MLG FLC HAS ALTDEV ON DSCNT APCH.

Narrative

THIS RPT IS REALLY ABOUT FATIGUE RATHER THAN AN ALTDEV. THIS WAS MY 7TH CONSECUTIVE DAY OF DUTY; MY 2ND DAY OF FLYING. I WAS QUITE TIRED WHEN COMING ON DUTY AT XA45. DURING THE FLT; EVERYTHING WENT OKAY. ON THE DSCNT WE WERE GIVEN A XING RESTR AT LEESE INTXN. THE DME PORTION OF THE MCO VOR WAS OUT CAUSING SOME CONFUSION IN IDENTING THE LEESE INTXN. AFTER SWITCHING TO ORLANDO APCH; WE WERE GIVEN A DSCNT CLRNC TO 9000 FT. BOTH THE FO AND MYSELF WERE ABLE TO SEE THE ARPT AND I ASKED THE FO TO TELL APCH. AT THIS TIME I WAS PRIMED FOR A CLRNC FOR A VISUAL APCH. AFTER THE FO ADVISED APCH THAT WE HAD THE FIELD INSIGHT WE WERE GIVEN A VECTOR FOR THE DOWNWIND. I THOUGHT WE WERE ALSO CLRED FOR A VISUAL APCH. AS WE DSNDED THROUGH 8700 FT THE ALTIMETER ALERTER SOUNDED. I STOPPED THE DSCNT AND INITIATED A CLB. I DIRECTED THE FO TO ASK FOR A FURTHER DSCNT CLRNC. WE WERE GIVEN CLRNC TO 8000 FT. THERE WAS NO TFC CONFLICT. I FEEL THAT MY JUDGEMENT WAS IMPAIRED BY FATIGUE. I ALSO FEEL THAT ONE IS UNABLE TO ACCURATELY DECIDE WHEN ONE IS TOO TIRED TO FLY. I KNOW I WAS UNABLE ON THIS DAY TO TELL. IF SOME KIND OF TESTS COULD BE DEVELOPED TO HELP PLTS IDENT FATIGUE AND THE RESULTING PERFORMANCE DEGRADATION I THINK SAFETY COULD BE GREATLY ENHANCED.