SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to certain Bombardier, Inc. Model BD-700-1A10, BD-700-1A11 airplanes. The NPRM was published in the Federal Register on April 23, 2026 (91 FR 21747). The NPRM was prompted by Transport Canada AD CF-2022-53, dated September 8, 2022 (Transport Canada AD CF-2022-53) (also referred to as the MCAI), issued by Transport Canada, which is the aviation authority for Canada. The MCAI states an in-service event occurred where a main landing gear tire burst upon landing. The investigation into the event found that with the loss of a 5V power supply in the BCU wheel control card, a residual current may build within the brake control valve (BCV) driver circuit. This residual current may result in uncommanded brake pressure during landing. If not corrected, this can cause one or more tires to burst due to a dragging brake or a locked brake, unexpected deceleration, degraded braking performance, directional difficulties, or brake(s) overheating.

In the NPRM, the FAA proposed to require an inspection to determine if an affected BCU is installed, replacement of affected BCUs, and prohibit the installation of affected parts, as specified in Transport Canada AD CF-2022-53. The FAA is issuing this AD to address the unsafe condition on these products.

You may examine the MCAI in the AD docket at regulations.gov under Docket No. FAA-2026-3864.

Discussion of Final Airworthiness Directive

Comments

The FAA received a comment from NetJets Aviation. The following presents the comment received on the NPRM and the FAA's response to the comment.

Request To Allow the Use of Maintenance Records

NetJets Aviation requested that the FAA revise the proposed AD to allow logbook research as an acceptable method of compliance for Part I, “Verification of Installed Parts,” of Transport Canada AD CF-2022-53. NetJets Aviation stated that determining whether BCU part number GW415-7125-7 is installed can be reliably accomplished through review of aircraft maintenance records and component installation history when documentation is complete and traceable, without requiring a physical inspection. NetJets Aviation also stated that allowing this approach would reduce unnecessary maintenance burden while maintaining an equivalent level of safety.

The FAA agrees. The FAA has determined that a review of airplane maintenance records is acceptable in lieu of the inspection to determine the BCU part number, provided the BCU part number can be conclusively determined from that review. The FAA has added an exception to paragraph (h)(2) of this AD accordingly.

Conclusion

These products have been approved by the civil aviation authority of another country and are approved for operation in the United States. Pursuant to the FAA's bilateral agreement with this State of Design Authority, that authority has notified the FAA of the unsafe condition described in the MCAI referenced above. The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these products. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator.

Material Incorporated by Reference Under 1 CFR Part 51

Transport Canada AD CF-2022-53 specifies procedures for an inspection to determine if BCUs with part number (P/N) GW415-7125-7 (Crane P/N 42-965-3) are installed and replacement of affected parts with BCU P/N GW415-7125-9 (Crane P/N 42-965-4). Transport Canada AD CF-2022-53 also prohibits the installation of affected parts.

This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.

Costs of Compliance

The FAA estimates that this AD affects 42 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: ( printed page 47935)

The FAA estimates the following costs to do any necessary on-condition action that would be required based on the results of any required actions. The FAA has no way of determining the number of aircraft that might need this on-condition action:

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation Programs, describes in more detail the scope of the Agency's authority.

The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

Regulatory Findings

This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify that this AD:

(1) Is not a “significant regulatory action” under Executive Order 12866,

(2) Will not affect intrastate aviation in Alaska, and

(3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

The Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: