BE1900D. ACFT EQUIP PROB. CONTINUOUS FALSE STALL WARNING. RPTR STATES IT OCCURS IN SUBJECT ACFT MANY TIMES AFTER THE ACFT HAS BEEN DEICED.

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ARRIVED AT ITH AT APPROX XX50 TO ACCOMPLISH RUN-UP ON BE1900D BEFORE FIRST LEG OF SCHEDULED COMMUTER SHIFT. THERE WAS APPROX 3 INCHES NEW; DRY; LOOSE SNOW ON ACFT AND GND. TEMP WAS -7 DEGS C WITH NO PRECIPITATION FALLING. AFTER DEICING; BOTH ENGS WERE STARTED. THE STALL WARNING HORN HEAT (14V ON GND; 28V AIRBORNE) WAS TURNED ON IN THE AFTER START CHKLIST BEFORE TAXI AND WAS ON GREATER THAN OR EQUAL TO 3 MINS BEFORE TKOF ROLL. THE FO MADE THE TKOF AND THE EXTREMELY LOUD STALL WARNING HORN ACTIVATED CONTINUOUSLY AT LIFT-OFF. ACFT CTL WAS TRANSFERRED TO THE CAPT DURING CLB AND THE FO PULLED THE STALL WARNING HORN CIRCUIT BREAKER. AFTER LEVEL OFF APPROX 5 MINS LATER; THE CIRCUIT BREAKER WAS PUSHED BACK IN; THE STALL WARNING HORN ACTIVATED AGAIN; AND THE CIRCUIT BREAKER WAS IMMEDIATELY PULLED BACK OUT. ABOUT 5 MINS AFTER INITIAL CRUISE; THE CIRCUIT BREAKER WAS AGAIN PUSHED BACK IN WITH NO STALL WARNING HORN. NO DEICING WAS DONE THE REMAINDER OF THE 7 LEGS OF THE SHIFT WITH THE SAME ACFT AND NO FURTHER PROBS WERE EXPERIENCED WITH THE STALL WARNING HORN. MANY; MANY OTHER BE1900D PLTS HAVE EXPERIENCED THE SAME PROB AFTER DEICING. MY FO SAID IT HAS OCCURRED TO HIM 3 OTHER TIMES. THE BE1900D STALL WARNING HORN SYS APPEARS TO NEED REDESIGN OR REPLACEMENT WITH ANOTHER SYS. THE FALSE STALL WARNING HORN IS SO LOUD THAT COM BTWN THE FO AND CAPT IS HIGHLY DIFFICULT. PERHAPS AN AUDIO LEVEL CTL SWITCH TO DIMINISH THE VOLUME WOULD HELP.