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14 CFR § 91.203
Volume 2 · Title 14 of the Code of Federal Regulations, 2025 edition.
Civil aircraft: Certifications required
Sec. 91.203 Civil aircraft: Certifications required.
(a) Except as provided in Sec. 91.715, no person may operate a
civil aircraft unless it has within it the following:
(1) An appropriate and current airworthiness certificate. Each U.S.
airworthiness certificate used to comply with this subparagraph (except
a special flight permit, a copy of the applicable operations
specifications issued under Sec. 21.197(c) of this chapter, appropriate
sections of the air carrier manual required by parts 121 and 135 of this
chapter containing that portion of the operations specifications issued
under Sec. 21.197(c), or an authorization under Sec. 91.611) must have
on it the registration number assigned to the aircraft under part 47 or
48 of this chapter. However, the airworthiness certificate need not have
on it an assigned special identification number before 10 days after
that number is first affixed to the aircraft. A revised airworthiness
certificate having on it an assigned special identification number, that
has been affixed to an aircraft, may only be obtained upon application
to the responsible Flight Standards office.
(2) An effective U.S. registration certificate issued to its owner
or, for operation within the United States, the second copy of the
Aircraft registration Application as provided for in Sec. 47.31(c), a
Certificate of Aircraft registration as provided in part 48, or a
registration certification issued under the laws of a foreign country.
(b) No person may operate a civil aircraft unless the airworthiness
certificate required by paragraph (a) of this section or a special
flight authorization issued under Sec. 91.715 is displayed at the cabin
or cockpit entrance so that it is legible to passengers or crew.
(c) No person may operate an aircraft with a fuel tank installed
within the
passenger compartment or a baggage compartment unless the installation
was accomplished pursuant to part 43 of this chapter, and a copy of FAA
Form 337 authorizing that installation is on board the aircraft.
(d) No person may operate a civil airplane (domestic or foreign)
into or out of an airport in the United States unless it complies with
the fuel venting and exhaust emissions requirements of part 34 of this
chapter.
[Docket 18334, 54 FR 34292, Aug. 18, 1989, as amended by Amdt. 91-218,
55 FR 32861, Aug. 10, 1990; Amdt. 91-318, 75 FR 41983, July 20, 2010;
Amdt. 91-338, 80 FR 78648, Dec. 16, 2015; Docket FAA-2018-0119, Amdt.
91-350, 83 FR 9171, Mar. 5, 2018; Docket FAA-2022-1355, Amdt. 91-366, 87
FR 75846, Dec. 9, 2022]U.S. Government work — public domain (17 U.S.C. §105). Reproduced from the checksummed 2025 annual edition of Title 14; always confirm against the current eCFR.