Commercial Fixed Wing
Air Traffic Control Fully Certified
Communication Breakdown
ATC Issue All Types; Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Airspace Structure; Company Policy; Procedure
I was working the arrival sectors; LUCKE; MULRR; BINNS; for Dulles airport. During the afternoon arrival bank; multiple international air carriers were given descents on the HYPER7 and MAPEL2 arrivals. These aircraft were given descend via clearances for their respective runways. For this example; Aircraft X was told to descend via the MAPEL2 arrival for Runway 19C. The aircraft complied with all crossing altitudes and speeds; but once the aircraft reached waypoint COVUR; the aircraft joined the localizer (as they were instructed to do); and then also descended on the glide slope. There is a major safety issue with this! There cannot be any margin for error for this problem to keep occurring. If another aircraft is crossing below Aircraft X at 060; a major collision could occur causing many innocent people their lives. Not only is this a potential issue; but we're not even factoring in wake turbulence. What if another aircraft catches the wake of Aircraft X due to this descent? The issues are clearly present. Fix it! We have; over the last 3 years; designed brand new STARs and approaches into IAD that creates a much safer and efficient environment keeping everyone on course and happy. These designs also allow IAD to begin utilizing TRIPs which is safer and less workload on feeders. We have everything designed and ready to go just awaiting final meeting for implementation process to begin and not sure what the holdup is.
TRACON Controller reported aircraft incorrectly starting descent on ILS which creates a conflict and wake turbulence error.