[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR125.117]

[Page 651-652]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 125_CERTIFICATION AND OPERATIONS: AIRPLANES HAVING A SEATING 
 
              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.

[[Page 652]]

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.