Special Conditions: The Boeing Company Model 777-9 Airplane; Operation Without Normal Electrical Power

Final Rule Final · effective Published 2025-05-23 Effective 2025-06-23 90 FR 22005 View on federalregister.gov ↗

Affects · Manufacturers · 14 CFR 25

Abstract

These special conditions are issued for the Boeing Company (Boeing) Model 777-9 series airplane. This airplane will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. This design feature is electrical and electronic systems that perform critical functions, the loss of which could be catastrophic to the airplane. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

Full text

15 paragraphs · 303 words.

[Federal Register Volume 90, Number 99 (Friday, May 23, 2025)] [Rules and Regulations] [Pages 22005-22007] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-09414]

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Federal Register / Vol. 90, No. 99 / Friday, May 23, 2025 / Rules and Regulations

[[Page 22005]]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2021-0894; Special Conditions No. 25-791A-SC]

Special Conditions: The Boeing Company Model 777-9 Airplane; Operation Without Normal Electrical Power

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; amendment.

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SUMMARY: These special conditions are issued for the Boeing Company (Boeing) Model 777-9 series airplane. This airplane will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. This design feature is electrical and electronic systems that perform critical functions, the loss of which could be catastrophic to the airplane. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

DATES: Effective June 23, 2025.

FOR FURTHER INFORMATION CONTACT: Nazih Khaouly, Electrical Systems, AIR-626A, Technical Policy Branch, Policy and Standards Division, Aircraft Certification Service, Federal Aviation Administration, 2200 South 216th Street, Des Moines, Washington 98198; telephone 206-231- 3160; email; [email protected].

Verbatim from the Federal Register. The agency's published document is the authoritative source. federalregister.gov ↗