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 various electrical and mechanical failures, including a stuck landing light switch, a broken starter mounting bolt, and a failed ignition harness.
Critical engine component failures led to serious incidents, such as a cracked cylinder head causing power loss and vibration, and a defective fuel pump resulting in two in-flight engine failures.
Fuel system issues were prominent, with a newly installed fuel pump unable to provide adequate flow post-modification, and recurring problems with leaking fuel servos despite adherence to manufacturer procedures.
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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