Why is an exhaust system failure particularly hazardous?

An exhaust system failure is particularly hazardous primarily because it can lead to fire and carbon monoxide poisoning. When an exhaust system is compromised, exhaust gases that contain harmful substances, including carbon monoxide, can leak into the cabin of the aircraft instead of being expelled safely outside. Carbon monoxide is a colorless, odorless gas that can cause serious health issues, including loss of consciousness and even death, if inhaled in sufficient quantities.

Additionally, a failure in the exhaust system creates the risk of excessive heat build-up, which can ignite flammable materials in proximity to the exhaust system, leading to a fire hazard. This combination of risks makes an exhaust system failure especially critical to address promptly in aviation safety to protect both the crew and passengers from potentially life-threatening situations.