LR31A flight crew has runway incursion at mdw.

Attributes
ACN	580749
Time
Date	200305
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Learjet 31
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 10250 flight time type : 1400
ASRS Report	580749
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 90 flight time total : 7000 flight time type : 290
ASRS Report	581122
Events
Anomaly	incursion : runway non adherence : far non adherence : clearance
Independent Detector	other controllerb
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Midway airport, captain flying aircraft, picked up clearance. I, PNF, commenced taxi checklist after getting ground clearance to taxi runway 4R via taxiway Y. I looked up and it looked like we were approaching a runway. I questioned captain, and he stated we were on correct taxiway. I saw no signs nor runway identifier sign to indicate otherwise. Ground questioned where we were going. They realized we had taxied across the active runway. No landing conflict with other aircraft. Remedy is: when in doubt, ask captain to stop aircraft and verify position.

Original NASA ASRS Text

Title: LR31A FLT CREW HAS RWY INCURSION AT MDW.

Narrative: MIDWAY ARPT, CAPT FLYING ACFT, PICKED UP CLRNC. I, PNF, COMMENCED TAXI CHKLIST AFTER GETTING GND CLRNC TO TAXI RWY 4R VIA TXWY Y. I LOOKED UP AND IT LOOKED LIKE WE WERE APCHING A RWY. I QUESTIONED CAPT, AND HE STATED WE WERE ON CORRECT TXWY. I SAW NO SIGNS NOR RWY IDENTIFIER SIGN TO INDICATE OTHERWISE. GND QUESTIONED WHERE WE WERE GOING. THEY REALIZED WE HAD TAXIED ACROSS THE ACTIVE RWY. NO LNDG CONFLICT WITH OTHER ACFT. REMEDY IS: WHEN IN DOUBT, ASK CAPT TO STOP ACFT AND VERIFY POS.

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.