Airworthiness Directives; Bombardier, Inc., Airplanes

DEPARTMENT OF TRANSPORTATION <SUBAGY>Federal Aviation Administration</SUBAGY> <CFR>14 CFR Part 39</CFR> <DEPDOC>[Docket No. FAA-2025-3435; Project Identifier MCAI-2025-01602-T]</DEPDOC> <RIN>RIN 2120-AA64</RIN> <SUBJECT>Airworthiness Directives; Bombardier, Inc., Airplanes</SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Federal Aviation Administration (FAA), DOT. <HD SOURCE="HED">ACTION:</HD> Notice of proposed rulemaking (NPRM). <SUM> <HD SOURCE="HED">SUMMARY:</HD> The FAA proposes to supersede Airworthiness Directive (AD) 2025-17-12, which applies to all Bombardier, Inc., Model CL-600-1A11 (600) and CL-600-2A12 (601) airplanes, and certain Model CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. AD 2025-17-12 requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. Since the FAA issued AD 2025-17-12, the FAA has determined that certain serial numbers for affected Model CL-600-2B16 (604 Variants) airplanes are not included in the applicability of AD 2025-17-12. This proposed AD would continue to require the actions specified in AD 2025-17-12 and would add airplanes to the applicability. The FAA is proposing this AD to address the unsafe condition on these products. </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> The FAA must receive comments on this NPRM by November 20, 2025. </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: • <E T="03">Federal eRulemaking Portal:</E> Go to <E T="03">regulations.gov</E> . Follow the instructions for submitting comments. • <E T="03">Fax:</E> 202-493-2251. • <E T="03">Mail:</E> U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590. • <E T="03">Hand Delivery:</E> Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. <E T="03">AD Docket:</E> You may examine the AD docket at <E T="03">regulations.gov</E> under Docket No. FAA-2025-3435; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the mandatory continuing airworthiness information (MCAI), any comments received, and other information. The street address for Docket Operations is listed above. <E T="03">Material Incorporated by Reference:</E> • For Bombardier material identified in this proposed AD, contact Bombardier Business Aircraft Customer Response Center, 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-2999; email <E T="03">ac.yul@aero.bombardier.com;</E> website <E T="03">https://my.bombardier.com/.</E> • You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> Brenda L. Buitrago, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: <E T="03">9-avs-nyaco-cos@faa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> <HD SOURCE="HD1">Comments Invited</HD> The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments using a method listed under the <E T="02">ADDRESSES</E> section. Include “Docket No. FAA-2025-3435; Project Identifier MCAI-2025-01602-T” at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments. Except for Confidential Business Information (CBI) as described in the following paragraph, and other information as described in 14 CFR 11.35, the FAA will post all comments received, without change, to <E T="03">regulations.gov,</E> including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM. <HD SOURCE="HD1">Confidential Business Information</HD> 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 that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI as “PROPIN.” The 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 Brenda L. Buitrago, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: <E T="03">9-avs-nyaco-cos@faa.gov.</E> Any commentary that the FAA receives that is not specifically designated as CBI will be placed in the public docket for this rulemaking. <HD SOURCE="HD1">Background</HD> The FAA issued AD 2025-17-12, Amendment 39-23122 (90 FR 46330, September 26, 2025) (AD 2025-17-12), for all Bombardier, Inc., Model CL-600-1A11 (600) and CL-600-2A12 (601) airplanes, and certain Model CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. AD 2025-17-12 was prompted by an MCAI originated by Transport Canada, which is the aviation authority for Canada. Transport Canada issued AD CF-2024-16, dated May 23, 2024 (Transport Canada AD CF-2024-16), to correct an unsafe condition. AD 2025-17-12 requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA issued AD 2025-17-12 to address new or more restrictive limitations. Failure to comply with these new or more restrictive limitations could adversely affect the continued airworthiness of the airplane. <HD SOURCE="HD1">Actions Since AD 2025-17-12 Was Issued</HD> Since the FAA issued AD 2025-17-12, the FAA has determined that certain serial numbers for affected Model CL-600-2B16 (604 Variant) airplanes are not included in the applicability of AD 2025-17-12. Table 1 to paragraph (g)(1) of AD 2025-17-12 and table 2 to paragraph (g)(2) of AD 2025-17-12 identify the applicable airplanes for each document by serial numbers. For Model CL-600-2B16 (604 Variant) airplanes, the serial numbers start at 5301. However, paragraph (c)(2) of AD 2025-17-12 only identifies Model CL-600-2B16 (604 Variant) airplanes, serial numbers (S/Ns) 6050 through 6192 inclusive. Therefore, the FAA is revising the applicability of this proposed AD by adding Model CL-600-2B16 (604 Variant) airplanes, S/Ns 5301 through 5665 inclusive and S/Ns 5701 through 6049 inclusive. The FAA has removed references to those serial numbers from table 1 to paragraph (g)(1) of this proposed AD and table 2 to paragraph (g)(2) of this proposed AD and added actions for those airplanes to paragraph (i) of this proposed AD. The FAA has also determined that the last row of table 2 to paragraph (g)(2) of AD 2025-17-12 inadvertently lists S/N 6193 instead of S/N 6192. Airplanes having S/N 6193 and subsequent were delivered with Bombardier Temporary Revision No. 5-2-5, dated October 16, 2023, and must comply with the airworthiness limitations specified as part of the approved type design. The FAA has revised table 2 to paragraph (g)(2) of this proposed AD accordingly. The FAA is proposing this AD to address the unsafe condition on these products. You may examine the MCAI in the AD docket at <E T="03">regulations.gov</E> under Docket No. FAA-2025-3435. <HD SOURCE="HD1">Material Incorporated by Reference Under 1 CFR Part 51</HD> This proposed AD would require the following Bombardier material, which the Director of the Federal Register approved for incorporation by reference as of October 31, 2025 (90 FR 46333, September 26, 2025): • Section 5-10-00, “Airworthiness Limitations,” of Bombardier Challenger 600 Time Limits/Maintenance Checks (TLMC), Publication No. PSP 605, Revision 39, dated January 8, 2018. (For obtaining these sections of Bombardier Challenger 600 TLMC, Publication No. PSP 605, use Document Identification No. CH 600 TLMC.) • Section 5-10-00, “Airworthiness Limitations,” of Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, Revision 46, dated January 8, 2018. (For obtaining these sections of Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, use Document Identification No. CH 601 TLMC.) • Section 5-10-00, “Airworthiness Limitations,” of Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, Revision 42, dated January 8, 2018. (For obtaining these sections of Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, use Document Identification No. CH 601 TLMC-1.) • Part 2, “Airworthiness Limitations,” of Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC, Revision 33, dated November 22, 2022. (The document identification number for ordering Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC is incorrectly identified as “CH 600 TLMC” on page 2 of the TLMC. For obtaining Part 2 of Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC, use Document Identification No. CH 604 TLMC.) • Part 2, “Airworthiness Limitations,” of Bombardier Challenger 605 TLMC, Publication No. CH 605 TLMC, Revision 22, dated November 22, 2022. • Part 2, “Airworthiness Limit ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 36k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━