2024 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2023 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2022 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2021 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2020 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2019 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2016 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2015 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations

2014 39 CFR 254.2 – Definition of primary function area and criteria used to determine whether an alteration has an effect on an area containing a primary function that is disproportionate to the overall alterations