Narrative:

Sector a gave altitude crossing restr of FL240 25 mi west of ctw. I programmed FMC for this restr. We were then handed off to sector B who revised restr to FL190 10 mi west of ctw. I reprogrammed FMC for new restr and selected the capture function on the descent page of FMC. Aircraft began a 1000 FPM descent and I watched the mileage countdown on descent page to meet restr. When mileage countdown hit '0,' the aircraft did not pull throttle to idle and begin high rate of descent. I then went back to route legs page and saw I had 7 mi to restr point and approximately 6000 ft to lose. I immediately extended speed brakes and increased descent rate to 5500 FPM which put me at maximum operating speed. I missed restr by 1000-1500 ft. No comment from center. Captain and I reviewed our programming of FMC but found no errors in what we did. I did learn I need to go back to raw data to xchk automation.

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Original NASA ASRS Text

Title: THE FLC OF A B737-300 UNDERSHOT ASSIGNED XING RESTR ON A STAR ARR DUE TO THE FMC DID NOT PERFORM AS THEY BELIEVED IT WAS SET.

Narrative: SECTOR A GAVE ALT XING RESTR OF FL240 25 MI W OF CTW. I PROGRAMMED FMC FOR THIS RESTR. WE WERE THEN HANDED OFF TO SECTOR B WHO REVISED RESTR TO FL190 10 MI W OF CTW. I REPROGRAMMED FMC FOR NEW RESTR AND SELECTED THE CAPTURE FUNCTION ON THE DSCNT PAGE OF FMC. ACFT BEGAN A 1000 FPM DSCNT AND I WATCHED THE MILEAGE COUNTDOWN ON DSCNT PAGE TO MEET RESTR. WHEN MILEAGE COUNTDOWN HIT '0,' THE ACFT DID NOT PULL THROTTLE TO IDLE AND BEGIN HIGH RATE OF DSCNT. I THEN WENT BACK TO RTE LEGS PAGE AND SAW I HAD 7 MI TO RESTR POINT AND APPROX 6000 FT TO LOSE. I IMMEDIATELY EXTENDED SPD BRAKES AND INCREASED DSCNT RATE TO 5500 FPM WHICH PUT ME AT MAX OPERATING SPD. I MISSED RESTR BY 1000-1500 FT. NO COMMENT FROM CTR. CAPT AND I REVIEWED OUR PROGRAMMING OF FMC BUT FOUND NO ERRORS IN WHAT WE DID. I DID LEARN I NEED TO GO BACK TO RAW DATA TO XCHK AUTOMATION.

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.