Narrative:

During a surprise swarm of convective storms in las; we found ourselves holding at kaddy intersection on the tyson 3 arrival. Forecast was for scattered showers but did not require; nor did we get; an alternate. As a strong storm was approaching the west end of las; captain decided to continue to las as dispatch was issuing a diversion to ont. At the exact moment of the dispatch message; approach instructed us to make a heading to intercept runway 25L localizer; and leave the hold. As we approached airport; airspeed would not reduce to final target speed. PF selected vref; but no change occurred. He disengaged and reengaged the auto thrust with no change. Aircraft seemed to want to stay at 10-15 kts above ref speed. It never fluctuated; but stayed stable. At 500 AGL callout; speed was not on target; but aircraft was stable. Landing occurred without incident. I must mention ground speed mini never was a factor as wind was steady and low in velocity. Neither reactive nor predictive wind shear systems activated. We were so busy with WX avoidance and continuing on the approach that an actual cause could not be determined. Our attention was diverted so troubleshooting was not a priority. As we approached las; the concern of whether we could continue holding or divert was causing anxiety. We felt we had few options but to land las in decent weather; but that was deteriorating rapidly. On our next leg during landing in calm winds and clear skies the same 'target speed' error occurred with me as PF. Upon landing; we entered a discrepancy in the logbook to have the auto thrust system checked.

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Original NASA ASRS Text

Title: A319 Flight Crew describes approaching LAS to find strong winds and unforecast weather with no planned alternate. During approach Autothrust does not manage speed as expected; maintaining 10-15 knots fast throughout. Heavy rain commenced shortly after landing. The Autothrust problem reappeared during approach on the next leg.

Narrative: During a surprise swarm of convective storms in LAS; we found ourselves holding at KADDY intersection on the Tyson 3 arrival. Forecast was for scattered showers but did not require; nor did we get; an alternate. As a strong storm was approaching the west end of LAS; Captain decided to continue to LAS as Dispatch was issuing a diversion to ONT. At the exact moment of the Dispatch message; approach instructed us to make a heading to intercept RWY 25L LOC; and leave the hold. As we approached airport; airspeed would not reduce to final target speed. PF selected Vref; but no change occurred. He disengaged and reengaged the Auto thrust with no change. Aircraft seemed to want to stay at 10-15 kts above ref speed. It never fluctuated; but stayed stable. At 500 AGL callout; speed was not on target; but aircraft was stable. Landing occurred without incident. I must mention ground speed mini never was a factor as wind was steady and low in velocity. Neither Reactive nor Predictive Wind Shear systems activated. We were so busy with WX avoidance and continuing on the approach that an actual cause could not be determined. Our attention was diverted so troubleshooting was not a priority. As we approached LAS; the concern of whether we could continue holding or divert was causing anxiety. We felt we had few options but to land LAS in decent weather; but that was deteriorating rapidly. On our next leg during landing in calm winds and clear skies the same 'target speed' error occurred with me as PF. Upon landing; we entered a discrepancy in the Logbook to have the Auto Thrust system checked.

Data retrieved from NASA's ASRS site as of April 2012 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.