CLRNC MISCOM. ALTDEV.

Narrative

NEW FO DURING IOE. FO WAS GETTING SLOW FOR ACFT'S CONFIGN. I WAS TRYING TO LET HIM GO AS FAR AS I COULD BEFORE CORRECTING HIM. I HEARD WHAT I THOUGHT WAS A CLRNC FOR US TO DSND TO 5000 FT; WE WERE ALREADY CLRED TO 6000 FT. I ACKNOWLEDGED WITH OUR CALL SIGN. THE CTLR SAID NOTHING. A MOMENT LATER THE CTLR AGAIN CLRED 'US' TO 5000 FT; THIS IS WHEN I REALIZED THAT HE WAS TALKING TO SOMEONE ELSE. I CALLED HIM AND TOLD HIM I HAD GRABBED THE WRONG CLRNC AND HAD HIM CONFIRM OUR CLRNC OF 6000 FT. THE CTLR NEVER PICKED UP ON OUR MIS-CLRNC AND SIMPLY AFFIRMED US TO 6000 FT; WHICH WE WERE ABOVE AT THE TIME. THE FO TRIED TO LEVEL AT 6000 FT; OUR ALTIMETERS WERE 100 FT APART WITH CORRECT ALT SETTING. HE USED HIS ALTIMETER AND EVENTUALLY GOT THE ACFT LEVEL AND STABLE AT 5900 FT N HIS ALTIMETER. MY ALTIMETER READ 5800 FT. I HAD HIM CORRECT TO 6000 FT ON MY ALTIMETER. NO CONFLICTS OCCURRED. THE CALL SIGN OF FLT WHO'S CLRNC I PICKED UP HAD 2 OF 3 NUMBERS WHICH WERE THE SAME AS OURS. I WAS THINKING ABOUT FLT INSTRUCTION AND NOT LISTENING LIKE I SHOULD HAVE. ALSO; I WAS ANTICIPATING A LOWER ALT CLRNC.