TCASII RA FROM ACFT ON PARALLEL RWY. DUE TO CLB; MISSED APCH EXECUTED.

Narrative

EVENT OCCURRED ON APCH TO EWR RWY 22L AT 600 FT AGL. TCASII WENT OFF AND INTO A TA AND RA MODE WITH A CLB COMMAND. I CLBED THE ACFT AND THE FO SPOTTED THE ACFT. I ELECTED TO EXECUTE A MISSED APCH; AS THE ACFT WAS TOO HIGH TO MAKE NORMAL APCH AND LNDG TO RWY 22L. DURING THE MISSED APCH PHASE; TWR GAVE ME MISSED APCH INSTRUCTIONS AND WE ACCEPTED VISUAL SEPARATION FROM A DEPARTING ACFT OFF OF RWY 22R. I BELIEVE THE SINGLE ENG ACFT WAS XYZ. THIS INFO CAME FROM LISTENING TO APCH CTL 5 MINS PRIOR. THE APCH CTLR WAS SWAMPED WITH TFC. THEY WERE WORKING AT PEAK RATE AND WERE CLOSE TO BEING OVERLOADED. XYZ WENT INTO EWR TWR AIRSPACE AND TWR WAS UNAWARE OF TFC WHEN QUESTIONED BY THIS FLC. IT SEEMS LIKELY THAT APCH CTL DID NOT ADVISE EWR TWR OF XYZ. HAD THIS CREW BEEN ADVISED OF THIS TFC BY TWR; WE COULD HAVE HAD TIME TO MANEUVER AWAY FROM XYZ AND GAINED LATERAL SEPARATION AND STILL CONTINUED THE APCH. HAD THE APCH CTLR NOT BEEN OVERLOADED HE MIGHT HAVE ADVISED US OR THE TWR CTLR. HAD EWR HAD MORE RWYS; THE APCH CTLR WOULD NOT HAVE TO S-TURN ACFT FOR SEPARATION AND WORK TWICE AS HARD. WE WERE IN GOOD POS TO EXECUTE AN APCH TO RWY 29. TWR OFFERED A VISUAL APCH TO RWY 29. WE ACCEPTED AND EXECUTED A 270 DEG MANEUVER TO RWY 29 AND LANDED. I WAS MET BY 3 FAA OFFICIALS AT GATE.