Narrative:

Called ground control for taxi to active. Told to taxi to runway 4R. I thought I was on taxiway left when in fact I was on taxiway B. Taxiway left proceeds west from south ramp (louisiana airport) of baton rouge metropolitan. So does taxiway B. Taxiway east intersects txwys left and B. If I was on taxiway left (like I thought I was) you take a right turn on taxiway east to go to end of runway 4R. I was actually on taxiway B and that right turn took me across runway 13 and onto runway 4R without knowing it. Ground control called me and said I was on runway 4R without clearance from tower and was told to back taxi on runway 4R to end of it and call tower. I was totally confused since I was sure I was on txwys left and east (not taxiway B). Contributing factors were, I was distracted during taxi by a fluctuating right fuel pressure gauge, the air conditioner had stopped cooling and I was trying to get it going again, and the captain was pressurizing on the ground and I was working with it. Also, I have never been told to use runway 4R before and was unsure how to get to it even with the airport diagram lying on the copilot's seat. Add to that, I just found out I'm being laid off and out of a job! (Stress factor I guess.) (also, I was late getting the plane and behind schedule for meeting the buyer.) I never had anything like this happen before in 30 yrs flying. A bad day! Supplemental information from acn 561525: aircraft X, a PA31T, was taxiing from the south ramp to runway 4R when he passed up the runway entrance. I entered an active runway 13. At the time aircraft Y, a SR22 was on a 1/4 mi final. I sent aircraft Y around. No loss of separation occurred. The pilot of aircraft X was advised he had taxied onto an active runway. His response was that he was cleared to runway 4R. The ground controller advised him that he was told to taxi to runway 4R.

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Original NASA ASRS Text

Title: A PA31 PLT, TAXIING FOR TKOF AT BTR, TAXIED ONTO AN ACTIVE RWY, REQUIRING TWR TO INITIATE A GAR TO TFC ON FINAL.

Narrative: CALLED GND CTL FOR TAXI TO ACTIVE. TOLD TO TAXI TO RWY 4R. I THOUGHT I WAS ON TXWY L WHEN IN FACT I WAS ON TXWY B. TXWY L PROCEEDS W FROM S RAMP (LOUISIANA ARPT) OF BATON ROUGE METRO. SO DOES TXWY B. TXWY E INTERSECTS TXWYS L AND B. IF I WAS ON TXWY L (LIKE I THOUGHT I WAS) YOU TAKE A R TURN ON TXWY E TO GO TO END OF RWY 4R. I WAS ACTUALLY ON TXWY B AND THAT R TURN TOOK ME ACROSS RWY 13 AND ONTO RWY 4R WITHOUT KNOWING IT. GND CTL CALLED ME AND SAID I WAS ON RWY 4R WITHOUT CLRNC FROM TWR AND WAS TOLD TO BACK TAXI ON RWY 4R TO END OF IT AND CALL TWR. I WAS TOTALLY CONFUSED SINCE I WAS SURE I WAS ON TXWYS L AND E (NOT TXWY B). CONTRIBUTING FACTORS WERE, I WAS DISTRACTED DURING TAXI BY A FLUCTUATING R FUEL PRESSURE GAUGE, THE AIR CONDITIONER HAD STOPPED COOLING AND I WAS TRYING TO GET IT GOING AGAIN, AND THE CAPT WAS PRESSURIZING ON THE GND AND I WAS WORKING WITH IT. ALSO, I HAVE NEVER BEEN TOLD TO USE RWY 4R BEFORE AND WAS UNSURE HOW TO GET TO IT EVEN WITH THE ARPT DIAGRAM LYING ON THE COPLT'S SEAT. ADD TO THAT, I JUST FOUND OUT I'M BEING LAID OFF AND OUT OF A JOB! (STRESS FACTOR I GUESS.) (ALSO, I WAS LATE GETTING THE PLANE AND BEHIND SCHEDULE FOR MEETING THE BUYER.) I NEVER HAD ANYTHING LIKE THIS HAPPEN BEFORE IN 30 YRS FLYING. A BAD DAY! SUPPLEMENTAL INFO FROM ACN 561525: ACFT X, A PA31T, WAS TAXIING FROM THE S RAMP TO RWY 4R WHEN HE PASSED UP THE RWY ENTRANCE. I ENTERED AN ACTIVE RWY 13. AT THE TIME ACFT Y, A SR22 WAS ON A 1/4 MI FINAL. I SENT ACFT Y AROUND. NO LOSS OF SEPARATION OCCURRED. THE PLT OF ACFT X WAS ADVISED HE HAD TAXIED ONTO AN ACTIVE RWY. HIS RESPONSE WAS THAT HE WAS CLRED TO RWY 4R. THE GND CTLR ADVISED HIM THAT HE WAS TOLD TO TAXI TO RWY 4R.

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.