Narrative:

During our approach into ZZZ; we noticed the arm light on the autofeather switch was illuminated with torques above 85%; without autofeather being selected. Upon reducing the power levers below 85%; the arm light went out. The captain; [who] was the pilot flying; decided just to leave the power below 85% for the duration of the approach and landed safely without the arm light being 'on'. Once on the ground; the captain advised maintenance control of the [logbook] write up; and ultimately decided they would deactivate the autofeather system by pulling the relays and we would ferry the plane to ZZZ1. After a maintenance engine run-up; ensuring the alternate feather system is working properly and that the autofeather system had been deactivated; we proceeded with the ferry flight. Before our takeoff roll; the captain and I decided to bring the powers up near 60% torque with the autofeather being selected (autofeather selected for takeoff was a request from maintenance control) to ensure the arm light would not come on before we performed our takeoff as an extra precaution. With both the power levers at near 60%; the arm light indeed didn't come on; which led us to believe the autofeather system was deactivated. We shortly performed our takeoff and with power levers set for takeoff; we noticed the arm light was illuminated again; we decided to reject the takeoff and consult with maintenance control about the conditions. After a joint conversation and agreement; maintenance control ensured us that the arm light might come on during our takeoff roll; but would not autofeather due to the [electrical] relays being pulled. With that reassurance; we proceeded with the takeoff with the expectation that the arm light will illuminate. We completed the flight safely with no other issue. We performed the first takeoff expecting arm [light] would not illuminate due to deactivation; but it did. System malfunction rejected takeoff (rejected takeoff) to consult with maintenance control. [Recommend] to discuss all possibility with maintenance control what we can expect before performing takeoff. Part 91. Ferry flight. Non-revenue flight.

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Original NASA ASRS Text

Title: A Captain and First Officer report about an AutoFeather 'ARM' light that illuminated on approach and later again required a Rejected Takeoff (RTO). Both pilots noted the AutoFeather System on their DHC-8-100 was selected 'OFF' during each event. The RTO was applied due to the 'ARM' light had illuminated; even though the AutoFeather System had been de-activated.

Narrative: During our approach into ZZZ; we noticed the ARM light on the autofeather switch was illuminated with torques above 85%; without autofeather being selected. Upon reducing the Power levers below 85%; the ARM light went out. The Captain; [who] was the pilot flying; decided just to leave the power below 85% for the duration of the approach and landed safely without the ARM light being 'On'. Once on the ground; the Captain advised Maintenance Control of the [logbook] write up; and ultimately decided they would deactivate the AutoFeather System by pulling the relays and we would ferry the plane to ZZZ1. After a Maintenance Engine Run-up; ensuring the Alternate Feather System is working properly and that the AutoFeather System had been deactivated; we proceeded with the ferry flight. Before our takeoff roll; the Captain and I decided to bring the powers up near 60% torque with the autofeather being selected (autofeather selected for takeoff was a request from Maintenance Control) to ensure the ARM light would not come on before we performed our takeoff as an extra precaution. With both the power levers at near 60%; the ARM light indeed didn't come on; which led us to believe the AutoFeather System was deactivated. We shortly performed our takeoff and with power levers set for takeoff; we noticed the ARM light was illuminated again; we decided to reject the takeoff and consult with Maintenance Control about the conditions. After a joint conversation and agreement; Maintenance Control ensured us that the ARM light might come on during our takeoff roll; but would not autofeather due to the [electrical] relays being pulled. With that reassurance; we proceeded with the takeoff with the expectation that the ARM light will illuminate. We completed the flight safely with no other issue. We performed the first takeoff expecting ARM [light] would not illuminate due to deactivation; but it did. System malfunction Rejected Takeoff (RTO) to consult with Maintenance Control. [Recommend] to discuss all possibility with Maintenance Control what we can expect before performing takeoff. Part 91. Ferry flight. Non-Revenue flight.

Data retrieved from NASA's ASRS site 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.