RWY INCURSION.

Narrative

I WAS CLRED BY ANC GND FROM THE RAMP TO RWY 32. I TAXIED OUT OF THE RAMP TO TXWY U; MADE A R TURN ONTO TXWY U TO TXWY R; MADE A L TURN ON TXWY R WITH THE INTENT OF TAXIING TO TXWY K AND MAKING A R TURN ON TXWY K TO RWY 32. I MISTAKENLY WENT THROUGH THE INTXN OF TXWYS R AND K AND CONTINUED TO RWY 6L AND STARTED A R TURN ON RWY 6L THINKING I WAS TURNING ON TXWY K. I STOPPED WHEN I REALIZED I WAS ON RWY 6L. I CAME TO A STOP BTWN THE L EDGE AND THE CTRLINE. GND CTL CALLED ME AND RECLRED ME DOWN RWY 6L TO TXWYS H AND K TO RWY 32. RWY 6L WAS CLOSED AT THE TIME; THERE WAS NO CONFLICT WITH OTHER TFC. ANC GND TOLD ME I WAS THE SECOND ACFT TO UNINTENTIONALLY ENTER RWY 6L AT THE INTXN OF TXWY R AND RWY 6L THAT NIGHT. HE ALSO SAID THEY WERE AVERAGING 3 A WK. OTHER FACTORS: 1) TXWY R HAS BEEN EXTENDED RECENTLY. IT USED TO BE NARROW AFTER TXWY K AND HAVE A SLIGHT ANGLE TO THE R. IT WAS ALMOST A T-INTXN AT TXWYS R AND K. IT IS NOT STRAIGHT. 2) THE ARPT DIAGRAM DOES NOT DEPICT TXWY R CORRECTLY BTWN TXWY K AND RWY 6L. IT SHOWS TXWY R AT A SLIGHT ANGLE TO THE R. 3) I HAVE A LOT OF EXPERIENCE ON THE ANC ARPT ALTHOUGH IT HAS BEEN A WHILE SINCE I HAVE TAXIED OUT OF THE RAMP. I THOUGHT I KNEW MY WAY FROM THE RAMP TO RWY 32. 4) I REMEMBER LOOKING AT THE RWY LIGHTS ON RWY 32 TO HELP ME IDENT THE END OF RWY 32 AND TXWY K. I BELIEVE I CONFUSED 2 OF THE WHITE EDGE LIGHTS OF RWY 6L AS BEING AN EXTENSION OF RWY 32. THAT MADE RWY 32 LOOK LONGER THAN IT ACTUALLY IS. 5) THE INTXN OF TXWY R AND RWY 6L WAS COVERED WITH ICE AND I WAS LOOKING CLOSE INTO THE ACFT FOR THE TURN. I WAS CONCERNED THE ACFT COULD SKID AND I WOULD NOT BE ABLE TO TURN. I BELIEVE THIS IS WHY I DID NOT RECOGNIZE I WAS ENTERING THE RWY. NONE OF THE ABOVE FACTORS ARE MEANT TO BE AN EXCUSE BUT THEY WERE FACTORS. I SHOULD BE ABLE TO HANDLE EACH. I DON'T KNOW WHAT EFFECT ANY OF THE ABOVE COULD HAVE HAD IN THIS INCIDENT. I AM AT A LOSS TO EXPLAIN HOW THIS HAPPENED. I THINK THERE WAS SOME VISUAL ILLUSION THAT CAUSED THIS. THERE ARE A COUPLE OF THINGS THAT NEED TO BE DONE. FIRST; THERE SHOULD BE A NOTAM PUT OUT WARNING PLTS OF THE POSSIBILITY OF MISTAKING RWY 6L FOR TXWY K. SOMEONE SHOULD VIEW THAT INTXN FROM THE FLT DECK OF A B747 TO SEE IF THERE IS SOMETHING THAT IS MISLEADING. THEN A HUMAN FACTOR EXPERT SHOULD STUDY THIS FOR A CAUSE AND DEVELOP PROCS TO PREVENT THIS FROM HAPPENING AGAIN.