Takeoff aborted after warning horn sounds. Flap sensor suspected.

Attributes
ACN	261029
Time
Date	199401
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	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 188 flight time total : 7892 flight time type : 1213
ASRS Report	261029
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

The takeoff warning horn sounded as the power was advanced for takeoff. We aborted the takeoff and taxied clear of the runway. All controls were verified to be in the correct position for a 5 degree flap takeoff. We returned to the gate and reported the occurrence to company maintenance. A local mechanic then accompanied us for a runup check during which the flaps were positioned at both the 5 degree and 15 degree takeoff settings. The takeoff warning horn did not sound with the flaps at either position, and the aircraft was approved for return to service. The warning horn was attributed to a 'nuisance trip' of the system caused by a buildup of tolerances in the flap and warning system.

Original NASA ASRS Text

Title: TKOF ABORTED AFTER WARNING HORN SOUNDS. FLAP SENSOR SUSPECTED.

Narrative: THE TKOF WARNING HORN SOUNDED AS THE PWR WAS ADVANCED FOR TKOF. WE ABORTED THE TKOF AND TAXIED CLR OF THE RWY. ALL CTLS WERE VERIFIED TO BE IN THE CORRECT POS FOR A 5 DEG FLAP TKOF. WE RETURNED TO THE GATE AND RPTED THE OCCURRENCE TO COMPANY MAINT. A LCL MECH THEN ACCOMPANIED US FOR A RUNUP CHK DURING WHICH THE FLAPS WERE POSITIONED AT BOTH THE 5 DEG AND 15 DEG TKOF SETTINGS. THE TKOF WARNING HORN DID NOT SOUND WITH THE FLAPS AT EITHER POS, AND THE ACFT WAS APPROVED FOR RETURN TO SVC. THE WARNING HORN WAS ATTRIBUTED TO A 'NUISANCE TRIP' OF THE SYS CAUSED BY A BUILDUP OF TOLERANCES IN THE FLAP AND WARNING SYS.

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.