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FAR 21.181 - Duration(a) Unless sooner surrendered, suspended, revoked, or a termination date is otherwise established by the Administrator, airworthiness certificates are effective as follows: (1) Standard airworthiness certificates, special airworthiness certificates—primary category, and airworthiness certificates issued for restricted or limited category aircraft are effective as long as the maintenance, preventive maintenance, and alterations are performed in accordance with Parts 43 and 91 of this chapter and the aircraft are registered in the United States. (2) A special flight permit is effective for the period of time specified in the permit. (3) A special airworthiness certificate in the light-sport category is effective as long as— (i) The aircraft meets the definition of a light-sport aircraft; (ii) The aircraft conforms to its original configuration, except for those alterations performed in accordance with an applicable consensus standard and authorized by the aircraft's manufacturer or a person acceptable to the FAA; (iii) The aircraft has no unsafe condition and is not likely to develop an unsafe condition; and (iv) The aircraft is registered in the United States. (4) An experimental certificate for research and development, showing compliance with regulations, crew training, or market surveys is effective for 1 year after the date of issue or renewal unless the FAA prescribes a shorter period. The duration of an experimental certificate issued for operating amateur-built aircraft, exhibition, air-racing, operating primary kit-built aircraft, or operating light-sport aircraft is unlimited, unless the FAA establishes a specific period for good cause. (b) The owner, operator, or bailee of the aircraft shall, upon request, make it available for inspection by the Administrator. (c) Upon suspension, revocation, or termination by order of the Administrator of an airworthiness certificate, the owner, operator, or bailee of an aircraft shall, upon request, surrender the certificate to the Administrator. [Amdt. 21–21, 33 FR 6858, May 7, 1968, as amended by Amdt. 21–49, 44 FR 46781, Aug. 9, 1979; Amdt. 21–70, 57 FR 41368, Sept. 9, 1992; Amdt. 21–85, 69 FR 44861, July 27, 2004]
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