Narrative:

I was the pilot flying (PF) we were cleared to descend via the kepec 3 arrival into las runway 25L. I set 8000 feet on the FCU which is the altitude to set for the arrival; I started the descent using managed descent with a thorough briefing and checking the nd and mcdu prior; with my first officer (first officer) backing me up. There was a crossing restriction to cross kepec at 13;000 feet. All of a sudden my first officer being the pilot monitoring (pm) alerted me to my altitude which at the time was 12;700 I was below 13;000 feet and immediately set 13;000 feet selected open climb to climb back up to the 13;000 feet. When I went below the 13;000 feet it was under 4 miles before kepec. At the time ATC asked as to verify our altitude; we then realized our altimeter setting was wrong. It was supposed to be 29.94 and we had set 30.10 from the departure airport. We told ATC about the wrong altimeter setting and apologized. They said it was okay. Always double check your arrival with the nd and mcdu let both pilots check the work; and monitor always. Even if it means taking over with other modes or even disconnect the autopilot if you have to; always slow down never rush monitor; monitor. Make sure your altimeter setting is correct.

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Original NASA ASRS Text

Title: A319 flight crew reports descending below the KEPEC crossing restriction on the KEPEC3 arrival to LAS. The aircraft was descending in managed descent but the FMGC apparently did not recognize the restrictions; displaying them in blue rather than magenta. An altimeter setting error was also involved.

Narrative: I was the Pilot Flying (PF) we were cleared to descend via the KEPEC 3 Arrival into LAS RWY 25L. I set 8000 feet on the FCU which is the altitude to set for the arrival; I started the descent using managed descent with a thorough briefing and checking the ND and MCDU prior; with my First Officer (FO) backing me up. There was a crossing restriction to cross KEPEC at 13;000 feet. All of a sudden my FO being the Pilot Monitoring (PM) alerted me to my altitude which at the time was 12;700 I was below 13;000 feet and immediately set 13;000 feet selected open climb to climb back up to the 13;000 feet. When I went below the 13;000 feet it was under 4 miles before KEPEC. At the time ATC asked as to verify our altitude; we then realized our altimeter setting was wrong. It was supposed to be 29.94 and we had set 30.10 from the departure airport. We told ATC about the wrong altimeter setting and apologized. They said it was okay. Always double check your arrival with the ND and MCDU let both Pilots check the work; and monitor always. Even if it means taking over with other modes or even disconnect the autopilot if you have to; Always slow down never rush Monitor; Monitor. Make sure your altimeter setting is correct.

Data retrieved from NASA's ASRS site 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.