AN MD80 DEPARTING RWY 34 AT SEA EXPERIENCES A POTENTIAL CONFLICT WITH AN ACR FK28 WHO WAS MAINTAINING 10000 FT. THE MD80 HAD BEEN ASSIGNED THAT ALT BY CLRNC DELIVERY WITH DEP CTLR ACKNOWLEDGING THE CHK IN CLB TO 10000 FT RPT BY THE MD80 FO. TCASII PREVENTS THE INCIDENT FROM BECOMING WORSE.

Narrative

RECEIVED SUMMA 5 LKV TRANSITION FROM SEA CLRNC DELIVERY. THE ALT CLRED TO WAS READ BACK AS 10000 FT AND CLRNC ACKNOWLEDGED THE READBACK AS 'READBACK CORRECT.' AFTER TKOF I CONTACTED DEP CTL AS INSTRUCTED AND READ BACK '...OUT OF 2000 FT FOR 10000 FT.' WHEN CLBING WE RECEIVED A TA AND THEN AN RA FROM TCASII AS WE CONTINUED OUR CLB TO 10000 FT. THE CAPT RESPONDED IMMEDIATELY BY LEVELING OFF THEN DSNDING. DEP VERIFIED; WITH SEEMING UNCERTAINTY; THAT OUR ALT LIMIT WAS 9000 FT. WE LEVELED OFF AT 9000 FT AND NEVER COMING CLOSER THAN APPROX 1000 FT OF THE ACFT AT 10000 FT. IN THE FUTURE I WILL QUESTION ANY CLRNC THAT FAILS TO CONFORM TO THE NORMAL OR TYPICAL DEP CLRNC ISSUED FROM THAT FACILITY. SUPPLEMENTAL INFO FROM ACN 402906: I TURNED ON MY SPEAKER AS THE FO WAS GETTING THE CLRNC. I DID NOT HEAR ALL THE CLRNC BUT DID HEAR THE CTLR SAY 'READBACK CORRECT.' I QUESTIONED THE FACT THAT WE WERE CLRED TO 10000 FT AND HE CONFIRMED THAT WAS OUR CLRNC; AND HE HAD WRITTEN DOWN 10000 FT. WE CHKED ON FREQ AND SAID CLBING TO 10000 FT. THE CTLR ACKNOWLEDGED THE CALL. WE THEN RECEIVED A TCASII ALERT AND SAW AN ACFT AT OUR 1 O'CLOCK POS CONVERGING. WE MISSED THE OTHER ACFT BY AT LEAST 1000 FT VERTLY. I DID NOT TURN MY SPEAKER ON QUICKLY ENOUGH TO TELL FOR SURE WHAT THE CLRNC REALLY WAS; AND I PLAN TO MAKE SURE I HEAR ALL THE CLRNC FROM NOW ON. THANK YOU TCASII.