; and (2) not more than 50 percent may be allocated to another transportation capital investment account funded under this Act, on approval of the Secretary of Transportation. 227. Airport improvement program Out of funds of the Treasury not otherwise appropriated, there is appropriated to the Secretary of Transportation $200,000,000 for fiscal year 2018, to remain available until expended, to make grants under the Airport Improvement Program under subchapter I of chapter 471 of title 49, United States Code, for eligible programs and activities in Puerto Rico and the Virgin Islands. 228. Airport Facilities and Equipment Out of funds of the Treasury not otherwise appropriated, there is appropriated to the Facilities and Equipment Account of the Federal Aviation Administration $200,000,000 for fiscal year 2018, to remain available until expended, for expenses in Puerto Rico and the Virgin Islands, including expenses related to the consequences of Hurricanes Maria and Irma in Puerto Rico and the Virgin Islands. 229. Clean and safe water revolving funds Out of funds of the Treasury not otherwise appropriated, there is appropriated to the Administrator of the Environmental Protection Agency for fiscal year 2018— (1) $125,000,000, to remain available until expended, to make capitalization grants to Puerto Rico and the Virgin Islands for the purpose of establishing and maintaining water pollution control revolving funds under title VI of the Federal Water Pollution Control Act ( 33 U.S.C. 1381 et seq.)