What is the allowable RPM variation between magnetos?

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The allowable RPM variation between magnetos is critical for ensuring proper ignition system function in aircraft engines. When comparing the performance of two magnetos, it is essential that their RPM readings are closely aligned to ensure reliable engine operation and to prevent issues like pre-ignition or uneven power distribution within the engine.

The correct standard for allowable RPM variation between two magnetos is no greater than 50 RPM. This means that when checking the magneto drop during engine run-up, the difference in RPM between the two magnetos should not exceed this value. A variation greater than 50 RPM indicates a potential issue with one of the magnetos, which could lead to inefficient engine performance or increased likelihood of engine failure.

Hence, the 50 RPM threshold is established as a safety measure to maintain balanced and efficient engine function. This standard supports the overall reliability and safety of aircraft operation under various conditions.

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