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FAR/AIM
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Federal Aviation Regulations
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PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
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Subpart J—Special Airworthiness Requirements
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§ 121.217 Internal doors.
§ 121.217 Internal doors.
In any case where internal doors are equipped with louvres or other ventilating means, there must be a means convenient to the crew for closing the flow of air through the door when necessary.