Narrative:

Our clearance from ord was the ord 1 departure. We depicted the 5 and 8 DME rings on our FMS to help us with the crossing restrs. We were then cleared. The first officer took off from runway 32R with a right turn to 020 degrees. Shortly after rolling out on our assigned heading we received a TA with only a yellow DOT on our TCASII display, meaning no altitude information. At this time, all 3 pilots looked outside for the traffic. In doing so, our climb was inadvertently slowed and we briefly ignored our altitude minimum for the 5 DME position. Departure asked if we informed anyone that we were unable to meet the crossing restr. I answered, 'no.' he said we missed our altitude restr by 500 ft. Our data indicated that we were 200 ft below the 3000 ft restr. Nonetheless we were below the required altitude. I will be sure in the future that the PF will concentrate solely on flying the aircraft and complying with all restrs. Supplemental information from acn 467189: the distraction of the TCASII event had drawn my attention from the SID. Also I was complacent due to never having a problem making the restr on the B777 during the winter months. Supplemental information from acn 467191: our weight was such that we could have complied with the requirement absent unusual circumstances, but without much margin for error. The traffic alert was the immediate distraction, but with hindsight we should have requested relief from the altitude restr, because of the greater flexibility and margin for error it would have allowed in this situation.

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Original NASA ASRS Text

Title: B777 CREW MISSES SID ALT RESTRS WHEN DISTRACTED BY A TCASII TA.

Narrative: OUR CLRNC FROM ORD WAS THE ORD 1 DEP. WE DEPICTED THE 5 AND 8 DME RINGS ON OUR FMS TO HELP US WITH THE XING RESTRS. WE WERE THEN CLRED. THE FO TOOK OFF FROM RWY 32R WITH A R TURN TO 020 DEGS. SHORTLY AFTER ROLLING OUT ON OUR ASSIGNED HEADING WE RECEIVED A TA WITH ONLY A YELLOW DOT ON OUR TCASII DISPLAY, MEANING NO ALT INFO. AT THIS TIME, ALL 3 PLTS LOOKED OUTSIDE FOR THE TFC. IN DOING SO, OUR CLB WAS INADVERTENTLY SLOWED AND WE BRIEFLY IGNORED OUR ALT MINIMUM FOR THE 5 DME POS. DEP ASKED IF WE INFORMED ANYONE THAT WE WERE UNABLE TO MEET THE XING RESTR. I ANSWERED, 'NO.' HE SAID WE MISSED OUR ALT RESTR BY 500 FT. OUR DATA INDICATED THAT WE WERE 200 FT BELOW THE 3000 FT RESTR. NONETHELESS WE WERE BELOW THE REQUIRED ALT. I WILL BE SURE IN THE FUTURE THAT THE PF WILL CONCENTRATE SOLELY ON FLYING THE ACFT AND COMPLYING WITH ALL RESTRS. SUPPLEMENTAL INFO FROM ACN 467189: THE DISTR OF THE TCASII EVENT HAD DRAWN MY ATTN FROM THE SID. ALSO I WAS COMPLACENT DUE TO NEVER HAVING A PROB MAKING THE RESTR ON THE B777 DURING THE WINTER MONTHS. SUPPLEMENTAL INFO FROM ACN 467191: OUR WT WAS SUCH THAT WE COULD HAVE COMPLIED WITH THE REQUIREMENT ABSENT UNUSUAL CIRCUMSTANCES, BUT WITHOUT MUCH MARGIN FOR ERROR. THE TFC ALERT WAS THE IMMEDIATE DISTR, BUT WITH HINDSIGHT WE SHOULD HAVE REQUESTED RELIEF FROM THE ALT RESTR, BECAUSE OF THE GREATER FLEXIBILITY AND MARGIN FOR ERROR IT WOULD HAVE ALLOWED IN THIS SIT.

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.