C208 pilot lands below RVR minimums.

Attributes
ACN	719973
Time
Date	200612
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bfi.airport
State Reference	WA
Altitude	agl single value : 50
Environment
Weather Elements	Fog
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bfi.tower
Operator	common carrier : air taxi
Make Model Name	Caravan 1 208A
Operating Under FAR Part	Part 135
Navigation In Use	ils localizer & glide slope : 13r
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 2200 flight time type : 400
ASRS Report	719973
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	inflight encounter : weather non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Weather Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

En route to airport VFR when fog came in. I picked up the IFR clearance for approach 2 NM outside FAF. Above MDA I saw approach lights on ILS and continued below MDA. I saw green threshold lights and continued to landing. During landing phase approximately 25-50 ft above airport fog became very thick. I maintained visual with runway at all times during landing; but tower reported RVR as 1400 ft and visibility for approach is 1 NM. I continued to touch down since I had runway in sight; but time of landing visibility was below prescribed minimums for us. Aircraft (jet) just prior to me on approach also landed. I thought landing since I had runway in sight was more safe than going missed so close to runway and going visually to IMC in rapidly decreasing WX conditions. (Normal landing and touchdown with taxi was made.)

Original NASA ASRS Text

Title: C208 PLT LANDS BELOW RVR MINIMUMS.

Narrative: ENRTE TO ARPT VFR WHEN FOG CAME IN. I PICKED UP THE IFR CLRNC FOR APCH 2 NM OUTSIDE FAF. ABOVE MDA I SAW APCH LIGHTS ON ILS AND CONTINUED BELOW MDA. I SAW GREEN THRESHOLD LIGHTS AND CONTINUED TO LNDG. DURING LNDG PHASE APPROX 25-50 FT ABOVE ARPT FOG BECAME VERY THICK. I MAINTAINED VISUAL WITH RWY AT ALL TIMES DURING LNDG; BUT TWR RPTED RVR AS 1400 FT AND VISIBILITY FOR APCH IS 1 NM. I CONTINUED TO TOUCH DOWN SINCE I HAD RWY IN SIGHT; BUT TIME OF LNDG VISIBILITY WAS BELOW PRESCRIBED MINIMUMS FOR US. ACFT (JET) JUST PRIOR TO ME ON APCH ALSO LANDED. I THOUGHT LNDG SINCE I HAD RWY IN SIGHT WAS MORE SAFE THAN GOING MISSED SO CLOSE TO RWY AND GOING VISUALLY TO IMC IN RAPIDLY DECREASING WX CONDITIONS. (NORMAL LNDG AND TOUCHDOWN WITH TAXI WAS MADE.)

Data retrieved from NASA's ASRS site as of January 2009 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.