A fully charged battery will power the DC system for approximately how long?

• A. 15 minutes
• B. 30 minutes
• C. 45 minutes
• D. 60 minutes

Answer: (B)

The key idea is that the DC electrical system is designed to run on battery power for a limited, guaranteed duration after generator power is lost. For the MH-65E, a fully charged battery can sustain the essential DC loads for about 30 minutes. This window gives the crew time to maintain flight, complete a controlled approach or landing, and manage critical systems while generators are offline or reconfigured. Real-world duration can vary with how heavy the electrical load is and battery age or temperature, but 30 minutes is the standard expectation. Shorter times (like 15 minutes) or longer times (45–60 minutes) do not align with the system’s typical design 목표, which centers on a practical, safe emergency power interval.