How many Halon bottles are used by the cargo fire protection system?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

The main concept here is how the cargo fire protection system is configured to deliver extinguishing agent to the cargo compartments. Halon bottles are the source of that agent, and the number of bottles is set by design to provide enough agent and redundancy to protect the cargo zones.

In most transport aircraft, two Halon bottles are used for the cargo fire protection system. This setup ensures there is enough extinguishing agent to suppress a fire quickly and offers redundancy between the two bottles, improving reliability if one bottle doesn’t discharge as expected or is expended. A single bottle would often be insufficient for full coverage of all cargo zones, while using three or four bottles is uncommon for standard aircraft configurations. Therefore, two bottles is the typical and correct arrangement.