CAPT OF AN LGT COMPLAINED TO SFO TWR CTLR TO A B747 HOLDING BTWN HIS L PARALLEL RWY AND THE R WITH THE ACFT TAIL OVER THE HOLD SHORT LINE; BUT CLR OF THE RWY. THE TWR ACKNOWLEDGED AND SENT THE NEXT ACFT AROUND.

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LNDG RWY 28L SFO. A B747-400 WAS SITTING BTWN 2 RWYS. I DIDN'T NOTICE HE WAS STICKING HIS TAIL OVER THE HOLD LINE TO MY RWY (RWY 28L) UNTIL WE WERE ABOUT 75 FT AGL. I DETERMINED WE COULD LAND SAFELY AND THAT WAS THE SAFEST COURSE OF ACTION. THE FO WAS FLYING. I ADVISED SFO TWR AND THEY HAD THE ACFT BEHIND US GO AROUND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HIS ACFT WAS A B757 AND THE OTHER ACFT WAS A B747-400. HE FURTHER STATED THAT HE COULD SEE THAT THE B747 HAD NOT PULLED UP TO THE HOLD SHORT LINE AND IF HE HAD; HIS TAIL WOULD HAVE BEEN CLR OF THE OTHER HOLD SHORT LINE. HE ALSO NOTED THAT THE B747 PULLED UP AND CLR OF THE HOLD SHORT LINE AFTER HIS REMARK TO THE TWR THAT 'THE B747'S TAIL IS 30 FT OVER THE HOLD SHORT LINE.' HE BELIEVES THAT THIS IS AN ISOLATED INCIDENT SINCE HE HAS HELD AT THAT LOCATION BEFORE AND FOUND SUFFICIENT ROOM TO HOLD BTWN THE HOLD LINES. ALSO; THE TWR APPARENTLY NOT NOTICED THE B747 HANGING OVER UNTIL THE RPTR ALERTED THEM SINCE THE TWR SENT ANOTHER ACFT AROUND BEHIND HIM UNTIL THE B747 MOVED UP TO HIS HOLD SHORT LINE.