Carburetors

Engine lost power, causing aircraft to make an emergency landing, resulting in substantial damage. Investigation revealed microbial growth in the carburetor's fuel bowl at the drain plug area, causing blockage at the fuel channel and subsequent loss of power. This could be avoided by removing the carburetor (p/n MA3) drain plug at specified intervals and draining any moisture that may accumulate in that area.

Editorial Staff

Tuesday, August 23, 2016 at 12:00 AM ET

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Key Takeaways:

Carburetor malfunctions can lead to critical engine issues, including power loss, inability to control RPM, and fuel starvation, often necessitating emergency landings.
Recurring problems involve detached accelerator pump tubes interfering with throttle or carburetor heat operation, and microbial growth causing fuel blockages.
Other reported failures include internal component displacement (e.g., mixture control boss) and structural integrity issues leading to fuel leaks.

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Microbial Growth In Fuel Bowl
Continental O-300-A

Engine lost power, causing aircraft to make an emergency landing, resulting in substantial damage. Investigation revealed microbial growth in the carburetor’s fuel bowl at the drain plug area, causing blockage at the fuel channel and subsequent loss of power. This could be avoided by removing the carburetor (p/n MA3) drain plug at specified intervals and draining any moisture that may accumulate in that area.

Part total time: Unknown

Detached Accelerator Pump Tube
Lycoming O-360

Pilots made a precautionary landing after they were unable to retard the engine throttle below 2100 rpm. Inspection revealed the accelerator pump discharge tube detached from the boss and had become lodged between the throttle plate and the carburetor throat, inhibiting throttle movement. Scratches were observed in the carburetor’s throat consistent with the discrepancy. This carburetor (p/n 105217) was shipped with an overhauled engine directly from the manufacturer.