BE1900 pilot reported descending below charted altitude on a practice approach to oxr airport.

Attributes
ACN	1356280
Time
Date	201605
Local Time Of Day	1201-1800
Place
Locale Reference	OXR.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	Final Approach
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 9300 Flight Crew Type 300
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT
Miss Distance	Horizontal 0.0 Vertical 480

Narrative:

I was on recurrent pilot training flight for part 135; conducting a multiple practice approaches in point magu airspace. On my last approach in point magu airspace we selected the localizer [for the] approach to oxr. After crossing final approach fix I descended on profile were we added additional practice on abnormal procedure to this approach for pilot training purpose. At intermediate point at OM (pards) there is altitude restriction of 1680 feet for localizer approach which I penetrated. I immediately started correcting; [a few seconds later] oxnard tower gave low altitude warning which I confirmed; and stated that I [was] correcting.

Original NASA ASRS Text

Title: BE1900 pilot reported descending below charted altitude on a practice approach to OXR airport.

Narrative: I was on recurrent pilot training flight for Part 135; conducting a multiple practice approaches in Point Magu airspace. On my last approach in Point Magu airspace we selected the LOC [for the] approach to OXR. After crossing final approach fix I descended on profile were we added additional practice on abnormal procedure to this approach for pilot training purpose. At intermediate point at OM (PARDS) there is altitude restriction of 1680 feet for localizer approach which I penetrated. I immediately started correcting; [a few seconds later] Oxnard tower gave low altitude warning which I confirmed; and stated that I [was] correcting.

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.