TRACON controller reported an aircraft descended below the charted assigned altitude of an RNAV arri...

Attributes
ACN	1454673
Time
Date	201706
Local Time Of Day	0001-0600
Place
Locale Reference	SJC.Airport
State Reference	CA
Aircraft 1
Make Model Name	Light Transport
Flight Phase	Descent
Route In Use	STAR BRIXX
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 13.5
Events
Anomaly	ATC Issue All Types Deviation - Altitude Overshoot Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

Aircraft X was on the brixx RNAV arrival into sjc. After brixx; aircraft X started to descend out of 12;000 feet for 7;000 feet. 12;000 feet is the bottom altitude on the brixx arrival; not 7;000 feet. I continually have aircraft fly this arrival incorrectly. Pilots see 7;000 feet (which is a MEA altitude) and begin their descent. This is a major problem that my facility is aware of and rumored to be fixing. The unsafe part of all of this is that the sfo arrivals are directly below this route at 11;000 feet. What is it going to take to make it more clear to pilots?this seems to happen with general aviation business jet pilots and foreign aircraft pilots. Make it clearer that 12;000 feet is the final altitude on the brixx arrival.

Original NASA ASRS Text

Title: TRACON Controller reported an aircraft descended below the charted assigned altitude of an RNAV arrival. The controller stated this is a recurring issue.

Narrative: Aircraft X was on the BRIXX RNAV arrival into SJC. After BRIXX; Aircraft X started to descend out of 12;000 feet for 7;000 feet. 12;000 feet is the bottom altitude on the BRIXX arrival; not 7;000 feet. I continually have aircraft fly this arrival incorrectly. Pilots see 7;000 feet (which is a MEA altitude) and begin their descent. This is a major problem that my facility is aware of and rumored to be fixing. The unsafe part of all of this is that the SFO arrivals are directly below this route at 11;000 feet. What is it going to take to make it more clear to pilots?This seems to happen with general aviation business jet pilots and foreign aircraft pilots. Make it clearer that 12;000 feet is the final altitude on the BRIXX arrival.

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.

TRACON controller reported an aircraft descended below the charted assigned altitude of an RNAV arrival. The controller stated this is a recurring issue.