Originally Posted by skky
The aircraft met the requirements when it was certified and WAT conditions will not invalidate an Airworthiness Certificate.
The Airworthiness Certificate states that the airplane must be operated in accordance with the Limitations stated in the Airplane Flight Manual. These limitations include structural limits (MTOW, MLW, MZFW), CG limits, max operating speeds,
and WAT limits.
Sec. 91.9 Civil aircraft flight manual, marking, and placard requirements.
(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.