THE DISTANCE.) WE DID NOT HAVE THE TFC. 3 MI W, THE CAPT BEGAN A L TURN AS PUBLISHED ON THE SID. DEP AGAIN CALLED OUT THE TFC AND ISSUED US A HDG OF 210 DEGS. WE NOW HAD THE TFC IN SIGHT AT 9 O'CLOCK POS, PARALLELING OUR TRACK APPROX 3 MI. NO FURTHER INCIDENT. THE CAPT ELECTED TO HAVE THE VOICE RECORDER CIRCUIT BREAKER PULLED TO SAVE THE TAPE. WE WERE LATER INFORMED BY OUR FLT OPS THAT THE TWR HAD CLRED BOTH ACFT FOR TKOF. CONTRIBUTING FACTORS: LAS HAS DIFFERENT TWR FREQS FOR THESE INTERSECTING RWYS: RWY 25R -- 119.9 AND RWY 19 -- 118.75. SUGGESTED CORRECTIVE ACTION: INTERSECTING RWYS SHOULD ALWAYS BE ON THE SAME FREQ.

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.