Narrative:

ATC assigned a final cruise altitude of FL190. I changed the cruise altitude in the FMGC to FL190. Shortly thereafter; ATC instructed us to 'descend via the korry 3' STAR. I selected 10;000 in the altitude window of the MCP and selected managed descent in order to descend in compliance with the altitude restrictions on the STAR. I failed to realize that the airplane started a descent immediately instead of waiting to begin the descent out of FL190 at the skipy intersection; as mandated on the STAR. ATC advised of our error and we leveled off at 17;000 MSL until back on the vertical profile of the STAR. Fatigue and complacency contributed to a failure to monitor what the airplane was doing versus the requirements of the procedure. Pay closer attention by verifying the vertical and lateral requirements of the STAR procedure whenever departing an altitude on the STAR.

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Original NASA ASRS Text

Title: A319 First Officer reports engaging managed descent to comply with the KORRY 3 arrival with the aircraft cruising at FL190. This results in a descent below the crossing restriction of FL190 at SKIPY which is noted by ATC.

Narrative: ATC assigned a final cruise altitude of FL190. I changed the cruise altitude in the FMGC to FL190. Shortly thereafter; ATC instructed us to 'Descend VIA the Korry 3' STAR. I selected 10;000 in the altitude window of the MCP and selected Managed Descent in order to descend in compliance with the altitude restrictions on the STAR. I failed to realize that the airplane started a descent immediately instead of waiting to begin the descent out of FL190 at the SKIPY Intersection; as mandated on the STAR. ATC advised of our error and we leveled off at 17;000 MSL until back on the vertical profile of the STAR. Fatigue and complacency contributed to a failure to monitor what the airplane was doing versus the requirements of the procedure. Pay closer attention by verifying the vertical and lateral requirements of the STAR procedure whenever departing an altitude on the STAR.

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.