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.
Various Cessna 172 models experienced a range of component failures, including electrical switches, starter bolts, ignition harnesses, and critical engine and fuel system parts.
Several incidents led to serious operational safety concerns, notably two in-flight engine failures attributed to a defective fuel pump in an STC-modified aircraft, and significant power loss from a cracked cylinder.
Recurring fuel system issues, such as an underperforming fuel pump and a leaking fuel servo, highlight persistent challenges, with one servo problem being a known issue disputed by the manufacturer.
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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