Narrative:

We were just leveling off at our final cruising altitude of FL240 when we got a master warning flasher and an associated right firewall fuel valve illumination. The captain called for the memory items; which were performed. Upon shutting down and feathering the engine; the firewall fuel valve remained illuminated. The fire could not be confirmed visually; but because of the continued illumination of the warning system; the captain and I made the decision to activate the extinguisher. Even after the discharge; the t-handle remained illuminated. We then followed by completing the QRH emergency checklist for an engine fire or failure in flight. While completing this checklist; it was noticed that the operative engine's propeller was not full forward; so it was accomplished at that time. We declared an emergency with center; and decided to return for landing. We received priority handling for a visual approach. On approach; we briefed the passengers; completed the descent and approach checklists; and then the one engine inoperative approach and landing abnormal checklist. Approximately 2 minutes prior to landing; the fire indication finally disappeared. We made a successful landing; and were able to roll clear of the runway; where we shut down the aircraft and were met by emergency crews. Once the fire crews confirmed that there was no fire occurring; the passengers were returned to the terminal by bus and the captain and I stayed with the aircraft while it was towed into the ramp.

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Original NASA ASRS Text

Title: BE1900 First Officer experiences a Right Firewall Fuel Valve illumination at FL240. Upon shutting down and feathering the engine; the Firewall Fuel Valve remained illuminated. The extinguishing agent is discharged with no effect and the crew declares an emergency and returns to departure airport.

Narrative: We were just leveling off at our final cruising altitude of FL240 when we got a Master Warning flasher and an associated Right Firewall Fuel Valve illumination. The Captain called for the memory items; which were performed. Upon shutting down and feathering the engine; the Firewall Fuel Valve remained illuminated. The fire could not be confirmed visually; but because of the continued illumination of the warning system; the Captain and I made the decision to activate the extinguisher. Even after the discharge; the T-Handle remained illuminated. We then followed by completing the QRH Emergency checklist for an engine fire or failure in flight. While completing this checklist; it was noticed that the operative engine's propeller was not full forward; so it was accomplished at that time. We declared an emergency with Center; and decided to return for landing. We received priority handling for a visual approach. On approach; we briefed the passengers; completed the descent and approach checklists; and then the one engine inoperative approach and landing abnormal checklist. Approximately 2 minutes prior to landing; the fire indication finally disappeared. We made a successful landing; and were able to roll clear of the runway; where we shut down the aircraft and were met by emergency crews. Once the fire crews confirmed that there was no fire occurring; the passengers were returned to the terminal by bus and the Captain and I stayed with the aircraft while it was towed into the ramp.

Data retrieved from NASA's ASRS site as of April 2012 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.