Landing light switch was stuck in the on position. Suspect internal arcing and welding of contacts. The overheating caused by the arc- ing can cause the switch body to melt, but did not in this case. No signs of heat damage of external switch surface were found.
Cessna 172 aircraft experienced diverse component failures across electrical, starter, ignition, fuel, and engine systems, including a stuck landing light switch, broken starter bolt, leaking fuel servo, and bad ignition harness.
More critical issues, such as a defective fuel pump (post-modification) causing repeated in-flight engine failures and a cracked cylinder head leading to immediate power loss after takeoff, highlight significant safety concerns.
Landing light switch was stuck in the “on” position. Suspect internal arcing and welding of contacts. The overheating caused by the arcing can cause the switch body to melt, but did not in this case. No signs of heat damage of external switch surface were found.
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