FAA TSO C39A PDF

Applicability - (1) Minimum performance standards. (1) This technical standard order prescribes the minimum performance standards that aircraft seats and berths of the following types must meet in order to be identified with the applicable TSO marking:

Type I -- Transports (9g forward load)

Type II -- Normal and Utility

Type III -- Acrobatic

Type IV -- Rotorcraft

(ii) New models of seats and berths that are to be so identified and that are manufactured on or after May 1, 1972, must meet the standards set forth in National Aircraft Standard (NAS) Specification 809, dated January 1, 1956 with the exceptions covered in subparagraph (2) of this paragraph. NAS 809 is incorporated by reference herein in accordance with 5 U.S.C. 552(a)(1) and § 37.23 and is available as indicated in § 37.23. Additionally, NAS 809 may be examined at any FAA regional office of the Chief Engineering and Manufacturing Branch (or in the case of the Western Region, the Chief Aircraft Engineering Division), and may be obtained from the National Standards Association 1321 14th Street NW., Washington, DC 20005, at the cost of three (3) dollars.