SUPPLEMENTARY INFORMATION:

Comments Invited

FAA invites interested persons to participate in this rulemaking by submitting written comments, data, or views. FAA also invites comments relating to the economic, environmental, energy, or federalism impacts that might result from adopting the proposals in this document. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. To ensure the docket does not contain duplicate comments, commenters should send only one copy of written comments, or if comments are filed electronically, commenters should submit only one time.

FAA will file in the docket all comments it receives, as well as a report summarizing each substantive public contact with FAA personnel concerning this proposed rulemaking. Before acting on this proposal, FAA will consider all comments it receives on or before the closing date for comments. FAA will consider comments filed after the comment period has closed if it is possible to do so without incurring expense or delay. FAA may change this proposal in light of the comments it receives.

Privacy: In accordance with 5 U.S.C. 553(c), DOT solicits comments from the public to better inform its rulemaking process. DOT posts these comments, without edit, including any personal information the commenter provides, to www.regulations.gov, as described in the system of records notice (DOT/ALL-14 FDMS), which can be reviewed at www.dot.gov/​privacy.

Confidential Business Information

Confidential Business Information (CBI) is commercial or financial information that is both customarily and actually treated as private by its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public disclosure. If your comments responsive to this NPRM contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI as “PROPIN.” FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI should be sent to the person in the FOR FURTHER INFORMATION CONTACT section of this document. Any commentary FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

Availability of Rulemaking Documents

A copy of this NPRM, all comments received, any final rule, and all background material may be viewed online at www.regulations.gov using the docket number listed above. Electronic retrieval help and guidelines are available on the website. It is available 24 hours each day, 365 days each year. An electronic copy of this document may also be downloaded from the Office of the Federal Register's website at www.federalregister.gov and the ( printed page 50739) Government Publishing Office's website at www.govinfo.gov. A copy may also be found at FAA's Regulations and Policies website at www.faa.gov/​regulations_​policies.

Copies may also be obtained by sending a request to the Federal Aviation Administration, Office of Rulemaking, ARM-1, 800 Independence Avenue SW, Washington, DC 20591, or by calling (202) 267-9677. Requests must identify the docket or notice number of this rulemaking.

All documents FAA considered in developing this proposed rule, including economic analyses and technical reports, may be accessed in the electronic docket for this rulemaking.

Background

On June 26, 2026, FAA published a NPRM titled “Transport Airplane and Propulsion Certification Modernization” in the Federal Register (91 FR 38878; Notice No. 26-09). In that document, FAA proposed to amend various airworthiness regulations to modernize certain certification standards for transport category airplanes and propulsion systems. This rule would be both deregulatory and relieving by reducing the number of exemptions, special conditions, and equivalent level of safety findings required during the certification process. FAA expects that this proposal would reduce certification costs and time to certify new and changed products for both industry and FAA while maintaining or increasing the level of safety provided by the current regulations. FAA proposes to remove Special Federal Aviation Regulation No. 109 from part 25 and relocate certain of its requirements. Finally, this action would address industry and National Transportation Safety Board recommendations while also harmonizing FAA's regulations with international standards. Commenters were instructed in the NPRM to provide comments on or before August 25, 2026 ( i.e., 60 days after the date of the publication of the NPRM).

Since publication of the NPRM, FAA has received a request from the Aerospace, Security and Defence Industries Association of Europe (ASD) to extend the comment period by an additional sixty (60) days. This organization requested more time to review the proposed rule, develop comments and recommendations, and coordinate those comments among their stakeholders.^[1]

Extension of Comment Period

FAA has reviewed, and partially grants, the request for an extension of the comment period. FAA recognizes the importance of the proposed rule, and that an extension would help commenters craft complete and thoughtful responses. However, FAA finds that an additional thirty (30) days will provide sufficient opportunity to review the NPRM and provide comments.

• • • Accordingly, the comment period for Notice No. 26-09 is extended by thirty (30) days and will now close on September 24, 2026.

This will provide the public with a total of ninety (90) days to conduct its review and submit comments to the docket. FAA does not intend to approve additional requests to further extend the comment period for this rulemaking.

Issued under authority provided by 5 U.S.C. 553(c), and 49 U.S.C. 106(f) and 44701, in Washington, DC.

91 FR 50738