Atx PIC makes approach landing when airport WX below mins.

Attributes
ACN	203720
Time
Date	199203
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gcn
State Reference	AZ
Altitude	agl bound lower : 50 agl bound upper : 546
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	descent : approach landing other
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 108 flight time total : 2034 flight time type : 87
ASRS Report	203720
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : far non adherence : published procedure non adherence other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approach: ILS DME runway 3 grand canyon national park airport. Conditions: light icing, blowing snow. As copilot I made calls at '1000 ft, 500 ft, 200 ft to go' and decision height. I then called 'missed approach.' I repeated 'we're at missed approach.' I then said that we were below our decision height. Captain refused to execute missed approach procedure but elected instead to descend an additional 100 ft below decision height (approximately 45-50 ft AGL). At this time he recognized a light and landed. Forward visibility was approximately 1/4 mi. ATIS at the time was reporting 200 ft and 1/2 mi.

Original NASA ASRS Text

Title: ATX PIC MAKES APCH LNDG WHEN ARPT WX BELOW MINS.

Narrative: APCH: ILS DME RWY 3 GRAND CANYON NATIONAL PARK ARPT. CONDITIONS: LIGHT ICING, BLOWING SNOW. AS COPLT I MADE CALLS AT '1000 FT, 500 FT, 200 FT TO GO' AND DECISION HEIGHT. I THEN CALLED 'MISSED APCH.' I REPEATED 'WE'RE AT MISSED APCH.' I THEN SAID THAT WE WERE BELOW OUR DECISION HEIGHT. CAPT REFUSED TO EXECUTE MISSED APCH PROC BUT ELECTED INSTEAD TO DSND AN ADDITIONAL 100 FT BELOW DECISION HEIGHT (APPROX 45-50 FT AGL). AT THIS TIME HE RECOGNIZED A LIGHT AND LANDED. FORWARD VISIBILITY WAS APPROX 1/4 MI. ATIS AT THE TIME WAS RPTING 200 FT AND 1/2 MI.

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.