How many PBE units are there and how long do they last once activated?

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Multiple Choice

How many PBE units are there and how long do they last once activated?

Explanation:
PBE units provide emergency breathing for the crew. The aircraft is equipped with two units, so both crew members can have access if needed. When a PBE unit is activated, it delivers breathable air for about 15 minutes. That quarter-hour duration is designed to give time to deal with smoke or fumes and, if necessary, move to a safer area or complete an evacuation.

PBE units provide emergency breathing for the crew. The aircraft is equipped with two units, so both crew members can have access if needed. When a PBE unit is activated, it delivers breathable air for about 15 minutes. That quarter-hour duration is designed to give time to deal with smoke or fumes and, if necessary, move to a safer area or complete an evacuation.

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