PLT DEV; ALT OVERSHOOT.

Narrative

THE CAPT WAS FLYING; I WAS THE PNF. FOR ABOUT 30 MINS BEFOREHAND; THE CAPT WAS EXPLAINING (WITH GREAT EMOTION) HOW THE UNION HAD NOT FOUGHT HARD ENOUGH FOR A BETTER CONTRACT FOR THE PLTS DURING NEGOTIATIONS LAST SUMMER (I WAS HIRED IN DEC). WE WERE CLRED TO DSND TO 10000 FT FROM 14000 FT. I LOOKED AT THE ALT SELECTOR (THE JETSTREAM HAS NO AUTOPLT) AND NOTICED THE 'ALERT' ANNUNCIATION ILLUMINATED UNDER THE 10000 FT READOUT. THE AUDIBLE 'CHK BAROMETRIC ALT' WARNING DID NOT OCCUR (IT DIDN'T GO OFF FOR THE REST OF THE FLT; EITHER. I HAD ALWAYS CONSIDERED IT AN ANNOYANCE; NOT NOW!) ANYWAY; WE HAD DSNDED TO 9500 FT WHEN I SAID; '10000; WE'RE AT 9500; GO BACK TO 10000.' EVIDENTLY THERE WAS NO CONFLICT. WE CLBED BACK UP TO 10000 FT. THE CTLR NEVER MENTIONED THE DEV; NOR DID WE BRING IT TO HIS ATTN. ALTHOUGH THE PRIMARY CAUSE WAS SIMPLY OUR INATTN TO OUR ALT; OTHER CONTRIBUTING FACTORS MAY HAVE BEEN CONTRIBUTING; LIKE MALFUNCTIONING ALT ALERTER AND FATIGUE (WE WERE AT THE END OF A 7 LEG; 10 HR DUTY DAY; AND I WAS TIRED TO BEGIN WITH. IN ADDITION; I SKIPPED BREAKFAST AND DIDN'T HAVE TIME FOR LUNCH; SO I HADN'T EATEN IN 24 HRS).