14 C.F.R. § 135.185 Empty weight and center of gravity: Currency requirement.
Title 14 - Aeronautics and Space
(a) No person may operate a multiengine aircraft unless the current empty weight and center of gravity are calculated from values established by actual weighing of the aircraft within the preceding 36 calendar months. (b) Paragraph (a) of this section does not apply to— (1) Aircraft issued an original airworthiness certificate within the preceding 36 calendar months; and (2) Aircraft operated under a weight and balance system approved in the operations specifications of the certificate holder.
Title 14: Aeronautics and Space
PART 135—OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
Subpart C—Aircraft and Equipment
§ 135.185 Empty weight and center of gravity: Currency requirement.
