SA227 metroliner flight crew has a runway incursion at den.

Attributes
ACN	722742
Time
Date	200707
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	agl single value : 0
Environment
Flight Conditions	IMC
Weather Elements	Snow Ice Fog
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	SA-227 AC Metro III
Operating Under FAR Part	Part 135
Flight Plan	IFR
Aircraft 2
Flight Phase	ground : taxi
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 115 flight time total : 3262 flight time type : 858
ASRS Report	722742
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	incursion : runway non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : provided flight assist none taken : detected after the fact
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

I was taxiing on sc and I had received a taxi clearance from ground to taxi to aa via taxiway M. Sc markings were covered with snow and taxiway centerline lighting was also invisible. As I searched for the centerline an aircraft was going north on taxiway M from taxiway a. At this point I was not quite to taxiway left. The snow started blowing and reduced my visibility; not sure if it was caused by the wind or propeller wash. As I concentrated to find center I saw green centerline lighting; made the l-hand turn inadvertently ending up on runway 35L. I never saw the wig wags guarding runway 35L; after I made my l-hand turn; the runway lighting didn't register until ground asked my position. I took the first reverse high speed from there to exit the runway. Because of when I picked up the green centerline lighting and I never saw the wig wags; I thought I was still on sc; and not M2.

Original NASA ASRS Text

Title: SA227 METROLINER FLT CREW HAS A RWY INCURSION AT DEN.

Narrative: I WAS TAXIING ON SC AND I HAD RECEIVED A TAXI CLRNC FROM GND TO TAXI TO AA VIA TXWY M. SC MARKINGS WERE COVERED WITH SNOW AND TXWY CTRLINE LIGHTING WAS ALSO INVISIBLE. AS I SEARCHED FOR THE CTRLINE AN ACFT WAS GOING N ON TXWY M FROM TXWY A. AT THIS POINT I WAS NOT QUITE TO TXWY L. THE SNOW STARTED BLOWING AND REDUCED MY VISIBILITY; NOT SURE IF IT WAS CAUSED BY THE WIND OR PROP WASH. AS I CONCENTRATED TO FIND CTR I SAW GREEN CTRLINE LIGHTING; MADE THE L-HAND TURN INADVERTENTLY ENDING UP ON RWY 35L. I NEVER SAW THE WIG WAGS GUARDING RWY 35L; AFTER I MADE MY L-HAND TURN; THE RWY LIGHTING DIDN'T REGISTER UNTIL GND ASKED MY POS. I TOOK THE FIRST REVERSE HIGH SPD FROM THERE TO EXIT THE RWY. BECAUSE OF WHEN I PICKED UP THE GREEN CTRLINE LIGHTING AND I NEVER SAW THE WIG WAGS; I THOUGHT I WAS STILL ON SC; AND NOT M2.

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.