C182 pilot received an ATC low altitude alert from ATC during ILS approach into cno.

Attributes
ACN	559104
Time
Date	200209
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cno.airport
State Reference	CA
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cno.tower
Operator	general aviation : personal
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : ns
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 20 flight time total : 1300 flight time type : 600
ASRS Report	559104
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	aircraft equipment : altitude alert other controllera
Resolutory Action	controller : issued alert none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Airspace Structure
Primary Problem	Flight Crew Human Performance

Narrative:

I was on an IFR flight plan from poc to cno. It was VMC. I was making the ILS approach into cno. I had been cleared for the approach by socal approach and had been switched to chino tower. As I was following the localizer/GS on the approach, the chino tower operator suddenly announced 'low altitude alert, low altitude alert. Chino ILS minimum altitude 836 ft' and gave the chino altimeter setting. At the time, I was at about 1500 ft MSL and '2 dots' low on the GS. I checked the altimeter setting and it was correct. Since I was only slightly low on the GS, and well above the decision ht for the approach, I'm not sure why the tower operator was concerned but am filing this report in case he reports I 'busted' an altitude restr.

Original NASA ASRS Text

Title: C182 PLT RECEIVED AN ATC LOW ALT ALERT FROM ATC DURING ILS APCH INTO CNO.

Narrative: I WAS ON AN IFR FLT PLAN FROM POC TO CNO. IT WAS VMC. I WAS MAKING THE ILS APCH INTO CNO. I HAD BEEN CLRED FOR THE APCH BY SOCAL APCH AND HAD BEEN SWITCHED TO CHINO TWR. AS I WAS FOLLOWING THE LOC/GS ON THE APCH, THE CHINO TWR OPERATOR SUDDENLY ANNOUNCED 'LOW ALT ALERT, LOW ALT ALERT. CHINO ILS MINIMUM ALT 836 FT' AND GAVE THE CHINO ALTIMETER SETTING. AT THE TIME, I WAS AT ABOUT 1500 FT MSL AND '2 DOTS' LOW ON THE GS. I CHKED THE ALTIMETER SETTING AND IT WAS CORRECT. SINCE I WAS ONLY SLIGHTLY LOW ON THE GS, AND WELL ABOVE THE DECISION HT FOR THE APCH, I'M NOT SURE WHY THE TWR OPERATOR WAS CONCERNED BUT AM FILING THIS RPT IN CASE HE RPTS I 'BUSTED' AN ALT RESTR.

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.