Narrative:

Returned to clt for malfunctioning stall warning system. After flap/slat retraction, stall warning light and horn (captain's side only) came on without stickshakers. Stall indication failure and windshear inoperative lights also illuminated. Followed stall indication failure procedure in pilot handbook. Warning lights (flashing stall and overhead warnings) remained on with horn for approximately 10 mins even with circuit breakers pulled. Elected to return to clt. No emergency declared. Flight attendants verbally briefed and passenger advised by PA. Cabin not prepared for emergency landing situation (not deemed necessary). Stall light and horn eventually went out (progressively grew weaker and appeared to have failed due to excessive use). However, both reilluminated and sounded for approximately 3-4 mins during descent to clt then ceased prior to confign for landing and remained out for approach, landing and taxi to gate. Stall computer circuit breakers reset prior to landing for stickshaker capability. After landing, tower advised crew that emergency was terminated although none declared by crew. No emergency vehicles noted on airfield. Good current noted on both 'left and right stall' when selected on pitot static anti-ice meter. Problem possibly due to angle of attack vane position or electrical circuitry, but these are only guesses. Callback conversation with reporter revealed the following information: the reporter stated that after landing the crew was sent to a replacement aircraft and departed clt before the stall warning was repaired so the reporter does not have knowledge of what maintenance action was taken. The reporter said that all of the stall warning lights and aural warning was on the captain's #1 side only.

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Original NASA ASRS Text

Title: A DC9 ON INITIAL CLB AT 1500 FT DIVERTED DUE TO STALL WARNING LIGHTS AND HORN ON THE CAPT'S #1 SIDE WITH NO STICK SHAKER, CAUSE UNKNOWN. FO'S #2 SIDE REMAINED NORMAL.

Narrative: RETURNED TO CLT FOR MALFUNCTIONING STALL WARNING SYS. AFTER FLAP/SLAT RETRACTION, STALL WARNING LIGHT AND HORN (CAPT'S SIDE ONLY) CAME ON WITHOUT STICKSHAKERS. STALL INDICATION FAILURE AND WINDSHEAR INOP LIGHTS ALSO ILLUMINATED. FOLLOWED STALL INDICATION FAILURE PROC IN PLT HANDBOOK. WARNING LIGHTS (FLASHING STALL AND OVERHEAD WARNINGS) REMAINED ON WITH HORN FOR APPROX 10 MINS EVEN WITH CIRCUIT BREAKERS PULLED. ELECTED TO RETURN TO CLT. NO EMER DECLARED. FLT ATTENDANTS VERBALLY BRIEFED AND PAX ADVISED BY PA. CABIN NOT PREPARED FOR EMER LNDG SIT (NOT DEEMED NECESSARY). STALL LIGHT AND HORN EVENTUALLY WENT OUT (PROGRESSIVELY GREW WEAKER AND APPEARED TO HAVE FAILED DUE TO EXCESSIVE USE). HOWEVER, BOTH REILLUMINATED AND SOUNDED FOR APPROX 3-4 MINS DURING DSCNT TO CLT THEN CEASED PRIOR TO CONFIGN FOR LNDG AND REMAINED OUT FOR APCH, LNDG AND TAXI TO GATE. STALL COMPUTER CIRCUIT BREAKERS RESET PRIOR TO LNDG FOR STICKSHAKER CAPABILITY. AFTER LNDG, TWR ADVISED CREW THAT EMER WAS TERMINATED ALTHOUGH NONE DECLARED BY CREW. NO EMER VEHICLES NOTED ON AIRFIELD. GOOD CURRENT NOTED ON BOTH 'L AND R STALL' WHEN SELECTED ON PITOT STATIC ANTI-ICE METER. PROB POSSIBLY DUE TO ANGLE OF ATTACK VANE POS OR ELECTRICAL CIRCUITRY, BUT THESE ARE ONLY GUESSES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT AFTER LNDG THE CREW WAS SENT TO A REPLACEMENT ACFT AND DEPARTED CLT BEFORE THE STALL WARNING WAS REPAIRED SO THE RPTR DOES NOT HAVE KNOWLEDGE OF WHAT MAINT ACTION WAS TAKEN. THE RPTR SAID THAT ALL OF THE STALL WARNING LIGHTS AND AURAL WARNING WAS ON THE CAPT'S #1 SIDE ONLY.

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.