Narrative:

I was cleared for the ILS approach into ZZZ. The conditions were IMC and outside air temperature near freezing. The aircraft turbine engine lost power. I declared an emergency to ATC. I applied the alternate induction and intake anti-icing system and unsuccessfully attempted to restart the turbine. Losing altitude at a high rate I feathered the propeller and established best glide speed. A second attempt to restart was successful. I re-established altitude and position to complete the approach.on the ground when reviewing the potential causes I called the [turbine engine conversion] company to review the flameout occurrence. The procedure when flying in visual moisture and near freezing temperatures is to have the alternate induction open and the intake anti-icing on. Because I was not seeing any ice formation on the airframe I didn't activate the procedure. The company representative reminded me that activation of the system should be applied when outside air temperatures get down to 40 degrees fahrenheit.the flame out most likely occurred due to disruption of airflow into the turbine compressor inlet due to ice formation. This occurred because I did not have the alternate induction open and the intake anti-icing on. On previous occasions in nearly the same conditions I successfully completed the flights with no indication of adverse turbine operation. The procedure for activation of the anti-icing system was covered in the initial aircraft training I received. I had not recalled the call out for the activation of the system in temperatures as high as 40 degrees until I reviewed the event with the company representative. I hadn't employed the system prior to this event.I now employ the system as specified by the company's procedure.

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Original NASA ASRS Text

Title: The pilot of turbine engine converted Cessna 207 suffered a flame out in IMC while on an ILS approach. After declaring an emergency he was able to restart the engine and complete the approach and landing.

Narrative: I was cleared for the ILS approach into ZZZ. The conditions were IMC and outside air temperature near freezing. The aircraft turbine engine lost power. I declared an emergency to ATC. I applied the alternate induction and intake anti-icing system and unsuccessfully attempted to restart the turbine. Losing altitude at a high rate I feathered the propeller and established best glide speed. A second attempt to restart was successful. I re-established altitude and position to complete the approach.On the ground when reviewing the potential causes I called the [turbine engine conversion] Company to review the flameout occurrence. The procedure when flying in visual moisture and near freezing temperatures is to have the alternate induction open and the intake anti-icing on. Because I was not seeing any ice formation on the airframe I didn't activate the procedure. The Company representative reminded me that activation of the system should be applied when outside air temperatures get down to 40 degrees Fahrenheit.The flame out most likely occurred due to disruption of airflow into the turbine compressor inlet due to ice formation. This occurred because I did not have the alternate induction open and the intake anti-icing on. On previous occasions in nearly the same conditions I successfully completed the flights with no indication of adverse turbine operation. The procedure for activation of the anti-icing system was covered in the initial aircraft training I received. I had not recalled the call out for the activation of the system in temperatures as high as 40 degrees until I reviewed the event with the Company representative. I hadn't employed the system prior to this event.I now employ the system as specified by the company's procedure.

Data retrieved from NASA's ASRS site as of July 2013 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.