Narrative:

We were cleared to maintain a heading (approximately 080 degrees) to intercept the tomsn 1 arrival for denver, and to cross tomsn intersection at FL190 and 250 KTS. I planned a high speed descent using a 2:1 formula (2 mi descent distance for each 1000 ft of altitude to lose). I assumed that our 45 degree intercept to the radial would give me about 10 extra mi to descend in addition to the DME readout, and we had a 30 KT tailwind. Still we 'ran short.' we were at FL190 by the crossing restr, but hadn't slowed to 250 KTS. I missed the speed by about 4 mi, but we were at about 350 KTS the entire descent, and 300 KTS (50 KTS too fast) crossing the intersection. ZDV asked us 'say speed' and I knew I had cut it way too close. 20/20 hindsight makes it obvious that a high speed descent to a point on an arrival with a speed restr gives both controller and pilot a distraction that neither needs. In the future, I will plan dscnts more conservatively when there is a crossing speed restr or a tailwind, especially when the distance 'off radial' is a guess/estimate.

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Original NASA ASRS Text

Title: AN ACR B727 FLC CROSSED TOMSN INTXN ABOVE THEIR ASSIGNED SPD RESTR. THE FLC WAS OPERATING WITHOUT AN FMS THAT COULD HAVE ASSISTED IN THEIR COMPUTATIONS FOR A DOG LEG TYPE OF INTERCEPT.

Narrative: WE WERE CLRED TO MAINTAIN A HDG (APPROX 080 DEGS) TO INTERCEPT THE TOMSN 1 ARR FOR DENVER, AND TO CROSS TOMSN INTXN AT FL190 AND 250 KTS. I PLANNED A HIGH SPD DSCNT USING A 2:1 FORMULA (2 MI DSCNT DISTANCE FOR EACH 1000 FT OF ALT TO LOSE). I ASSUMED THAT OUR 45 DEG INTERCEPT TO THE RADIAL WOULD GIVE ME ABOUT 10 EXTRA MI TO DSND IN ADDITION TO THE DME READOUT, AND WE HAD A 30 KT TAILWIND. STILL WE 'RAN SHORT.' WE WERE AT FL190 BY THE XING RESTR, BUT HADN'T SLOWED TO 250 KTS. I MISSED THE SPD BY ABOUT 4 MI, BUT WE WERE AT ABOUT 350 KTS THE ENTIRE DSCNT, AND 300 KTS (50 KTS TOO FAST) XING THE INTXN. ZDV ASKED US 'SAY SPD' AND I KNEW I HAD CUT IT WAY TOO CLOSE. 20/20 HINDSIGHT MAKES IT OBVIOUS THAT A HIGH SPD DSCNT TO A POINT ON AN ARR WITH A SPD RESTR GIVES BOTH CTLR AND PLT A DISTR THAT NEITHER NEEDS. IN THE FUTURE, I WILL PLAN DSCNTS MORE CONSERVATIVELY WHEN THERE IS A XING SPD RESTR OR A TAILWIND, ESPECIALLY WHEN THE DISTANCE 'OFF RADIAL' IS A GUESS/ESTIMATE.

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.