114.23—Maximum period.
(a) A.T.A. carnet.
No A.T.A. carnet with a period of validity exceeding 1 year from date of issue shall be accepted. This period of validity cannot be extended.
(b) TIR carnet.
A TIR carnet may be accepted without limitation as to time provided it is initially “taken on charge by a customs administration (United States or foreign) within the period of validity shown on its front cover.”
(c) TECRO/AIT carnet.
A TECRO/AIT carnet shall not be issued with a period of validity exceeding one year from the date of issue. This period of validity cannot be extended and must be shown on the front cover of the carnet.