Dash 8 Series Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Situational Awareness; Distraction
Aircraft Equipment Problem Less Severe; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew FLC Overrode Automation; Flight Crew Returned To Clearance
Human Factors; Aircraft
Instructed to descend from 4;000 feet to 3;000 feet while the airplane was at approximately 4;100 feet. I selected 3;000 feet and both pilot confirmed ALT SEL was still selected. At approximately 5NM from FAF on 4R on heading 090 while looking for traffic and airport I realized the airplane was descending through 2;400 feet (no automation inputs from the Pilot Flying (PF) while altitude was capturing and no altitude deviation warning sound). I immediately turned the autopilot off and started climbing back to 3;000 feet while the Pilot Monitoring (PM) reported our deviation to ATC. ATC replied saying it was no problem and to descend to 2;000 feet and asked if we had the airport in sight. We reported the airport in sight and were cleared for the visual approach to 4R.
[Report Narrative Contained No Additional Information].
A DHC-8 flight crew; cleared to descend to 3000 feet got distracted and failed to note the aircraft hadn't leveled but instead descended to ~2300 feet at which point they intervened and climbed back to 3000 feet.