Airworthiness Directives; The Boeing Company Airplanes

Document 2026-13129 is a Proposed Rule published by the Department of Transportation in the Federal Register on June 30, 2026. The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This proposed AD was prompted by reports of potable water leaking into the electrical equipment bay cooling air inlet. This proposed AD would require performing repetitive inspections of potential water sources from the upper deck and the main deck, including potable water and waste water lines, for any water leaks and clogs, and applicable on- condition actions. The FAA is proposing this AD to address the unsafe condition on these products. View the original at https://www.federalregister.gov/documents/2026/06/30/2026-13129/airworthiness-directives-the-boeing-company-airplanes.

No. Document 2026-13129 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.