Sct TRACON controller reported an aircraft did not make the aaspn crossing restriction on the dsnee ...

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1452987
Time
Date	201703
Local Time Of Day	0601-1200
Place
Locale Reference	SCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR DSNEE1
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3
Events
Anomaly	ATC Issue All Types Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance

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.