A C210 pilot, taxiing for takeoff at kcys, crossed assigned runway without a clearance.

Attributes
ACN	549853
Time
Date	200206
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cys.airport
State Reference	WY
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	general aviation : personal
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C, 210D
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 9 flight time total : 450 flight time type : 120
ASRS Report	549853
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	incursion : runway non adherence : published procedure non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Airport
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was given instructions by ground to taxi to runway 8 via taxiway alpha. I continued down taxiway alpha and mistakenly crossed runway 8 instead of holding short and doing my runup as instructed. I don't know why, but I thought I was crossing runway 12/30 and had been given permission to do so. I think contributing factors were time of evening, with darkness approaching (sunset) and the fact that cys is not that familiar to me, although I have been there before. Also, I seldom fly at controlled airports. The airport was not busy and no other aircraft were involved.

Original NASA ASRS Text

Title: A C210 PLT, TAXIING FOR TKOF AT KCYS, CROSSED ASSIGNED RWY WITHOUT A CLRNC.

Narrative: I WAS GIVEN INSTRUCTIONS BY GND TO TAXI TO RWY 8 VIA TXWY ALPHA. I CONTINUED DOWN TXWY ALPHA AND MISTAKENLY CROSSED RWY 8 INSTEAD OF HOLDING SHORT AND DOING MY RUNUP AS INSTRUCTED. I DON'T KNOW WHY, BUT I THOUGHT I WAS XING RWY 12/30 AND HAD BEEN GIVEN PERMISSION TO DO SO. I THINK CONTRIBUTING FACTORS WERE TIME OF EVENING, WITH DARKNESS APCHING (SUNSET) AND THE FACT THAT CYS IS NOT THAT FAMILIAR TO ME, ALTHOUGH I HAVE BEEN THERE BEFORE. ALSO, I SELDOM FLY AT CONTROLLED ARPTS. THE ARPT WAS NOT BUSY AND NO OTHER ACFT WERE INVOLVED.

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.