(a) Except as provided in paragraph (b) of this section, no person may
operate a civil aircraft of U.S. registry in airspace designated as
Minimum Navigation Performance Specifications airspace unless --
(1) The aircraft has approved navigation performance capability that
complies with the requirements of appendix C of this part; and
(2) The operator is authorized by the Administrator to perform such
(b) The Administrator may authorize a deviation from the requirements
of this section in accordance with Section 3 of appendix C to this part.