Fat controller reported an aircraft cleared for the ILS-Y that did not intercept final and descended...

Attributes
ACN	1597968
Time
Date	201811
Local Time Of Day	1801-2400
Place
Locale Reference	FAT.TRACON
State Reference	CA
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 5
Events
Anomaly	ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Track / Heading All Types Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X was cleared for the ILS-Y on the ALTTA8. Aircraft was told to cross altta at or above 4;000 [feet]. It appeared the aircraft did not intercept the localizer and continued current heading off of altta and also continued to descend. Aircraft was told to turn to heading of 270 to intercept localizer and maintain 3;500 [feet]. Aircraft continued to descend. Low altitude alert was issued. Aircraft climbed and was reissued the ILS-Y.I will monitor the aircrafts approach more closely.

Original NASA ASRS Text

Title: FAT Controller reported an aircraft cleared for the ILS-Y that did not intercept final and descended resulting in a Low Altitude Alert having to be issued along with a new approach clearance.

Narrative: Aircraft X was cleared for the ILS-Y on the ALTTA8. Aircraft was told to cross ALTTA at or above 4;000 [feet]. It appeared the aircraft did not intercept the localizer and continued current heading off of ALTTA and also continued to descend. Aircraft was told to turn to heading of 270 to intercept localizer and maintain 3;500 [feet]. Aircraft continued to descend. Low altitude alert was issued. Aircraft climbed and was reissued the ILS-Y.I will monitor the aircrafts approach more closely.

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.

Fat controller reported an aircraft cleared for the ILS-Y that did not intercept final and descended resulting in a low altitude alert having to be issued along with a new approach clearance.