What is the maintenance protocol for the last chance filter in a turbine engine?

The maintenance protocol for the last chance filter in a turbine engine is to replace it only during engine tear down. This is because the last chance filter is designed to capture any particles or contaminants that may have escaped previous filtration processes. It's a critical component located in a position where it acts as a safeguard for the engine, typically filtering fluids before they enter vital engine components.

Replacing the filter only during engine tear down allows for thorough inspection and maintenance of the engine as a whole, ensuring that any potential contaminants are addressed when the engine is disassembled. This approach reduces the risks associated with contaminants lingering in the engine and provides a more comprehensive maintenance routine. Regular inspections or cleaning of the last chance filter are generally considered insufficient, as the opportunity for contamination can occur between maintenance cycles, which is why the protocol focuses on replacement during major maintenance events.