Code of Federal Regulations · Section
§ 1.3 — Rules Of Construction
14 C.F.R. § 1.3
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(a) In this chapter, unless the context requires otherwise:
(1) Words importing the singular include the plural;
(2) Words importing the plural include the singular; and
(3) Words importing the masculine gender include the feminine.
(b) In this chapter, the word:
(1) Shall is used in an imperative sense;
(2) May is used in a permissive sense to state authority or permission to do the act prescribed, and the words “no person may * * *” or “a person may not * * *” mean that no person is required, authorized, or permitted to do the act prescribed; and
(3) Includes means “includes but is not limited to”.
Authorizing Statute
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Federal Aviation Administration49 U.S.C. § 106