A DC9-50 BEING TAXIED FROM THE HANGAR TO THE GATE EXECUTED A RWY INCURSION DUE TO REDUCED VISIBILITY; POOR CREW COM; AND POOR TXWY MARKINGS.

Narrative

AFTER ENG START WE PULLED OUT ON HANGAR RAMP IN FRONT OF HANGAR X AND STOPPED TO CALL TWR FOR CLRNC. TWR GAVE TXWYS A; C; P TO XX. I ACKNOWLEDGED TXWYS A; C; P. WE PROCEEDED DOWN RAMP AROUND TO TXWY A; HDG W. AS WE CAME ABEAM APPROX END OF F CONCOURSE; TWR CALLED AND ASKED US TO RPT WHEN WE GOT TO SPOT 6 FOR GND RADAR CHK. I ACKNOWLEDGED. WE PASSED SPOT 16 AND I TOLD TWR WE HAD JUST PASSED SPOT 16. TWR REPLIED; 'JUST RPT AT SPOT 6.' I ACKNOWLEDGED. THIS WAS AT ABOUT THE WIDE OPEN AREA AT TXWYS A-D AND VISIBILITY SEEMED TO BE WORSE AS WE ANGLED TOWARD TXWY C. AT THIS TIME WE WERE SEARCHING FOR SPOT 6 MARKER; AND I WAS LOOKING TO THE R FOR TXWY C TURNOFF. LOOKING FORWARD FOR SPOT 6 AGAIN; I MUST HAVE MISSED THE TXWY D TURN WHILE TALKING TO TWR EARLIER; AND THEN THOUGHT TXWY C WAS TXWY D. WE PASSED WHAT WAS ACTUALLY TXWY C AND I SAW THE BLUE TXWY LIGHTS TO THE R AND SLIGHTLY FORWARD AND THOUGHT THAT WAS THE R SIDE OF TXWY C. AS WE PASSED; I NEVER SAW THE HOLD SHORT MARKING FOR RWY 4/22 AND NOTICED THE WHITE RWY LIGHTS AND WHITE SHOULDER STRIPE. AT THIS POINT; I KNEW WE HAD BEGUN TO CROSS RWY 4/22 AND I SAID 'THAT'S THE RWY!' WE WERE COMMITTED TO AND HAD TO CONTINUE TO CROSS TO CLR THE RWY. AT THIS POINT TWR TOLD US TO STOP. THEN I ASKED TWR IF HE COULD SEE US. HE ACKNOWLEDGED. HE CLRED US R ON TXWY M; R ON TXWY P TO RWY XX. COMING ACROSS RWY 4/22 ON TXWY P; THE ENTIRE LENGTH OF TXWY P WAS CLR AND VISIBILITY GOOD. TWR NOTIFIED US OF THE EVENT. FACTORS: FOG POCKET; SEARCHING FOR SPOT 6; RADIO COM WHILE SEARCHING; POOR COM OF CREW; NO HELP FROM TWR OFFERED; NO MARKINGS ON THE TAXI LINE WITH SIGNS TOO FAR TO THE SIDE -- MAYBE BLIND SPOT FROM WINDOW POST. MULTI-TASKING. CONCENTRATING ON LOOKING THROUGH FOG FOR REFS INSTEAD OF CONCENTRATING ON TXWY MARKINGS.