BE1900D. Aircraft equipment problem. Continuous false stall warning. Reporter states it occurs in su...

Attributes
ACN	361414
Time
Date	199702
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ith
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tower : avp
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : intermediate altitude climbout : initial
Route In Use	enroute airway : n90
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 7400 flight time type : 4100
ASRS Report	361414
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Arrived at ith at approximately XX50 to accomplish run-up on BE1900D before first leg of scheduled commuter shift. There was approximately 3 inches new, dry, loose snow on aircraft and ground. Temperature was -7 degrees C with no precipitation falling. After deicing, both engines were started. The stall warning horn heat (14V on ground, 28V airborne) was turned on in the after start checklist before taxi and was on greater than or equal to 3 mins before takeoff roll. The first officer made the takeoff and the extremely loud stall warning horn activated continuously at lift-off. Aircraft control was transferred to the captain during climb and the first officer pulled the stall warning horn circuit breaker. After level off approximately 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 aircraft and no further problems were experienced with the stall warning horn. Many, many other BE1900D pilots have experienced the same problem after deicing. My first officer said it has occurred to him 3 other times. The BE1900D stall warning horn system appears to need redesign or replacement with another system. The false stall warning horn is so loud that communication between the first officer and captain is highly difficult. Perhaps an audio level control switch to diminish the volume would help.

Original NASA ASRS Text

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

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

BE1900D. Aircraft equipment problem. Continuous false stall warning. Reporter states it occurs in subject aircraft many times after the aircraft has been deiced.