The airplane cabin ozone concentration during flight must be shown not to exceed—
0.25 parts per million by volume, sea level equivalent, at any time above flight level 320; and
0.1 parts per million by volume, sea level equivalent, time-weighted average during any 3-hour interval above flight level 270.
For the purpose of this section, “sea level equivalent” refers to conditions of 25 °C and 760 millimeters of mercury pressure.
Compliance with this section must be shown by analysis or tests based on airplane operational procedures and performance limitations, that demonstrate that either—
The airplane cannot be operated at an altitude which would result in cabin ozone concentrations exceeding the limits prescribed by paragraph (a) of this section; or
The airplane ventilation system, including any ozone control equipment, will maintain cabin ozone concentrations at or below the limits prescribed by paragraph (a) of this section.
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