When the cargo fire protection discharge is activated, how long after the first bottle does the second bottle discharge?

• A. The second bottle discharges immediately after the first
• B. The second bottle discharges slowly over about 60 minutes
• C. The second bottle remains closed
• D. The second bottle discharges during landing

Answer: (B)

Two-bottle cargo fire protection systems use staged discharge to provide rapid suppression and then extended protection. When activation occurs, the first bottle releases quickly to knock down the fire. A built-in delay triggers the second bottle, which then discharges at a slower rate for about 60 minutes, giving ongoing protection if the fire persists. This design balances immediate control with sustained coverage, rather than dumping all agent at once or not discharging the second bottle at all.