Large Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3
Situational Awareness
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance
Procedure; Chart Or Publication
Aircraft X either did not make or barely made the crossing restriction at ASPEN. This directly led to the controller placing unnecessary attention to the situation to ensure separation. This has been a common problem and when the sector is busy there is a high likelihood of a pilot not being able to make the restriction and conflicting with the SIZLR Arrival. There needs to be speed restrictions built into the DSNEE from both directions; possibly 280 and also 250 kts in the middle of the procedure to ensure aircraft don't slow to 220 kts too early which can cause extreme distress for the controller and force them to vector aircraft in trail off the procedure to ensure in-trail separation. This speed restriction in the middle of the procedure has been a constant issue; not all airliners fly the procedure the same and there needs to be continuity. If there is continuity the controller will be able to leave the aircraft on the procedure more often possibly leading to increased arrival rates.
SCT TRACON Controller reported an aircraft did not make the AASPN crossing restriction on the DSNEE 1 Arrival. Aircraft routinely cannot comply with many restrictions on this arrival.