Spark Plugs

Editorial Staff

Monday, December 21, 2020 at 03:25 PM ET

Verified

Key Takeaways:

Spark plug malfunctions, including high/infinite resistance, physical breakage, and cracked insulators, are a recurring issue across various aircraft types.
These failures frequently lead to adverse engine performance, such as rough running, elevated EGT/CHT, or engine shutdown, with potential for more severe internal damage.
Resistance checks are a critical diagnostic method for identifying failing spark plugs, though manufacturer-specified limits for these values can vary.

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Cessna 172N Skyhawk

High Resistance

Editorial Staff