COCKPIT COORD BREAKDOWN PRIMARILY CAUSES RWY INCURSION AT PBI.

Narrative

WHILE TAXIING TO RWY 9L AT PBI; ACFT Y CROSSED RWY 13/31 ON TXWY C; AN ACFT LANDED ON RWY 13 JUST AFTER ACFT Y CROSSED RWY 13. PF DID NOT HEAR ATC TO 'HOLD' AT RWY 13/31; PNF STATES THAT ATC INSTRUCTED ACFT Y TO HOLD; BUT DID NOT WARN PF TO HOLD. WHEN PF APCHED RWY 13/31 TO CROSS ATC CTLR WAS WORKING GND AND TWR FREQUENCIES. ATC WAS LNDG ACFT ON RWY 09; RWY 13 AND CTLRING TAXIING ACFT TO AND FROM EACH RWY. NO RWY SIGNS WERE LIGHTED TO 'MARK' THE INTERSECT OF RWY 13/31 AT C. PF AND PNF DID NOT KNOW THAT ACFT Y HAD CROSSED RWY 13/31 UNTIL ACFT LANDED BEHIND ACFT Y'S CROSSING RWY 13/31. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS PIC OF A LJ24; UNDER OWNERSHIP OF A PRIVATE OPERATOR. THE PIC STATED THE BIGGEST PROB WAS THE BREAKDOWN IN CREW COORD. OTHER DISTRS WERE MULTIPLE XMISSIONS TO ACFT NOT ON THEIR FREQ AND NOT BEING FAMILIAR WITH THE ARPT. THE EVENT WAS REVIEWED BY COMPANY PERSONNEL. SUPPLEMENTAL INFO: TWR SPECIALIST ADVISED THAT ARPT SIGNAGE HAD BEEN UPGRADED RECENTLY. ANY BREAKAGE OR UNSATISFACTORY CONDITION RPT WAS QUICKLY RESPONDED TO BY ARPT PERSONNEL. THE SPECIALIST ADVISED THAT HE WAS NOT AWARE OF ANY RECENT SIGNAGE COMPLAINTS.