Environmental system smoke or odor: after the crew dons oxygen masks and selects Mic to OXY MASK, the next action is to isolate the cabin pressure source by selecting L ENG or R ENG.

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Multiple Choice

Environmental system smoke or odor: after the crew dons oxygen masks and selects Mic to OXY MASK, the next action is to isolate the cabin pressure source by selecting L ENG or R ENG.

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