The 2026 edition of National Fire Protection Association (NFPA) 409: Standard on Aircraft Hangars includes several NATA-proposed updates impacting hangar design and fire protection to provide greater clarity, flexibility, and cost efficiency for general aviation hangar owners and operators while maintaining a strong focus on safety. Throughout the standards-development process, NATA collaborated with industry and fire protection stakeholders while leading advocacy for practical, safety-focused improvements.
Key updates include raising the minimum aircraft access door height to 35 feet for Group II hangars, eliminating the requirement for column sprinklers when a foam system is not required, and reinstating “hangar cluster” separation criteria for Group III hangars. The standard also clarifies the definition of hazardous operations as activities that “when performed, lead to an increased likelihood of causing a fuel spill fire,” with additional explanatory guidance provided in the Annex.
“For years, NATA has advocated for hangar standards that reflect how aircraft are actually designed, stored, and maintained. Increasing the Group II door height to 35 feet removes an artificial limitation that drove costly and unnecessary fire protection requirements, while still preserving a strong safety framework. This change represents a clear example of aligning regulation with operational reality,” said NATA President and CEO Curt Castagna.
NATA will continue to support members by providing education, implementation guidance, and advocacy as these updates are adopted by authorities having jurisdiction and incorporated into local codes. Stay tuned for information on an upcoming webinar to educate members and industry stakeholders on these changes and their implications for hangar operations and compliance.