ATC TRACON controller reported using a procedure no longer authorized which resulted in vectoring an...

Attributes
ACN	1505700
Time
Date	201712
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	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 6.0
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X checked on descending to 6300 feet. I turned the aircraft heading 280 and descended them to 5200 feet. They violated the 6300 foot minimum vectoring altitude (MVA) by 100 feet; and the 5800 foot MVA by 200 feet. My instruction to descend the aircraft to 5200 feet was too soon and resulted in a loss.we previously had a 'step down procedure' for aircraft landing from the east. This allowed us to descend into the MVA between heading 220 clockwise to 320. The first step was 5000 feet; then 4000 feet; then 3000 feet. This was a great tool that allowed us to easily descend aircraft from the east. In the area that I violated by 100 and 200 feet; we were previously authorized to descend to 5000 feet. This tool was taken away from us and it is my recommendation that we bring it back. Bring back the step down procedure for arrivals into from the east.

Original NASA ASRS Text

Title: ATC TRACON Controller reported using a procedure no longer authorized which resulted in vectoring an arriving aircraft below the Minimum Vectoring Altitude.

Narrative: Aircraft X checked on descending to 6300 feet. I turned the aircraft heading 280 and descended them to 5200 feet. They violated the 6300 foot Minimum Vectoring Altitude (MVA) by 100 feet; and the 5800 foot MVA by 200 feet. My instruction to descend the aircraft to 5200 feet was too soon and resulted in a loss.We previously had a 'step down procedure' for aircraft landing from the east. This allowed us to descend into the MVA between heading 220 clockwise to 320. The first step was 5000 feet; then 4000 feet; then 3000 feet. This was a great tool that allowed us to easily descend aircraft from the east. In the area that I violated by 100 and 200 feet; we were previously authorized to descend to 5000 feet. This tool was taken away from us and it is my recommendation that we bring it back. Bring back the step down procedure for arrivals into from the east.

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.

ATC TRACON controller reported using a procedure no longer authorized which resulted in vectoring an arriving aircraft below the minimum vectoring altitude.