A BE20 flight crew is advised of a low altitude alert from sct TRACON which turned out to be a false alarm 5 mi from smo, ca.

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Attributes
ACN	479130
Time
Date	200007
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : smo.airport
State Reference	CA
Altitude	msl single value : 1100
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	general aviation : corporate
Make Model Name	Super King Air 200 HDC
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	descent : intermediate altitude
Route In Use	approach : instrument non precision
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 8100 flight time type : 700
ASRS Report	479130
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	inflight encounter : weather other anomaly other
Independent Detector	atc equipment : msaw other controllera
Resolutory Action	controller : issued advisory none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Facility ATC Human Performance Aircraft
Primary Problem	ATC Facility

Narrative:

We were on the VOR-a approach at smo and had descended to 1110 ft MSL -- the MDA for that section of the approach. The tower said they had a low altitude alert on us. We advised them of our altitude, and they said our descent rate may have set off their low altitude alarm on the radar even though we weren't below the published descent altitude.

Original NASA ASRS Text

Title: A BE20 FLC IS ADVISED OF A LOW ALT ALERT FROM SCT TRACON WHICH TURNED OUT TO BE A FALSE ALARM 5 MI FROM SMO, CA.

Narrative: WE WERE ON THE VOR-A APCH AT SMO AND HAD DSNDED TO 1110 FT MSL -- THE MDA FOR THAT SECTION OF THE APCH. THE TWR SAID THEY HAD A LOW ALT ALERT ON US. WE ADVISED THEM OF OUR ALT, AND THEY SAID OUR DSCNT RATE MAY HAVE SET OFF THEIR LOW ALT ALARM ON THE RADAR EVEN THOUGH WE WEREN'T BELOW THE PUBLISHED DSCNT ALT.

Data retrieved from NASA's ASRS site as of July 2007 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.