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Questions and Answers
What is the primary purpose of the magneto check?
What is the primary purpose of the magneto check?
- To advance timing beyond specifications
- To compare individual right and left magneto performance (correct)
- To investigate the cause of rough engine running
- To determine the RPM drop on single ignition
What should be the cause for suspicion when an engine does not exhibit RPM drop on single ignition?
What should be the cause for suspicion when an engine does not exhibit RPM drop on single ignition?
- Magnetos are not functioning properly
- Magneto timing has been set in advance of specifications (correct)
- Airport altitude is too high
- Humidity is too low
What is a natural characteristic of dual ignition design?
What is a natural characteristic of dual ignition design?
- Reduced engine roughness
- RPM drop on single ignition (correct)
- RPM increase on single ignition
- Improved engine performance at high altitudes
Why should magneto checks be performed on a comparative basis?
Why should magneto checks be performed on a comparative basis?
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What is NOT a factor influencing RPM drop on single ignition?
What is NOT a factor influencing RPM drop on single ignition?
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Study Notes
Magneto Timing
- Never advance timing beyond specifications to reduce RPM drop on single ignition, as it is an erroneous practice.
- RPM drop on single ignition is a natural characteristic of dual ignition design and should not be overemphasized.
Magneto Check
- The purpose of the magneto check is to determine if all cylinders are firing.
- If all cylinders are not firing, the engine will run extremely rough, making it apparent that investigation is needed.
- Factors that can influence RPM drop include:
- Ambient air temperature
- Humidity
- Airport altitude
- Absence of RPM drop can be a sign that the magneto timing has been set in advance of the specified setting.
- Magneto checks should be performed by comparing the performance of individual right and left magnetos.
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Description
Learn about the importance of magneto timing and checking in aircraft engine maintenance, including common mistakes to avoid and identifying issues with cylinder firing.
