AFTER BEING CLRED FOR AN ILS APCH AND LNDG PHL RWY 27R; AN LJ55 CREW WERE NOT SURE IF THE TWR HAD CLRED THEM TO LAND ON RWY 26.

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ON DEC/FRI/02 AT APPROX XA55; WE WERE ABOUT 5 SECONDS FROM FLARE ON AN ILS RWY 27R APCH TO PHL; WHEN WE WERE INSTRUCTED BY PHL TWR TO GO AROUND. THE PF COMMENCED AN UNEVENTFUL GAR AND WE RETURNED FOR LNDG ON RWY 27R. THE TWR INFORMED US ON THE GAR THAT WE HAD BEEN CLRED TO LAND ON RWY 26. THE FOLLOWING ARE THE EVENTS THAT LED UP TO THE GAR. WHEN WE FIRST TALKED TO PHL APCH; WE REQUESTED RWY 27R; AND WERE TOLD TO EXPECT THE ILS RWY 27R APCH. WE WERE THEN VECTORED FOR THE ILS RWY 27R; AND THEN CLRED FOR THE ILS RWY 27R. APCH POINTED OUT A LEAR 55 ON THE APCH FOR RWY 26. WE CALLED TFC IN SIGHT AND WERE TOLD BY APCH TO MAINTAIN VISUAL SEPARATION WITH THE LEAR 55. (WE WERE NOT TOLD TO FOLLOW THE LEAR 55.) WE WERE TOLD TO CONTACT TWR. WE COMPLIED AND TWR CLRED US TO LAND. I (AS THE PNF) READ BACK 'CLRED TO LAND.' I CAN'T REMEMBER IF I READ BACK THE RWY NUMBER AS IS MY USUAL PRACTICE; OR IF THE TWR SPECIFIED. OUR ILS FOR RWY 27R WAS NORMAL; WITH THIS EXCEPTION: THE L-HAND FLT DIRECTOR DID NOT APPEAR TO BE OPERATING CORRECTLY. WE WERE; THEREFORE; FLYING THE ILS RWY 27R RAW DATA WITH THE DISTR OF THE ERRANT L SIDE FLT DIRECTOR. WITH THIS DISTR; I MAY NOT HAVE HEARD THE TWR'S FULL XMISSION WHEN WE WERE CLRED TO LAND. WE HAD BEEN TOLD TO EXPECT RWY 27R; CLRED FOR THE ILS RWY 27R AND; THEREFORE; HAD EVERY REASON TO EXPECT TO BE 'CLRED TO LAND RWY 27R.' RWY 26 AT PHL IS CLOSEST TO THE FBO; AND TWR MAY HAVE ASSUMED THAT WAS THE RWY WE WANTED. WE HAD REQUESTED RWY 27R BECAUSE OF OUR LNDG WT. AT THE MOMENT OF OUR GAR; THERE DID NOT APPEAR TO BE A TFC CONFLICT ON RWY 27R. AFTER LNDG; I CALLED PHL TWR TO DISCUSS OUR GAR. I WAS TOLD THERE WERE NO ISSUES FOR US TO BE CONCERNED ABOUT. I DESCRIBED THE EVENTS TO ATC AS I HAVE HERE. PHL HAS 3 PARALLEL RWYS -- RWY 27L; RWY 27R; AND RWY 26. RWY 26 IS THE USUAL GA RWY DUE TO ITS PROX TO FBO AT PHL. IN THE FUTURE; ESPECIALLY AT PHL AND OTHER ARPTS WITH PARALLEL RWYS; I WILL MAKE CERTAIN THAT WE ARE IN AGREEMENT WITH TWR AS TO OUR LNDG CLRNC. HOWEVER; I AM SURPRISED AT THE APPARENT LACK OR MISSED COM BTWN PHL APCH CTL AND PHL TWR CTL IN THIS INSTANCE. I WILL BE MORE ALERT TO THIS POSSIBILITY IN THE FUTURE.