What availability timeframe is critical for emergency lighting operation post battery support?

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The correct availability timeframe for emergency lighting operation post battery support is 12 minutes. This duration is significant because it ensures that emergency lighting will remain operational long enough to assist crew members and passengers during critical situations, such as during an evacuation or if a power loss occurs.

Emergency lighting systems are designed to provide sufficient illumination to safely guide people to exits and other safety equipment, ensuring that individuals can navigate without panic in low-visibility conditions. The 12 minutes of operational time is a standard that balances the need for light with the requirements for battery size and weight, providing an efficient solution without compromising safety protocols in the aircraft's design.

The other timeframes listed, while they might seem reasonable, do not align with the established standard for emergency lighting systems on the A320, which specifically mandates 12 minutes of functionality after the loss of primary power.

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