The batteries will provide uninterrupted DC emergency power for approximately how long?

The batteries will provide uninterrupted DC emergency power for approximately how long?

• A. Fifteen minutes
• B. Ten minutes
• C. Twenty minutes
• D. Thirty minutes

Answer: (A)

When electrical power is lost, the helicopter’s DC emergency power comes from the battery system and is sized to keep the essential DC buses alive for a limited time. That endurance is about 15 minutes, giving the crew enough time to conserve power, seek alternate power sources if needed, and perform a safe landing. Shorter durations like ten minutes wouldn’t give enough time for a controlled transition, while longer durations such as twenty or thirty minutes would require a much larger battery capacity than is provided.

When electrical power is lost, the helicopter’s DC emergency power comes from the battery system and is sized to keep the essential DC buses alive for a limited time. That endurance is about 15 minutes, giving the crew enough time to conserve power, seek alternate power sources if needed, and perform a safe landing.

Shorter durations like ten minutes wouldn’t give enough time for a controlled transition, while longer durations such as twenty or thirty minutes would require a much larger battery capacity than is provided.