Spark Plugs

Editorial Staff

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

Verified

Key Takeaways:

Multiple aircraft models experienced various spark plug failures, including high resistance, broken plugs, and cracked insulators.
These failures led to significant engine performance issues such as rough running, elevated cylinder temperatures, RPM drops, preignition, and even engine shutdown.
Resistance checks are a common diagnostic, but inconsistencies in manufacturer specifications and test results highlight challenges in reliably identifying faulty spark plugs.

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Cessna 172N Skyhawk

High Resistance

Editorial Staff