Tantalum
Final Approach
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- Feb 22, 2017
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San_Diego_Pilot
Yes, I read the POH but I'm hoping some of the resident geniuses here, like maybe @Ted DuPuis can give me a more human and qualitative answer to my question
QUESTION: If Cirrus's fuel injection system has an altitude compensating mechanism than why is there a manual mixture control? CFIs have failed to give me a good answer, other than it altitude compensates and one even said that leaving in lean at 12K cruise and then descending to land at sea level is a non-event since it will automatically richen itself via the fuel control. I don't trust that enough to try it, but it made me think.
From the POH
"Engine Fuel Injection The multi-nozzle, continuous-flow fuel injection system supplies fuel for engine operation. An engine driven fuel pump draws fuel from the selected wing tank and passes it to the mixture control valve integral to the pump. The mixture control valve proportions fuel in response to the pilot operated mixture control lever position and automatically provides altitude compensation to supply the proper full rich mixture at any altitude. From the mixture control, fuel is routed to the fuel-metering valve... "
QUESTION: If Cirrus's fuel injection system has an altitude compensating mechanism than why is there a manual mixture control? CFIs have failed to give me a good answer, other than it altitude compensates and one even said that leaving in lean at 12K cruise and then descending to land at sea level is a non-event since it will automatically richen itself via the fuel control. I don't trust that enough to try it, but it made me think.
From the POH
"Engine Fuel Injection The multi-nozzle, continuous-flow fuel injection system supplies fuel for engine operation. An engine driven fuel pump draws fuel from the selected wing tank and passes it to the mixture control valve integral to the pump. The mixture control valve proportions fuel in response to the pilot operated mixture control lever position and automatically provides altitude compensation to supply the proper full rich mixture at any altitude. From the mixture control, fuel is routed to the fuel-metering valve... "