Narrative:

During takeoff, a triple chime and audible 'autofeather' system warning were heard. The takeoff was aborted with a return to the gate. The taxi in was normal. The captain briefed the passenger and the first officer coordinated with ATC and the flight attendant. Subsequent maintenance found a fault in the autofeather arming logic. Callback conversation with reporter revealed the following information: the reporter stated the left engine did go toward feather during the takeoff roll. The reporter said the aircraft autofeather system was extensively checked with run-up checks and was then ferried to the air carrier maintenance base with the autofeather system off. The reporter said the failure was caused by a defective oil pressure sensor in the autofeather system logic.

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Original NASA ASRS Text

Title: AN EMBRAER 120 ON TKOF ROLL REJECTED THE TKOF DUE TO AN AUTOFEATHER WARNING CAUSED BY #1 ENG AUTOFEATHER SENSOR FAILURE.

Narrative: DURING TKOF, A TRIPLE CHIME AND AUDIBLE 'AUTOFEATHER' SYS WARNING WERE HEARD. THE TKOF WAS ABORTED WITH A RETURN TO THE GATE. THE TAXI IN WAS NORMAL. THE CAPT BRIEFED THE PAX AND THE FO COORDINATED WITH ATC AND THE FLT ATTENDANT. SUBSEQUENT MAINT FOUND A FAULT IN THE AUTOFEATHER ARMING LOGIC. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE L ENG DID GO TOWARD FEATHER DURING THE TKOF ROLL. THE RPTR SAID THE ACFT AUTOFEATHER SYS WAS EXTENSIVELY CHKED WITH RUN-UP CHKS AND WAS THEN FERRIED TO THE ACR MAINT BASE WITH THE AUTOFEATHER SYS OFF. THE RPTR SAID THE FAILURE WAS CAUSED BY A DEFECTIVE OIL PRESSURE SENSOR IN THE AUTOFEATHER SYS LOGIC.

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.