How many fire bottles are included in the APU fire protection system?

The APU (Auxiliary Power Unit) fire protection system is equipped with one fire bottle. This design is intentional, as the APU generally operates in a more contained environment compared to the main engines, and the fire protection requirements can be met effectively with a single fire suppression system.

This bottle is typically filled with a fire-extinguishing agent, such as halon, which is specifically chosen for its effectiveness in suppressing fires without causing additional damage to sensitive equipment. The sole fire bottle can be activated automatically or manually, depending on the fire detection system's indications.

Understanding the number of fire bottles in the APU system is crucial for maintenance and safety protocols, ensuring that appropriate measures are in place for rapid response in the event of a fire.