B737 crew had a runway incursion on runway 12L at stl.

Attributes
ACN	465940
Time
Date	200003
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl.airport
State Reference	MO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 3000
ASRS Report	465940
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	incursion : runway non adherence : far non adherence : published procedure non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airport FAA
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : stl.tower

Narrative:

Taxi clearance was 'taxi via runway 6. Hold short of runway 12L.' runway 6 does not actually intersect runway 12L, but does intersect the approach lights of runway 12L. I was not paying close enough attention and inadvertently went beyond the hold short line about a plane length. I discovered this as I crossed the line and the first officer was telling me of that fact. The approach path was clear, as runway 12L was being used for departures. So as far as I know there was no conflict. Tower subsequently maneuvered us to the other side so we were legal again. It is a slightly different than normal situation to taxi via a runway to hold short of the approach path, but I have learned to be extra vigilant now when things are abnormal.

Original NASA ASRS Text

Title: B737 CREW HAD A RWY INCURSION ON RWY 12L AT STL.

Narrative: TAXI CLRNC WAS 'TAXI VIA RWY 6. HOLD SHORT OF RWY 12L.' RWY 6 DOES NOT ACTUALLY INTERSECT RWY 12L, BUT DOES INTERSECT THE APCH LIGHTS OF RWY 12L. I WAS NOT PAYING CLOSE ENOUGH ATTENTION AND INADVERTENTLY WENT BEYOND THE HOLD SHORT LINE ABOUT A PLANE LENGTH. I DISCOVERED THIS AS I CROSSED THE LINE AND THE FO WAS TELLING ME OF THAT FACT. THE APCH PATH WAS CLR, AS RWY 12L WAS BEING USED FOR DEPS. SO AS FAR AS I KNOW THERE WAS NO CONFLICT. TWR SUBSEQUENTLY MANEUVERED US TO THE OTHER SIDE SO WE WERE LEGAL AGAIN. IT IS A SLIGHTLY DIFFERENT THAN NORMAL SIT TO TAXI VIA A RWY TO HOLD SHORT OF THE APCH PATH, BUT I HAVE LEARNED TO BE EXTRA VIGILANT NOW WHEN THINGS ARE ABNORMAL.

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.