ACE Sustainability Sustainability All ACE exhibits were evaluated to ensure maximum sustainability at the lowest possible cost. Only exhibits with a demonstrated or predicted reliability and durability record were selected. Maintenance requirements as well as general supervision requirements were kept to a minimum. A supply of spare parts and maintenenace materials will be kept on hand for those items requiring routine maintenance or replacement. The Utah Chapter of the Aerospace Education Foundation and the Aerospace Heritage Foundation of Utah will fund the annual support costs of the ACE.