Aircraft battery must be replaced if the voltage falls below what value?

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Multiple Choice

Aircraft battery must be replaced if the voltage falls below what value?

Explanation:
In a 24V DC aircraft electrical system, battery voltage reflects remaining capacity and the ability to deliver current for starts and avionics. A healthy, fully charged battery sits near 24 V, and voltage drops as the battery discharges. When the voltage falls to about 22 V, the battery is considered discharged enough that it may not reliably supply power, increasing the risk of an unreliable start or loss of essential systems and accelerating further degradation from deep discharge. Therefore, replacing the battery at or below 22 VDC keeps the electrical system safe and reliable. Values like 24 V indicate a full charge, 26 V suggests overcharging or a charging fault, and 18 V indicates a much deeper discharge that has already stressed the battery.

In a 24V DC aircraft electrical system, battery voltage reflects remaining capacity and the ability to deliver current for starts and avionics. A healthy, fully charged battery sits near 24 V, and voltage drops as the battery discharges. When the voltage falls to about 22 V, the battery is considered discharged enough that it may not reliably supply power, increasing the risk of an unreliable start or loss of essential systems and accelerating further degradation from deep discharge. Therefore, replacing the battery at or below 22 VDC keeps the electrical system safe and reliable. Values like 24 V indicate a full charge, 26 V suggests overcharging or a charging fault, and 18 V indicates a much deeper discharge that has already stressed the battery.

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