What is the primary purpose of the APU's exhaust system?

The primary purpose of the APU's exhaust system is to safely direct gases away from the aircraft. The Auxiliary Power Unit (APU) generates power and thermal energy, and during this process, it produces exhaust gases, which could be harmful if not properly managed. The exhaust system ensures that these gases are expelled away from the aircraft structure and the crew, maintaining safety and preventing the accumulation of toxic fumes in the vicinity of the aircraft.

This system plays a crucial role in the overall safety protocols during ground operations, as it helps prevent hazardous situations that could arise from the buildup of exhaust close to the aircraft or personnel. Proper management of these gases also protects the APU and other components of the aircraft from potential heat damage or corrosion caused by prolonged exposure to the exhaust byproducts.