Air carrier mdt takeoff abort because of an unidented warning horn at start of takeoff.

Attributes
ACN	198800
Time
Date	199201
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : orh
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 7800 flight time type : 500
ASRS Report	198800
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 8500 flight time type : 300
ASRS Report	198280
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During a taxi out for takeoff on runway 33 at orh, a back taxi downwind was required. The winds were gusty and variable in direction from west to northwest. All checklists were completed. During the takeoff roll, after takeoff power had been set between 60-80 KTS, a high pitch intermittent horn sounded. I felt it was the stall vane but with the short runway I chose the conservative approach, also the lack of a stick shaker confused me. All engine parameters were normal. We told the tower that we had an aural warning. A taxi back to the gate and subsequent telephone conversations with dispatch and maintenance control personnel concluded that the horn was caused by the abnormal position of one of the angle attack vanes which resulted from the downwind taxi. Both angle of attack vanes were at normal position prior to our second taxi out and no further problems were encountered.

Original NASA ASRS Text

Title: ACR MDT TKOF ABORT BECAUSE OF AN UNIDENTED WARNING HORN AT START OF TKOF.

Narrative: DURING A TAXI OUT FOR TKOF ON RWY 33 AT ORH, A BACK TAXI DOWNWIND WAS REQUIRED. THE WINDS WERE GUSTY AND VARIABLE IN DIRECTION FROM W TO NW. ALL CHKLISTS WERE COMPLETED. DURING THE TKOF ROLL, AFTER TKOF PWR HAD BEEN SET BTWN 60-80 KTS, A HIGH PITCH INTERMITTENT HORN SOUNDED. I FELT IT WAS THE STALL VANE BUT WITH THE SHORT RWY I CHOSE THE CONSERVATIVE APCH, ALSO THE LACK OF A STICK SHAKER CONFUSED ME. ALL ENG PARAMETERS WERE NORMAL. WE TOLD THE TWR THAT WE HAD AN AURAL WARNING. A TAXI BACK TO THE GATE AND SUBSEQUENT TELEPHONE CONVERSATIONS WITH DISPATCH AND MAINT CTL PERSONNEL CONCLUDED THAT THE HORN WAS CAUSED BY THE ABNORMAL POS OF ONE OF THE ANGLE ATTACK VANES WHICH RESULTED FROM THE DOWNWIND TAXI. BOTH ANGLE OF ATTACK VANES WERE AT NORMAL POS PRIOR TO OUR SECOND TAXI OUT AND NO FURTHER PROBLEMS WERE ENCOUNTERED.

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.