ALTDEV ON CLB WHEN CAPT OVERSHOT ALT BY 300 FT. WHEN ALERTED BY THE FO; CAPT DSNDED TO 2500 FT INSTEAD OF THE ASSIGNED 3000 FT. RPTR SO SAYS THE CAPT APPEARED TO BE TIRED AND NOT IN THE LOOP.

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ON APR/XX/96; AT APPROX XA52 I WAS A SO ON A FLT DEPARTING FROM LAX. WE WERE CLRED TO 3000 FT. OUR CAPT WAS FLYING THE DEP AND THEY GAVE US AN AIRSPD RESTR; I BELIEVE OF 210 KTS. SINCE WE WERE ALREADY CLEAN; OUR SLATS HAD TO BE EXTENDED. I WAS TRYING TO FIX A PROB WITH OUR ACARS WHEN OUR FO SAID; 'WATCH YOUR ALT.' I LOOKED FORWARD AND WE WERE 300 FT HIGH. AFTER THE CAPT CORRECTED HIS ALT; WE WERE CLRED TO 13000 FT. I WENT BACK TO MY ACARS PROB WHEN I HEARD THE FO SAY; 'WE NEED TO CLB; WE'RE CLRED TO 13000 FT.' I SAW THAT THE CAPT HAD DSNDED TO 2500 FT. DEP CTL INSTRUCTED US TO CLB AND TO MAINTAIN 250 KTS. I FEEL THE CHANGE IN PROC; IE; HAVING TO DIRTY UP THE ACFT ON CLBOUT FOR OUR SPD RESTR AND MY SET OF EYEBALLS NOT BEING IN THE FORWARD SECTION OF THE COCKPIT ARE PARTLY TO BLAME. ALSO; WHEN I MET THE CAPT FOR BRIEF BEFORE THE FLT; HE SEEMED KIND OF 'OUT OF IT;' LIKE HIS REST WAS OR HAD NOT BEEN ADEQUATE. I LEARNED A LESSON I WILL NOT FORGET. KEEP THE EYES FORWARD UNTIL OUT OF THE TERMINAL ENVIRONMENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK TO RPTR SO WAS MADE PRIMARILY BECAUSE THE SO HAD NOT INCLUDED HIS ADDRESS ON THE IDENT STRIP. THE SENTENCE ABOUT THE SLATS HAD TO BE 'RETRACTED;' WAS NOT WHAT RPTR MEANT. HE MEANT EXTENDED; WHICH HAS BEEN CHANGED. ALSO; THE COMMENT REGARDING THE CAPT BEING 'KIND OF OUT OF IT' WAS QUESTIONED. HE SAYS THE CAPT APPEARED TO BE FATIGUED OR NOT FUNCTIONING UP TO SPD AND THAT THE FO HAD TO CONSTANTLY MONITOR THE FLYING PERFORMANCE.