AD 2026-22-06

This section of the FEDERAL REGISTER contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510. The Code of Federal Regulations is sold by the Superintendent of Documents. Rules and Regulations Federal Register 68873 Vol. 91, No. 210 Monday, November 2, 2026 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2026–4633; Project Identifier MCAI–2025–01173–A; Amendment 39–23508; AD 2026–22–06] RIN 2120–AA64 Airworthiness Directives; Diamond Aircraft Industries Inc. Airplanes AGENCY : Federal Aviation Administration (FAA), DOT. ACTION : Final rule. SUMMARY : The FAA is adopting a new airworthiness directive (AD) for all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes. This AD was prompted by several reports of passenger door separation during flight. This AD requires revising the existing airplane flight manual (AFM) to provide the flight crew with revised operating limitations, emergency procedures, and normal operating procedures; inspecting the passenger door latching mechanism and safety hook mechanism areas and performing corrective action, as applicable; inspecting the safety hook, latching bolts, front and rear door guide blocks, canopy and passenger door warning light, carbon hinges, tension spring, retaining block, safety hook push button, latching mechanism spring, gas spring, and door frame; measuring the passenger door handle actuation force; modifying the airplane with placards; replacing the gas spring; and replacing the hook assembly, retaining block, door guide blocks, and door sealant if necessary. The FAA is issuing this AD to address the unsafe condition on these products. DATES : This AD is effective December 7, 2026. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of December 7, 2026. ADDRESSES : AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA–2026–4633; 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 final rule, the mandatory continuing airworthiness information (MCAI), any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590. Material Incorporated by Reference: • For Diamond Aircraft material identified in this AD, contact DAI, 1560 Crumlin Sideroad, London, Ontario, Canada, N5V 1S2; phone: (519) 457– 4041; email: support-canada@ diamondaircraft.com; website: diamondaircraft.com. • You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 1100 Main, Kansas City, MO 64105. For information on the availability of this material at the FAA, call (817) 222–5110. It is also available at regulations.gov under Docket No. FAA–2026–4633. FOR FURTHER INFORMATION CONTACT : Fatin Saumik, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (516) 228– 7300; email: fatin.r.saumik@faa.gov. 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 all DAI Model DA 40, DA 40 F, and DA 40 NG airplanes. The NPRM was published in the Federal Register on May 13, 2026 (91 FR 26952). The NPRM was prompted by Transport Canada AD CF–2025–30, dated June 23, 2025 (referred to as the MCAI), issued by Transport Canada, which is the aviation authority for Canada. The MCAI states that there have been several reports of passenger door separation. DAI attributed the root cause of certain instances to the passenger door not being properly latched and subsequent attempts to latch the passenger door in flight. DAI was unable to find a definitive root cause of the remaining occurrences. Passenger door separation, if not addressed, could result in damage to the airplane structure and lead to loss of control of the airplane and injury to persons on the ground. In the NPRM, the FAA proposed to require revising the existing AFM to provide the flight crew with revised operating limitations, emergency procedures, and normal operating procedures; inspecting the passenger door latching mechanism and safety hook mechanism areas and performing corrective action, as applicable; inspecting the safety hook, latching bolts, front and rear door guide blocks, canopy and passenger door warning light, carbon hinges, tension spring, retaining block, safety hook push button, latching mechanism spring, gas spring, and door frame; measuring the passenger door handle actuation force; modifying the airplane with placards; replacing the gas spring; and replacing the hook assembly, retaining block, door guide blocks, and door sealant if necessary. 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–2026–4633. Discussion of Final Airworthiness Directive Comments The FAA received comments from four individual commenters. Three commenters requested that the FAA revise the applicability of the proposed AD, and one commenter requested a change concerning the service information specified in the proposed AD. The following presents the comments received on the NPRM and the FAA’s response to each comment. Request To Limit Applicability Three individual commenters requested that the FAA revise the applicability of the proposed AD to exclude newer serial-numbered airplanes. The commenters stated that the unsafe condition resulted from early generation door locking architectures and that newer airplanes are equipped with a secondary safety latch that completely eliminates the unsafe condition. The commenters stated that applying the AD to all Model DA 40, DA 40 F, and DA 40 NG airplanes would impose unnecessary maintenance requirements on airplanes already equipped with this safety mechanism. 