On the ground, how long can the EFIS tubes operate without AC power?

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Multiple Choice

On the ground, how long can the EFIS tubes operate without AC power?

Explanation:
EFIS tubes generate a lot of heat, and when AC power is removed the cooling system stops, so the displays can overheat if they run too long without ventilation. Because of this, there’s a strict safety limit on how long the tubes can operate on the ground without AC power. Five minutes is set to prevent overheating and degradation of the tubes, including the phosphor and other components. Extending beyond that window increases the risk of damage, which is why the best choice is five minutes due to cooling considerations.

EFIS tubes generate a lot of heat, and when AC power is removed the cooling system stops, so the displays can overheat if they run too long without ventilation. Because of this, there’s a strict safety limit on how long the tubes can operate on the ground without AC power. Five minutes is set to prevent overheating and degradation of the tubes, including the phosphor and other components. Extending beyond that window increases the risk of damage, which is why the best choice is five minutes due to cooling considerations.

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