Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2.6
Situational Awareness
Aircraft Equipment Problem Less Severe; Airspace Violation All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Separated Traffic; Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Became Reoriented
Procedure; Chart Or Publication; Manuals; Aircraft
Aircraft X checked on descending to and almost level at 24000 feet RNAV arrival. I told the pilot to descend via the arrival and the pilot read it back correctly. The aircraft leveled at 24000 feet. I then saw the aircraft descend below 24000 feet prior to the fix which has a published altitude of 24000 feet. I stopped their descent; but not before they violated the underlying sector's airspace. I told the pilot the published altitude at the fix and asked why they descended early. They said the computer did it. Once they were in my airspace I gave them a descent clearance.
[Report narrative contained no additional information.]
ZBW Center Controller and flight crew reported the aircraft descended below a published crossing restriction.