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, encompassing electrical (landing light switch, ignition harness), mechanical (starter bolt, cylinder head), and fuel system issues (fuel pump, fuel servo).
These failures led to significant operational problems, including in-flight engine failures, power loss during takeoff, and severe vibrations.
Several critical components failed at relatively low operating hours, and a recurring fuel servo issue persisted despite following manufacturer's procedures, suggesting potential systemic problems.
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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