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

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Multiple Choice

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

Explanation:
Heat buildup in EFIS tubes during operation requires active cooling to stay within safe temperatures. On the ground, if AC power (and hence cooling) isn’t available, there isn’t sufficient means to remove that heat, so you’re limited to a short window of operation. About five minutes is the safe, recommended duration before power is restored or cooling is provided to prevent overheating of the tubes and related electronics.

Heat buildup in EFIS tubes during operation requires active cooling to stay within safe temperatures. On the ground, if AC power (and hence cooling) isn’t available, there isn’t sufficient means to remove that heat, so you’re limited to a short window of operation. About five minutes is the safe, recommended duration before power is restored or cooling is provided to prevent overheating of the tubes and related electronics.

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