A SW2 FLT CREW INADVERTENTLY LAND ON RWY 8 WHILE BEING CLRED TO LAND ON RWY 7L AT PHX.

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AT ABOUT XA45 WE FOUND THAT OUR PLANE HAD BEEN OVER-FUELED FOR OUR XB30 FLT FROM PHX TO SLC. WE WERE INSTRUCTED BY OUR COMPANY TO FLY THE EXCESS FUEL OFF. WE FLEW VFR FROM PHX TO THE DRAKE VOR; HELD FOR 3 TURNS; AND RETURNED TO PHX. WE CHKED ON PHX APCH AT ABOUT 35 MI TO THE NW AT 10500 FT WITH OUR DSCNT CHKLIST COMPLETE. APCH INSTRUCTED US TO DSND TO 8000 FT AND FLY DIRECT TO THE ARPT FOR A BASE TO RWY 7R. NORMALLY ON OUR IFR FLT PLAN WE'RE SENT OUT TO THE OM. THIS WOULD BE A MUCH SHORTER APCH. PROBABLY INSIDE 2 MI. BEFORE GOING TO TWR; I LOADED THE RWY 7R APCH INTO THE GPS. SINCE WE USUALLY LAND TO THE W; I WAS GOING TO USE THE GPS MAP FOR SITUATIONAL AWARENESS. I FELT A LITTLE UNCOMFORTABLE WITH THE LACK OF LANDMARKS WE HAD ON THIS SIDE OF THE FIELD. SHORTLY AFTER GOING TO TWR; ABOUT 2 MI OUT; WE WERE SWITCHED TO RWY 7L AND CLRED TO LAND. SINCE WE SWITCHED RWYS; I CHOSE NOT TO ACTIVATE APCH MODE ON THE GPS SINCE IT HAD THE WRONG APCH AND WE WERE CLOSE. I IDENTED WHAT I THOUGHT WAS RWY 7L; TXWY F AND RWY 7R; COMPLETED THE LNDG CHKLIST; AND STARTED A TURN TO FINAL. AT THAT TIME THE COPLT CONFIRMED WITH TWR WE WERE CLRED TO LAND RWY 7L. AFTER LNDG; THE TWR INFORMED US THAT WE HAD LANDED ON RWY 8 WHILE CLRED FOR RWY 7L. WE WERE INSTRUCTED TO CALL THE TWR. I CALLED THE TWR; APOLOGIZED AND GAVE THEM MY PHONE NUMBER. CONCLUSIONS: 1) I SHOULD NOT HAVE ACCEPTED A SHORT APCH TO AN UNFAMILIAR RWY. 2) I SHOULD HAVE USED MY FO AND NAVAIDS TO CONFIRM RWY ALIGNMENT. SUPPLEMENTAL INFO FROM ACN 624977: WE THEN WERE INSTRUCTED BY OUR FLT OPS DEPT TO TAKE THE PLANE UP TO BURN THE NECESSARY FUEL TO ALLOW US TO TAKE OFF FROM PHX WITH OUR NORMAL CARGO LOAD. WITH THIS SAID; WE THEN DEPARTED TO THE S OF PHX AND FLEW APPROX FOR 1 HR AND THEN PROCEEDED BACK TO PHX VFR. WE NORMALLY FLY IFR IN AND OUT OF PHX SO FOR US IT WAS OUT OF OUR NORMAL FLOW TO BEGIN WITH. ON ABOUT A 1/2 MI BASE LEG FOR RWY 7R WE WERE INSTRUCTED TO CHANGE RWYS AND LAND RWY 7L. WE WERE APPROX 2 MI OUT AND PROCEEDED TO LAND ON THE RWY THAT WE THOUGHT WAS RWY 7L AND INSTEAD LANDED ON RWY 8. WE WERE INSTRUCTED TO CONTACT 'A SPECIAL PHONE NUMBER.' WE WERE ALSO TOLD THAT THEY WERE GOING TO REVIEW THE TAPES AND GET BACK TO US BY DAY'S END AND TELL US IF ANY FURTHER ACTION WAS GOING TO TAKE PLACE. WE WERE TOLD THAT THE INCIDENT WAS RPTED TO THE LCL FSDO WHO WOULD DETERMINE WHAT THE OUTCOME WOULD BE.