49 U.S.C. § 40111: Multiyear procurement contracts for services and related items

operation, maintenance, and support of facilities and installations. operation, maintenance, and modification of aircraft, vehicles, and other highly complex equipment. specialized training requiring high quality instructor skills, including training of pilots and aircrew members and foreign language training. base services, including ground maintenance, aircraft refueling, bus transportation, and refuse collection and disposal. there will be a continuing requirement for the service consistent with current plans for the proposed contract period; providing the service will require a substantial initial investment in plant or equipment, or will incur a substantial contingent liability for assembling, training, or transporting a specialized workforce; and the contract will promote the best interests of the United States by encouraging effective competition and promoting economies in operation. The part of the cost of a plant or equipment amortized as a cost of contract performance may not be more than the ratio between the period of contract performance and the anticipated useful commercial life (instead of physical life) of the plant or equipment, considering the location and specialized nature of the plant or equipment, obsolescence, and other similar factors. obtaining an option to renew the contract for a reasonable period of not more than 3 years, at a price that does not include charges for nonrecurring costs already amortized; and reserving in the Administrator the right, on payment of the unamortized part of the cost of the plant or equipment, to take title to the plant or equipment under appropriate circumstances. an appropriation originally available for carrying out the contract; an appropriation currently available for procuring the type of service concerned and not otherwise obligated; or amounts appropriated for payments to end the contract.