Narrative:

When cleared for takeoff at las, the tower controller said 'report departing aircraft ahead in sight and cleared for takeoff. We climbed faster than the aircraft ahead, and was higher, when at 6700 ft we received a TA followed by a RA. I looked at the aircraft ahead, because I initially thought it was the reason. Then I looked at the FMS and saw a red square with +17 slightly to our left. I looked at our altitude and cautioned the captain to watch our altitude, because it showed 7100 ft and climbing slowly. For what I think was his concern for passenger comfort, he allowed the altitude to get to 7200 ft before returning to our assigned altitude of 7000 ft. The aircraft passed over us at no less than 1500 ft above us. I didn't tell the controller we had a RA, even though the captain said to me 'we had a RA' when the controller cleared us to climb and turn right to another heading, then asked us to confirm on altitude, which was 7400 ft. She stated you climbed 200 ft high and asked us to copy a phone number, then cleared us to another frequency. I made a mistake in not stating immediately that we had a RA. Next time, I will do so immediately. Supplemental information from acn 577985: a gulfstream corporate aircraft was cleared for takeoff 20 seconds prior on the same runway. After takeoff and climbing through 6300 ft, a RA advised instructed us to increase vertical speed. After seeing the gulfstream that caused the RA, we immediately leveled off at 7200 ft, and then immediately descended to 7000 ft. This altitude deviation did, however, set off another TCASII RA on an aircraft overhead that was on right downwind for runway 9R at las. We failed to notify ATC of the RA until later.

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Original NASA ASRS Text

Title: PROVIDING VISUAL SEPARATION FROM A PREVIOUSLY DEPING GULF, C560XL FLT CREW INITIATED TCASII RA MANEUVER DUE TO AN OVERTAKE, THEN RECEIVED ANOTHER TCASII ALERT DUE TO OVERHEAD XING TFC AS THEY SLOWLY DSNDED BACK TO ASSIGNED ALT WHEN DEPING KLAS.

Narrative: WHEN CLRED FOR TKOF AT LAS, THE TWR CTLR SAID 'RPT DEPARTING ACFT AHEAD IN SIGHT AND CLRED FOR TKOF. WE CLBED FASTER THAN THE ACFT AHEAD, AND WAS HIGHER, WHEN AT 6700 FT WE RECEIVED A TA FOLLOWED BY A RA. I LOOKED AT THE ACFT AHEAD, BECAUSE I INITIALLY THOUGHT IT WAS THE REASON. THEN I LOOKED AT THE FMS AND SAW A RED SQUARE WITH +17 SLIGHTLY TO OUR L. I LOOKED AT OUR ALT AND CAUTIONED THE CAPT TO WATCH OUR ALT, BECAUSE IT SHOWED 7100 FT AND CLBING SLOWLY. FOR WHAT I THINK WAS HIS CONCERN FOR PAX COMFORT, HE ALLOWED THE ALT TO GET TO 7200 FT BEFORE RETURNING TO OUR ASSIGNED ALT OF 7000 FT. THE ACFT PASSED OVER US AT NO LESS THAN 1500 FT ABOVE US. I DIDN'T TELL THE CTLR WE HAD A RA, EVEN THOUGH THE CAPT SAID TO ME 'WE HAD A RA' WHEN THE CTLR CLRED US TO CLB AND TURN R TO ANOTHER HDG, THEN ASKED US TO CONFIRM ON ALT, WHICH WAS 7400 FT. SHE STATED YOU CLBED 200 FT HIGH AND ASKED US TO COPY A PHONE NUMBER, THEN CLRED US TO ANOTHER FREQ. I MADE A MISTAKE IN NOT STATING IMMEDIATELY THAT WE HAD A RA. NEXT TIME, I WILL DO SO IMMEDIATELY. SUPPLEMENTAL INFO FROM ACN 577985: A GULFSTREAM CORPORATE ACFT WAS CLRED FOR TKOF 20 SECONDS PRIOR ON THE SAME RWY. AFTER TKOF AND CLBING THROUGH 6300 FT, A RA ADVISED INSTRUCTED US TO INCREASE VERT SPD. AFTER SEEING THE GULFSTREAM THAT CAUSED THE RA, WE IMMEDIATELY LEVELED OFF AT 7200 FT, AND THEN IMMEDIATELY DSNDED TO 7000 FT. THIS ALT DEV DID, HOWEVER, SET OFF ANOTHER TCASII RA ON AN ACFT OVERHEAD THAT WAS ON R DOWNWIND FOR RWY 9R AT LAS. WE FAILED TO NOTIFY ATC OF THE RA UNTIL LATER.

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.