Sec. 23.31 - Removable ballast.
Removable ballast may be used in showing compliance with the flight requirements of this subpart, if --
(a) The place for carrying ballast is properly designed and installed, and is marked under §23.1557; and
(b) Instructions are included in the airplane flight manual, approved manual material, or markings and placards, for the proper placement of the removable ballast under each loading condition for which removable ballast is necessary.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30
FR 258, Jan. 9, 1965, as amended by Amdt. 23-13, 37 FR 20023, Sept. 23,