Which spark plugs are connected to the right magneto in the C172S?

In the Cessna 172S, the ignition system is designed in such a way that each magneto is responsible for energizing a specific set of spark plugs in the engine. The arrangement of the spark plugs is critical for ensuring proper engine operation and efficiency.

In this aircraft, the right magneto is connected to the upper left and lower right spark plugs. This configuration allows for redundancy because each spark plug is supplied with electrical energy from either magneto, which enhances engine reliability. By having one magneto connected to two alternating plugs, if one magneto fails, the other can still provide sufficient spark to maintain engine operation.

This design helps in maintaining balanced engine power as both magnetos will fire their respective plugs in a sequential manner during engine operation. Understanding this configuration is essential for proper ignition and ensuring the aircraft performs safely during flight operations.