AN ACR MLG CREW MISSPELLED AN INTXN INTO THEIR FMC CAUSING LTSS. COCKPIT COORD MGMNT PROB.

Narrative

DURING CLB TO FL230 CTLR GAVE RTE CHANGE 'DIRECT PERRI INTXN; J8 OTT; OTT3 ARR KBWI.' HE SPELLED OUT THE INTXN AND GAVE 230 AS AN ALT. THE CAPT BEGAN PROGRAMMING THE FMS WHILE WE BOTH REACHED FOR ENRTE CHARTS. THE CAPT LOADED 'DIRECT PERRY' AND THE COURSE INDICATED ABOUT 140 DEGS WHICH WAS REASONABLE FROM ASSIGNED 090 DEG HDG (I.E.; DID NOT APPEAR OBVIOUSLY INCORRECT). THE FMS WOULD NOT ACCEPT J8 AND WE BEGAN TO ANALYZE WHY. TCASII INDICATED TFC WHICH WAS DSNDING THROUGH OUR ALT AND A POTENTIAL CONFLICT. THE CAPT INITIATED A L TURN AND INCREASED CLB TO AVOID VISUALLY THE TFC. CTR ISSUED A 'TURN L IMMEDIATELY' AND THEN ASSIGNED 100 DEGS. THE CONFLICT POTENTIAL COULD HAVE BEEN AVERTED BY: 1) CTLR ISSUING A HDG INITIALLY UNTIL DIRECT PERRI WAS ESTABLISHED. THE POTENTIAL FOR CONFLICT EXISTED WHEN THE RTE CHANGE WAS INITIATED. 2) MY VERIFYING PERRI VERSUS PERRY AS THE FMS ENTRY. THE CTLR SPELLED OUT PERRI AND I WROTE IT DOWN CORRECTLY; BUT DID NOT VERIFY THE CAPT'S INPUT FOR SEVERAL SECONDS. THE ERROR WAS DISCOVERED BUT OVER COMS BY THE TFC CONFLICT EVENT. 3) CTLR COULD HAVE ACKNOWLEDGED TFC WITH THE RTE CHANGE XMISSION; ENSURING VISUAL CONTACT.