False takeoff warning horn causes slow speed abort.

Attributes
ACN	239182
Time
Date	199304
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pit
State Reference	PA
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 Large Transport, Low Wing, 2 Turbojet Eng
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 : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 20000 flight time type : 8000
ASRS Report	239182
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Takeoff warning horn sounded when throttles advanced for takeoff. Cleared runway, checked confign. Trim was in green band 4.4 units -- flaps 5 degrees -- spdbrake handle down. Rechked warning horn. Did not sound this time. Placed flaps at 1 degree takeoff, horn sounded. Placed flaps at 5 degrees, no horn. Made normal takeoff. Callback conversation with reporter revealed the following information: reporter was flying the model medium large transport in which a 1 degree flap takeoff is not permitted. The horn should sound with 1 degree of flap selected. He did this too make sure the horn was still working. The report was filed because he believes he must cya every time his aircraft leaves the runway on takeoff, that is, when he really doesn't think he aborted the takeoff.

Original NASA ASRS Text

Title: FALSE TKOF WARNING HORN CAUSES SLOW SPD ABORT.

Narrative: TKOF WARNING HORN SOUNDED WHEN THROTTLES ADVANCED FOR TKOF. CLRED RWY, CHKED CONFIGN. TRIM WAS IN GREEN BAND 4.4 UNITS -- FLAPS 5 DEGS -- SPDBRAKE HANDLE DOWN. RECHKED WARNING HORN. DID NOT SOUND THIS TIME. PLACED FLAPS AT 1 DEG TKOF, HORN SOUNDED. PLACED FLAPS AT 5 DEGS, NO HORN. MADE NORMAL TKOF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS FLYING THE MODEL MLG IN WHICH A 1 DEG FLAP TKOF IS NOT PERMITTED. THE HORN SHOULD SOUND WITH 1 DEG OF FLAP SELECTED. HE DID THIS TOO MAKE SURE THE HORN WAS STILL WORKING. THE RPT WAS FILED BECAUSE HE BELIEVES HE MUST CYA EVERY TIME HIS ACFT LEAVES THE RWY ON TKOF, THAT IS, WHEN HE REALLY DOESN'T THINK HE ABORTED THE TKOF.

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.