How many fire protection bottles does the APU have?

The APU, or Auxiliary Power Unit, in the Airbus A320 is equipped with one fire protection bottle. This single fire bottle is designed to extinguish any potential fire that may occur in the APU compartment. The choice of having one fire bottle is based on the design and operational requirements of the A320, providing adequate protection while keeping the system efficient and manageable.

In contrast, options suggesting multiple bottles do not align with the aircraft's design specifications for APU fire protection, which emphasize a streamlined approach that balances safety with practicality.