(a) Except as provided in paragraph (d) of this section, no person may
operate a civil aircraft without complying with the operating limitations
specified in the approved Airplane or Rotorcraft Flight Manual, markings,
and placards, or as otherwise prescribed by the certificating authority of
the country of registry.
(b) No person may operate a U.S.-registered civil aircraft --
(1) For which an Airplane or Rotorcraft Flight Manual is required by
§21.5 of this chapter unless there is available in the aircraft a current,
approved Airplane or Rotorcraft Flight Manual or the manual provided for
in §121.141(b); and
(2) For which an Airplane or Rotorcraft Flight Manual is not required
by §21.5 of this chapter, unless there is available in the aircraft a
current approved Airplane or Rotorcraft Flight Manual, approved manual
material, markings, and placards, or any combination thereof.
(c) No person may operate a U.S.-registered civil aircraft unless that
aircraft is identified in accordance with part 45 of this chapter.
(d) Any person taking off or landing a helicopter certificated under
part 29 of this chapter at a heliport constructed over water may make such
momentary flight as is necessary for takeoff or landing through the
prohibited range of the limiting height-speed envelope established for the
helicopter if that flight through the prohibited range takes place over
water on which a safe ditching can be accomplished and if the helicopter
is amphibious or is equipped with floats or other emergency flotation gear
adequate to accomplish a safe emergency ditching on open water.