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:

Microbial growth in carburetor fuel bowls can cause blockages and subsequent engine power loss, emphasizing the need for regular draining of moisture.
Detachment of the accelerator pump discharge tube can lead to throttle sticking, preventing RPM reduction, or interfere with other carburetor components.
Internal structural failures, such as a rotating mixture control boss or poor sealing between carburetor halves, can result in fuel starvation, leaks, and adverse engine performance.

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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.