During smoke removal procedures in flight, to what altitude should the aircraft descend?

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Multiple Choice

During smoke removal procedures in flight, to what altitude should the aircraft descend?

Explanation:
Smoke removal relies on rapid dilution of cabin air with outside air to purge contaminants. Descending to 15,000 feet provides the right balance between a strong fresh-air exchange through the environmental control system and keeping cabin pressurization within safe limits for the crew. At higher altitudes the outside air is thinner, slowing the purge; at much lower altitudes the purge benefits are reduced and pressurization changes become more cumbersome. So 15,000 feet is the best altitude to clear smoke efficiently while maintaining safety.

Smoke removal relies on rapid dilution of cabin air with outside air to purge contaminants. Descending to 15,000 feet provides the right balance between a strong fresh-air exchange through the environmental control system and keeping cabin pressurization within safe limits for the crew. At higher altitudes the outside air is thinner, slowing the purge; at much lower altitudes the purge benefits are reduced and pressurization changes become more cumbersome. So 15,000 feet is the best altitude to clear smoke efficiently while maintaining safety.

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