Narrative:

While conducting a training flight at dhn, al, this writer induced a simulated power plant failure after V1 speed. At 1500' power was reapplied to the right engine but at 40 percent torque the right engine tried to automatic coarsen, indicated by fluctuating torque. Realizing that I had failed to turn the automatic coarsen off, a standard procedure when simulating engine failure, I again pulled power on the right engine back to flight idle. Before I could turn off the automatic coarsen computer, the right propeller went to full automatic coarsen indicated by torque of zero percent and the propeller at 300 RPM. I was concerned with the possibility of an over torque if I turned off the computer. I was about 3 mi from the airport VFR in VMC conditions so I elected to shut down the right engine and land single engine. After an uneventful landing I have subsequently learned that a maintenance modification to the automatic coarsen system that had been reported disabled as per service bulletin had not been disabled on this aircraft causing or contributing to this incident.

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Original NASA ASRS Text

Title: COMMUTER LTT ON TRAINING FLT SELF INDUCES PROPELLER ENGINE PROBLEM, INITIATES SHUTDOWN AND EMERGENCY LNDG. THIS REPORT ILLUSTRATES THE DANGERS OF LESS THAN QUALIFIED FLT TRAINING.

Narrative: WHILE CONDUCTING A TRNING FLT AT DHN, AL, THIS WRITER INDUCED A SIMULATED PWR PLANT FAILURE AFTER V1 SPD. AT 1500' PWR WAS REAPPLIED TO THE R ENG BUT AT 40 PERCENT TORQUE THE R ENG TRIED TO AUTO COARSEN, INDICATED BY FLUCTUATING TORQUE. REALIZING THAT I HAD FAILED TO TURN THE AUTO COARSEN OFF, A STANDARD PROC WHEN SIMULATING ENG FAILURE, I AGAIN PULLED PWR ON THE R ENG BACK TO FLT IDLE. BEFORE I COULD TURN OFF THE AUTO COARSEN COMPUTER, THE R PROP WENT TO FULL AUTO COARSEN INDICATED BY TORQUE OF ZERO PERCENT AND THE PROP AT 300 RPM. I WAS CONCERNED WITH THE POSSIBILITY OF AN OVER TORQUE IF I TURNED OFF THE COMPUTER. I WAS ABOUT 3 MI FROM THE ARPT VFR IN VMC CONDITIONS SO I ELECTED TO SHUT DOWN THE R ENG AND LAND SINGLE ENG. AFTER AN UNEVENTFUL LNDG I HAVE SUBSEQUENTLY LEARNED THAT A MAINT MODIFICATION TO THE AUTO COARSEN SYS THAT HAD BEEN RPTED DISABLED AS PER SVC BULLETIN HAD NOT BEEN DISABLED ON THIS ACFT CAUSING OR CONTRIBUTING TO THIS INCIDENT.

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.