Narrative:

All preflight and takeoff activities were normal until we were airborne approximately 1500 ft AGL when the onboard TCASII activated an RA to 'monitor vertical speed' and indicated traffic 600 ft below us. At this time we were IMC and unable to confirm traffic visually. The suddenness of the traffic warning and lack of visibility was a little unnerving. I immediately contacted ATC to verify with and inform the controller of our RA. At this same time we were encountering icing conditions and being caught up in the wake turbulence of an large transport some 5 mi ahead. When we climbed through approximately 8000 ft we broke out of the clouds to a brilliant afternoon sun directly in our face. Going through 8000 ft the first officer made preparations on the flight guidance system to accelerate the aircraft to 320 KTS once we leveled at 10000 ft. At this time he noted that the altitude arming window was set for 12000 ft. With all the activity that had taken place since takeoff, he thought that he had missed new climb instructions to 12000 ft. I was on the ATC radio at this time receiving and reading back turn instructions, so he was unable to confirm the altitude clearance with me. I was also checking our TCASII equipment to see if it was working properly. As we approach 10900 ft, the departure controller inquired on our altitude and stated we were only cleared to 10000 ft. We began a level off and descent with our altitude peaking at 11000 ft. The controller quickly told us to remain at our altitude and subsequently cleared us to 14000 ft.

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Original NASA ASRS Text

Title: ACFT HAS UNCONFIRMED TCASII RA AT 1500 FT AND LATER OVERSHOT ASSIGNED ALT BY 1000 FT.

Narrative: ALL PREFLT AND TKOF ACTIVITIES WERE NORMAL UNTIL WE WERE AIRBORNE APPROX 1500 FT AGL WHEN THE ONBOARD TCASII ACTIVATED AN RA TO 'MONITOR VERT SPD' AND INDICATED TFC 600 FT BELOW US. AT THIS TIME WE WERE IMC AND UNABLE TO CONFIRM TFC VISUALLY. THE SUDDENNESS OF THE TFC WARNING AND LACK OF VISIBILITY WAS A LITTLE UNNERVING. I IMMEDIATELY CONTACTED ATC TO VERIFY WITH AND INFORM THE CTLR OF OUR RA. AT THIS SAME TIME WE WERE ENCOUNTERING ICING CONDITIONS AND BEING CAUGHT UP IN THE WAKE TURB OF AN LGT SOME 5 MI AHEAD. WHEN WE CLBED THROUGH APPROX 8000 FT WE BROKE OUT OF THE CLOUDS TO A BRILLIANT AFTERNOON SUN DIRECTLY IN OUR FACE. GOING THROUGH 8000 FT THE FO MADE PREPARATIONS ON THE FLT GUIDANCE SYS TO ACCELERATE THE ACFT TO 320 KTS ONCE WE LEVELED AT 10000 FT. AT THIS TIME HE NOTED THAT THE ALT ARMING WINDOW WAS SET FOR 12000 FT. WITH ALL THE ACTIVITY THAT HAD TAKEN PLACE SINCE TKOF, HE THOUGHT THAT HE HAD MISSED NEW CLB INSTRUCTIONS TO 12000 FT. I WAS ON THE ATC RADIO AT THIS TIME RECEIVING AND READING BACK TURN INSTRUCTIONS, SO HE WAS UNABLE TO CONFIRM THE ALT CLRNC WITH ME. I WAS ALSO CHKING OUR TCASII EQUIP TO SEE IF IT WAS WORKING PROPERLY. AS WE APCH 10900 FT, THE DEP CTLR INQUIRED ON OUR ALT AND STATED WE WERE ONLY CLRED TO 10000 FT. WE BEGAN A LEVEL OFF AND DSCNT WITH OUR ALT PEAKING AT 11000 FT. THE CTLR QUICKLY TOLD US TO REMAIN AT OUR ALT AND SUBSEQUENTLY CLRED US TO 14000 FT.

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.