When airport owners or sponsors, planning agencies, or other organizations accept funds from FAA$-$administered airport financial assistance programs, they must agree to certain obligations or assurances. These obligations require the recipients to maintain and operate their facilities safely and efficiently and in accordance with specified conditions. The assurances may be attached to the application or the grant for federal assistance and become part of the final grant offer or in restrictive covenants to property deeds. The duration of these obligations depends on the type of recipient, the useful life of the facility being developed, and other conditions stipulated in the assurances.