Why is it crucial to inspect the exhaust system during inspections?

Inspecting the exhaust system is essential primarily to prevent leaks that could introduce carbon monoxide into the aircraft cabin. Carbon monoxide is a colorless, odorless gas that can be extremely dangerous if inhaled, as it can lead to serious health issues, including loss of consciousness or even death. Therefore, ensuring the integrity of the exhaust system is critical for the safety of both the crew and passengers.

While checking for rust and corrosion is important for the overall maintenance of the exhaust system, it is a secondary reason compared to the need to prevent harmful gas leaks. Aesthetic appearance of the engine does not impact its performance, and improvements in engine horsepower are generally unrelated to the state of the exhaust system. Thus, the primary focus during inspections should always be on safety, notably the prevention of hazardous exhaust leaks.