FLC OF GULFSTREAM IV RECEIVES A TAXI CLRNC TO HOLD SHORT OF RWYS 18-36 WHICH INTERSECTS WITH RWY 3-21 CLOSE TO THE TXWY XING. FLC HOLDS SHORT PRIOR TO RWY 18-36 BUT SEES NO HOLD LINE. AN ACR IS SENT AROUND. CTLR EXPECTED FLC TO HOLD SHORT AT THE RWY 3-21 HOLD LINE BUT DID NOT STATE THIS.

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I WAS ACTING AS CAPT (PNF) OF A GULFSTREAM IV OPERATED UNDER FAR PART 91; FLYING FROM HPN TO DCA. WE LANDED AT DCA ON RWY 15. THE TWR CTLR TOLD US TO CLR AT ANY R WHICH WOULD HAVE BEEN RWY 21 OR AT THE END OF RWY 15 ONTO TXWY F. HE ALSO INSTRUCTED US TO HOLD SHORT OF RWY 18/36. WE ACKNOWLEDGED HIS CLRNC WITH A READBACK OF 'ROGER; CLRED ANY R HOLD SHORT RWY 18.' AS WE APCHED THE INTXN OF RWY 3/21 ON TXWY F; WE SAW A HOLD SHORT SIGN AND MARKINGS FOR RWY 3/21. MY FO; WHO WAS THE PF; ASKED IF WE WERE CLRED ONTO RWY 3/21. I STATED; 'YES; WE WERE TOLD TO HOLD SHORT OF RWY 18/36.' AS WE CONTINUED ACROSS THE RWY 3/21 HOLD SHORT LINE AND STOPPED THE ACFT ON RWY 3/21 SHORT OF RWY 18/36; I SAW AND COMMENTED TO MY FO THAT THERE WAS AN ACR ACFT DEPARTING FROM RWY 18 AND THAT A B727 WAS ON A SHORT FINAL. AT THIS TIME THE TWR CTLR TOLD US AGAIN TO HOLD SHORT OF RWY 18/36 -- WE INDICATED TO HIM THAT WE WERE STOPPED AND HOLDING SHORT OF RWY 18/36. HE THEN TOLD US WE HAD CROSSED THE HOLD SHORT LINE FOR RWY 18/36 AND THEN IMMEDIATELY TOLD THE B727 TO GAR DUE TO AN ACFT OVER THE HOLD SHORT LINE. AFTER THE B727 WENT AROUND; HE THEN CLRED US VIA A L TURN DOWN RWY 21 WITH A R TURN ONTO THE MAIN RAMP; AND THEN TOLD US TO CONTACT THE GND CTLR WHEN ON THE MAIN RAMP. WE THEN TAXIED INTO SIGNATURE. AFTER DEPLANING OUR PAX; I WENT INTO THE FBO AND CONTACTED THE TWR SUPVR. I ASKED HIM IF IT WOULD BE POSSIBLE FOR US TO COME UP TO THE TWR AND TALK TO HIM ABOUT THE PROB WE JUST HAD. DURING OUR MEETING WITH THE TWR SUPVR AND THE TWR CTLR THAT HAD HANDLED US; WE INDICATED TO THEM THAT WE UNDERSTOOD THE CLRNC AS 'TO HOLD SHORT OF RWY 18/36 AND WE COULD TAXI ONTO RWY 3/21 AT OUR DISCRETION.' THEY SAID; 'YOU'RE CORRECT.' WE THEN STATED THAT WE DID NOT SEE A HOLD SHORT LINE OR SIGNAGE FOR A HOLD SHORT LINE WHILE WE WERE ON TXWY F FOR RWY 18/36. WE ALSO INDICATED TO HIM THAT WE THOUGHT WE HAD STOPPED AT AN APPROPRIATE SAFE DISTANCE FROM RWY 18/36. THE TWR SUPVR TOLD US THAT THE HOLD SHORT LINE FOR RWY 18/36 HAD BEEN REMOVED BY THE ARPT. AS WE LOOKED DOWN FROM THE TWR ONTO TXWY F YOU COULD SEE WHERE A HOLD SHORT LINE HAD BEEN REMOVED. I ASKED HIM IF THERE WAS GOING TO BE A PROB REGARDING THIS MATTER. HE INDICATED 'NO.' I TOLD HIM THAT I WAS GOING TO FILE A NASA RPT REGARDING THIS MATTER. I BELIEVE THAT MY ACFT AT NO TIME WAS IN AN UNSAFE POS OR OPERATED IN AN UNSAFE MANNER; AS TO CAUSE A POTENTIAL HAZARD TO ANY ACFT ON RWY 18. I THINK THIS PROB COULD BE CORRECTED BY INSTALLING APPROPRIATE SIGNAGE AND MARKINGS INDICATING WHERE THE HOLD SHORT LINE FOR RWY 18/36 IS WHEN TAXIING ON TXWY F. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE ALSO SPOKE WITH HIS COMPANY REGARDING THE INCIDENT AND THE LACK OF HOLD SHORT LINE AT RWY 18/36. FROM THE TWR THE OLD LINE WHICH HAS BEEN ELIMINATED IS STILL VERY VISIBLE AS A BLACK AREA; BUT NOT DOWN AT THE LEVEL OF THE TXWY. THE SIGNAGE THAT COORDINATED WITH THE FORMER HOLD SHORT LINE HAS BEEN REMOVED. RPTR HAD NOT TAXIED AS FAR AS THE OLD HOLD LINE BECAUSE HE WANTED TO REMAIN FURTHER BACK FROM THE RWY. THE CTLR; HOWEVER; EXPECTED HIM TO HOLD AT THE RWY 3/21 HOLD LINE AND SIGHTED HIM BEYOND THAT POS. THAT IS WHY HE INITIATED THE GAR. THE CLRNC DID NOT SPECIFY THAT HOLDING POINT AND THAT IS WHAT CAUSED THE CONFUSION. THERE IS A HOLDING LINE FOR RWY 18/36 PLACED ACTUALLY ON RWY 3/21 BUT IT IS LOCATED PRIOR TO THE POINT OF TXWY F XING RWY 3/21. THIS WAS NOT VISIBLE FROM THE ACFT POS. RPTR IS ADAMANT ABOUT TRYING TO CORRECT THIS SO THAT NO ONE ELSE WILL HAVE THE PROB; AND NO ACFT WILL BE SENT AROUND UNNECESSARILY AGAIN.