Section 151.71 - Applicability(a) This subpart prescribes programming and design and construction standards for projects under the Federal-Aid Airport Program to assure the most efficient use of Program funds and to assure that the most important elements of a national system of airports are provided.(b) Except for the standards made mandatory by § 151.72(a) , the standards prescribed in this subpart that apply to any particular project are those in effect on the date the sponsor accepts the Administrator's offer under § 151.29(c) . The standards of § 151.72(a) applicable to a project are those in effect on the date written on the notification of tentative allocation of funds (§ 151.21(b) ) . Standards that become effective after that date may be applied to the project by agreement between the sponsor and the Administrator.Amdt. 151-19, 32 FR 9220, June 29, 1967 Secs. 1-15, 17-21, 60 Stat. 170, 49 U.S.C. 1120