[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR125.117]

[Page 990]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
 PART 125_CERTIFICATION AND OPERATIONS: AIRPLANES HAVING A SEATING CAPACITY OF 
 
              Subpart E_Special Airworthiness Requirements
 
Sec. 125.117  Ventilation.

    Each passenger or crew compartment must be suitably ventilated. 
Carbon monoxide concentration may not be more than one part in 20,000 
parts of air, and fuel fumes may not be present. In any case where 
partitions between compartments have louvres or other means allowing air 
to flow between compartments, there must be a means convenient to the 
crew for closing the flow of air through the partitions when necessary.