Baron 95-B55 was beginning a flare for landing when constant warning horn sounded. Made go around and recycled the gear. On second approach horn warning stopped at 100 ft AGL. Landing ok. Maintenance found the stall warning vane had failed.

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Attributes
ACN	366379
Time
Date	199704
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dsm
State Reference	IA
Altitude	agl bound lower : 20 agl bound upper : 100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dsm
Operator	general aviation : corporate
Make Model Name	Baron 55/Cochise
Operating Under FAR Part	Part 91
Flight Phase	descent : approach landing : go around other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 1100 flight time type : 150
ASRS Report	366379
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	aircraft : equipment problem dissipated flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On apr/thu/97, approximately AB00 local time, I was cleared to land on runway 31R at dsm from a VFR flight and in VFR conditions. When I began to flare at approximately 20 ft AGL, I heard a constant warning horn sound. I executed an immediate go around and remained in the pattern for runway 31R. I told tower it may be a possible gear warning horn, so I recycled the gear and verified a green light and a visual on the nose gear, so I continued the landing. At 100 ft AGL on final the constant warning horn sound ceased, followed by an uneventful landing. It was discovered that the stall warning vane had failed and sounded the constant warning horn, but it still is a mystery why it stopped on its own after the go around for the second landing attempt. Warning horn activation time was a total of approximately 2 mins and 30 seconds from the first indication. I was flying a 1966 baron 95-B55 model. No emergency was declared at the airport, however, the fire trucks were standing by just in case. Thank you dsm.

Original NASA ASRS Text

Title: BARON 95-B55 WAS BEGINNING A FLARE FOR LNDG WHEN CONSTANT WARNING HORN SOUNDED. MADE GAR AND RECYCLED THE GEAR. ON SECOND APCH HORN WARNING STOPPED AT 100 FT AGL. LNDG OK. MAINT FOUND THE STALL WARNING VANE HAD FAILED.

Narrative: ON APR/THU/97, APPROX AB00 LCL TIME, I WAS CLRED TO LAND ON RWY 31R AT DSM FROM A VFR FLT AND IN VFR CONDITIONS. WHEN I BEGAN TO FLARE AT APPROX 20 FT AGL, I HEARD A CONSTANT WARNING HORN SOUND. I EXECUTED AN IMMEDIATE GAR AND REMAINED IN THE PATTERN FOR RWY 31R. I TOLD TWR IT MAY BE A POSSIBLE GEAR WARNING HORN, SO I RECYCLED THE GEAR AND VERIFIED A GREEN LIGHT AND A VISUAL ON THE NOSE GEAR, SO I CONTINUED THE LNDG. AT 100 FT AGL ON FINAL THE CONSTANT WARNING HORN SOUND CEASED, FOLLOWED BY AN UNEVENTFUL LNDG. IT WAS DISCOVERED THAT THE STALL WARNING VANE HAD FAILED AND SOUNDED THE CONSTANT WARNING HORN, BUT IT STILL IS A MYSTERY WHY IT STOPPED ON ITS OWN AFTER THE GAR FOR THE SECOND LNDG ATTEMPT. WARNING HORN ACTIVATION TIME WAS A TOTAL OF APPROX 2 MINS AND 30 SECONDS FROM THE FIRST INDICATION. I WAS FLYING A 1966 BARON 95-B55 MODEL. NO EMER WAS DECLARED AT THE ARPT, HOWEVER, THE FIRE TRUCKS WERE STANDING BY JUST IN CASE. THANK YOU DSM.

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.