T6A Texan II / Harvard II (Raytheon)
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 7
Situational Awareness; Communication Breakdown
ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
Human Factors
Aircraft X was inbound to APA from the southeast. I put him on a 260 heading and descended him to 090 because he was pointed at the 085 MVA. His read back was 090. I noticed him at 078 so I said climb and maintain 090; he did not respond. I issued a low altitude alert and climbed him immediately to 090. This time responded and said he was climbing. He said he had heard 070. I went and listened to it when I went on break and he read back 090. Pilot listening better.
Denver TRACON Controller reported an aircraft reading back the correct altitude but not descending to the correct altitude as assigned.