FO OF AN SF340 OVERSHOT FINAL DURING A VISUAL APCH TO THE R PARALLEL RWY RESULTING IN COMING IN CLOSE PROX TO ANOTHER ACFT FOR THE L PARALLEL. MEANTIME; THE CAPT TOOK OVER AND BROUGHT THE ACFT BACK TO FINAL AS THE APCH CTLR WAS ASKING THEIR INTENTIONS.

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ON JAN/XA/01; A PAX FAR PART 121 FLT (ACFT 29000 LBS) WAS BEING VECTORED FOR A VISUAL APCH INTO PIT RWY 28R. THE CAPT; (PNF) WAS IN COMMAND ASSISTED BY THE FO (PF). PLEASE NOTE THE FO IS AN INEXPERIENCED PLT. THE SIT HAPPENED AS FOLLOWAS: AFTER BEING VECTORED OVER TOP THE ARPT COMING FROM THE S TO THE N; APCH CTL VECTORED US ON A DOWNWIND. WE WERE TO EXPECT A VISUAL APCH TO RWY 28R; SIMULTANEOUS APCHS WERE BEING CONDUCTED TO THE PARALLEL RWY 28L. NOW; THE APCH CTLR GAVE US A VECTOR HDG FOR OUR BASE LEG TO THE RWY. DURING THE TURN; I SAW OUR TFC TO FOLLOW TO THE RWY (A FOKKER F100). I ASKED THE FO IF HE HAD THE TFC AND THE ARPT IN SIGHT. HIS RESPONSE WAS 'YES; I HAVE THE TFC AND RWY IN SIGHT.' AT THIS TIME I TOLD ATC 'IS OUR TFC A FOKKER AT 12 O'CLOCK POS?' ATC RESPONDED 'AFFIRMATIVE; FOLLOW THE FOKKER; CLRED FOR THE VISUAL APCH RWY 28R.' DURING OUR TURN TOWARD THE ARPT; THE SUN WAS VERY BRIGHT AND JUST ABOUT TO SET MAKING IT VERY HARD TO SEE OUR TFC. AT THIS TIME WE WERE TOLD TO SWITCH OVER TO TWR FREQ (JUST AS I WAS ABOUT TO QUERY ATC ABOUT THE TFC). I CHKED ON WITH THE TWR AND THEN REALIZED THAT THE ACFT WAS NOT IN THE POS IT WAS SUPPOSED TO BE IN. I THEN KNEW IF I DID NOT TAKE CTL OF THE ACFT WE WOULD BE IN A DISCONCERTING SIT. I SAW A TFC CONFLICT WITH AN ACR Y MD 80 (KEEP IN MIND AS PNF I AM MAINTAINING OUTSIDE VIGILANCE FOR TFC AND SINCE THE RWY IS ON THE R AND I SIT ON THE L; I CANNOT SEE THE RWY FROM MY PERSPECTIVE). I THEN TOOK CTL OF THE ACFT AWAY FROM THE FO. DURING THE EVASIVE ACTION MANEUVER; OUR TURNING RADIUS INCREASED AND BROUGHT US CLOSE ENOUGH TO THE MD80 TO GIVE US AN RA. DURING THE MANEUVER; THE TWR WAS DEMANDING TO KNOW WHAT OUR INTENTIONS WERE. I WAS THEN THE PF AND THE PNF; AND THE TWR REPEATED 2 OR 3 TIMES THE REQUEST OF 'WHAT IS YOUR INTENTION' BEFORE I COULD MANEUVER THE ACFT AND TALK ON THE RADIO. I WAS THEN SWITCHED BACK TO APCH CTL AND RECLRED FOR THE VISUAL APCH; AND I EXECUTED A NORMAL VISUAL APCH AND LNDG. IN SUMMARY; THERE WERE SEVERAL THINGS THAT LED TO THIS EVENT: 1) THE SETTING SUN MADE IF DIFFICULT TO SEE AFTER WE TURNED INTO IT. 2) A FREQ CHANGE AT A BAD TIME. 3) AN INEXPERIENCED FO UNSURE OF HIS POS. 4) HIGH TFC DENSITY; AND TFC LNDG ON PARALLEL RWY. I HOPE THAT THIS INFO IS USEFUL AND WILL HELP PREVENT SUCH SITS IN THE FUTURE.