SIMILAR CALL SIGNS AND A LONG LNDG ROLL CAUSE A GAR AND CONFUSION IN THE DEP AREA AT PHX; AZ.

Narrative

DEPARTING PHX; PHX TWR CLRED ACFT X INTO POS AND HOLD AND BE READY FOR TKOF. PRIOR TO RECEIVING THE CLRNC; AN ACFT Z HAD JUST LANDED AND TOOK A LONGER THAN USUAL TIME EXITING THE RWY. TWR CLRED ACFT X FOR TKOF. DURING ACFT X TKOF ROLL; TWR INSTRUCTED ACFT Y TO GO AROUND AND PARALLEL THE RWY. DURING CLBOUT ABOUT 400-800 FT; TWR INSTRUCTED ACFT X TO TURN TO A HDG OF 220 DEGS AND MAINTAIN 4000 FT. PASSING THROUGH 240 DEGS; TWR THEN INSTRUCTED ACFT X TO TURN BACK TO A 260 DEG OR RWY HDG. ONCE ESTABLISHED ON A 260 DEG HDG; TWR SAID RESUME THE BUCKEYE DEP AND CONTACT DEP. ACFT X ORIGINALLY WAS ASSIGNED THE DRYHEAT 1 CLB AND MAINTAIN 7000 FT. ONCE WITH DEP; DEP INSTRUCTED ACFT X TO TURN TO A 240 DEG HDG; RESUME THE DRYHEAT 1 DEP; CLB AND MAINTAIN 15000 FT. THE CONTRIBUTING FACTORS TO THE PROB WERE THE ACFT Z IN ROLLOUT DID NOT EXIT THE RWY SOON ENOUGH; SIMILAR CALL SIGNS OF ACFT X AND ACFT Y; THE TWR NOT ALERTING ACFT X AND ACFT Y OF SIMILAR CALL SIGNS; AND CONFUSING HIMSELF; AMONG OTHERS. SUPPLEMENTAL INFO FROM ACN 472395: CONTRIBUTING FACTORS: SIMILAR CALL SIGN. ACFT Y HAD TO BE CLOSER THAN 8 NM FINAL. ACFT Z LONG ROLLOUT. TWR AND DEP ISSUED 2 OR MORE CLRNCS TO ACFT X THAT WERE TO WRONG ACFT. NO HEADS UP BY ATC AS TO SIMILAR CALL SIGNS. HUMAN FACTORS: WITH DRYHEAT SID THE CLRNC FOR ACFT X SEEMED REASONABLE TO CONTINUE L 20 DEGS; BEYOND 240 DEGS; AND MAINTAIN LOWER ALT OF 4000 FT VERSUS 7000 FT. SEVERAL CLRNCS WERE ISSUED IN RAPID SUCCESSION TO WRONG ACFT. FMS/MCP/TMC AUTOMATION INPUTS WERE SLOW TO BE INITIATED DUE TO VISUAL TFC SEARCH AND ATC TRANSITION AND CALL SIGN PROBS. CORRECTIVE ACTIONS: 1) ATC HAVE PLAN OF ACTION FOR MISSED APCH/GAR. 2) ATC ALERT SIMILAR CALL SIGNS. 3) ATC ISSUE ACFT #1 MAINTAIN RWY HDG CLRNC.