Narrative:

We were at FL290 about 40 mi southwest of ott VOR on the gve transition of the dupont 3 arrival. ZDC instructed us to cross ott at FL240. The first officer, who was flying, told me the point at which he would start his descent. The point was before the FMS computed descent point, but beyond where I would have started. I was not concerned, however, because I knew the F100 could descend at a high rate, should we get behind on the descent. The first officer initiated the descent by selecting a vertical speed in profile mode. Icing conditions and a cabin altitude control channel multi function display unit message caused some distraction and our descent seemed to shallow out. I reminded the first officer of our required descent rate, and he selected a different vertical mode for the autoplt. Approaching ott, we were still on path to make the crossing restr, but just barely. However, I did not anticipate the decreased vertical speed the autoplt used as we approached FL240. We crossed ott at FL243 and continued down to FL240. ZDC did not query us on our descent or crossing. I could have prevented this incident by suggesting an earlier descent point to the first officer. Padding the required distance would account for unexpected conditions during the descent. I also will not assume the F100's high descent capability will always be available.

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Original NASA ASRS Text

Title: DUE TO FMS PROGRAMMING, WX FACTORS (ICING), AND MULTI FUNCTION DISPLAY UNIT DISTR, ALT XING RESTR NOT MET.

Narrative: WE WERE AT FL290 ABOUT 40 MI SW OF OTT VOR ON THE GVE TRANSITION OF THE DUPONT 3 ARR. ZDC INSTRUCTED US TO CROSS OTT AT FL240. THE FO, WHO WAS FLYING, TOLD ME THE POINT AT WHICH HE WOULD START HIS DSCNT. THE POINT WAS BEFORE THE FMS COMPUTED DSCNT POINT, BUT BEYOND WHERE I WOULD HAVE STARTED. I WAS NOT CONCERNED, HOWEVER, BECAUSE I KNEW THE F100 COULD DSND AT A HIGH RATE, SHOULD WE GET BEHIND ON THE DSCNT. THE FO INITIATED THE DSCNT BY SELECTING A VERT SPD IN PROFILE MODE. ICING CONDITIONS AND A CABIN ALT CTL CHANNEL MULTI FUNCTION DISPLAY UNIT MESSAGE CAUSED SOME DISTR AND OUR DSCNT SEEMED TO SHALLOW OUT. I REMINDED THE FO OF OUR REQUIRED DSCNT RATE, AND HE SELECTED A DIFFERENT VERT MODE FOR THE AUTOPLT. APCHING OTT, WE WERE STILL ON PATH TO MAKE THE XING RESTR, BUT JUST BARELY. HOWEVER, I DID NOT ANTICIPATE THE DECREASED VERT SPD THE AUTOPLT USED AS WE APCHED FL240. WE CROSSED OTT AT FL243 AND CONTINUED DOWN TO FL240. ZDC DID NOT QUERY US ON OUR DSCNT OR XING. I COULD HAVE PREVENTED THIS INCIDENT BY SUGGESTING AN EARLIER DSCNT POINT TO THE FO. PADDING THE REQUIRED DISTANCE WOULD ACCOUNT FOR UNEXPECTED CONDITIONS DURING THE DSCNT. I ALSO WILL NOT ASSUME THE F100'S HIGH DSCNT CAPABILITY WILL ALWAYS BE AVAILABLE.

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.