Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Situational Awareness
Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Flight Crew Returned To Clearance
Human Factors; Aircraft; Chart Or Publication
Flying the KAROO Arrival into RDU; I asked the First Officer to select the lowest altitude on the arrival which was 6;000 MSL. I pulled up the direct/intercept screen and looked at the VSI rates required to meet all the restrictions and I selected a VSI rate of 900 FPM which I thought would meet all the restrictions. I must have not thought it out correctly because we descended below the floor of one of the restrictions by 500 FT. I immediately noticed and entered a climb back up to the appropriate altitude. ATC said nothing to us and we continued the flight without further incident.This happened because I set an incorrect descent rate to meet all the restrictions. Also; I have learned my lesson that I should always set the individual floors of the arrivals one by one instead of just asking for the lowest altitude of the arrival to be set. If I had asked the First Officer to set the first floor; then the second; then the third and so forth this problem would never have happened. In the future I will do it that way.
We went 500 FT below the charted altitude crossing ARGAL...The altitude deviation occurred because the Captain put in a rate of descent that would allow us to cross the last fix [as required] versus the intermediate fixes.
The flight crew of a CRJ-700 failed to comply with the crossing restriction at ARGAL on the KAROO RNAV STAR to RDU.