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68874 Federal Register / Vol. 91, No. 210 / Monday, November 2, 2026 / Rules and Regulations The FAA disagrees with the request. According to DAI, there are two configurations of the door handle, an older and a newer configuration, and both configurations include a red safety hook. However, the red safety hook was not designed to hold the door closed during takeoff and, therefore, does not completely eliminate the unsafe condition. The FAA, in working with Transport Canada and DAI, has determined that the secondary safety latch does not resolve the unsafe condition and that the unsafe condition is not limited to older serial-numbered airplanes. The Model DA 40 NG is the latest model, and it has experienced several occurrences of door separation. Therefore, the FAA did not change this AD as a result of these comments. Request To Allow Later Revisions of Service Information An individual commenter requested that the FAA revise the proposed AD to allow the use of later revisions of the service information, rather than specifying the individual revisions of the service information for which credit would be provided. The commenter stated that allowing later revisions would permit the manufacturer to incorporate improvements into the service information without requiring owners to repeat an inspection unnecessarily. The FAA disagrees with the request to allow credit for later revision of the service material because referring to documents that do not exist at the time the AD is published violates Office of the Federal Register (OFR) regulations regarding approval of materials ‘‘incorporated by reference’’ in rules. These OFR regulations require that either the service document be submitted for approval by the OFR as ‘‘referenced’’ material, in which case it may be simply called out in the text of an AD, or the service document contents be published as part of the actual AD language. An AD may reference only the specific service document that was submitted and approved by the OFR for ‘‘incorporation by reference.’’ In order for operators to use later revisions of the referenced document (issued after the publication of the AD), either the FAA must revise the AD to reference the specific later revisions, or operators must request the approval of their use as an alternative method of compliance (under the provisions of paragraph (l) of this AD). Therefore, the FAA did not change this AD as a result of this comment. 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 The FAA reviewed Diamond Aircraft Mandatory Service Bulletin MSB 40– 103/MSB F4–042/MSB D4–114/MSB 40NG–084 REV. 2, dated June 5, 2025 (issued as one document), published with Diamond Aircraft Work Instruction WI–MSB 40–103/WI–MSB F4–042/WI– MSB D4–114/WI–MSB 40NG–084 REV. 2, dated June 5, 2025 (issued as one document). This material specifies procedures for inspecting the passenger door latching mechanism and safety hook mechanism areas and performing corrective action, as applicable; inspecting the safety hook, latching bolts, front and rear door guide blocks, canopy and passenger door warning light, carbon hinges, tension spring, retaining block, safety hook push button, latching mechanism spring, gas spring, and door frame; measuring the passenger door handle actuation force; modifying the airplane with placards; replacing the gas spring; and replacing the hook assembly, retaining block, door guide blocks, and door sealant if necessary for Model DA 40, DA 40 F, and DA 40 NG airplanes. The FAA also reviewed Diamond Aircraft DA 40 AFM Doc. No. 6.01.01– E Temporary Revision TR–MAM–40– 1203, Door Latching and Locking, dated December 16, 2024; Diamond Aircraft DA 40 F AFM Doc. No. 6.01.02–E Temporary Revision TR–MAM–40– 1203, Door Latching and Locking, dated December 16, 2024; and Diamond Aircraft DA 40 NG AFM Doc. No. 6.01.15–E Temporary Revision TR– MAM–40–1203/a, Door Latching and Locking, dated February 18, 2025. This material specifies procedures for amending the AFM by revising the operating limitations, emergency procedures, and normal operating procedures related to door latching and locking for Model DA 40, DA 40 F, and DA 40 NG airplanes. 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. Differences Between This AD, the MCAI, and the Referenced Material The MCAI applies to DAI Model DA 40 D airplanes, but this AD does not include this model because it does not have an FAA type certificate. The service bulletin referred to in the MCAI specifies to contact DAI for repair instructions, but this AD requires contacting the Manager, International Validation Branch, FAA; Transport Canada; or DAI’s Transport Canada Design Organization Approval (DOA) instead. The material referenced above specifies recording any findings in the execution report and submitting the execution report to DAI, but this AD does not include that requirement. Interim Action The FAA considers this AD an interim action. This unsafe condition is still under investigation by the manufacturer and, depending on the results of that investigation, the FAA may consider further rulemaking action. Costs of Compliance The FAA estimates that this AD affects 987 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: E STIMATED C OSTS Action Labor cost Parts cost Cost per product Cost on U.S. operators AFM revision ..................... 1 work-hour × $85 per hour = $85 ........ $0 $85 .................................... $83,895. Initial inspection ................ 3 work-hours × $85 per hour = $255 ..... 76 $331 .................................. $326,697. VerDate Sep<11>2014 15:46 Oct 30, 2026 Jkt 271001 PO 00000 Frm 00002 Fmt 4700 Sfmt 4700 E:\FR\FM\02NOR1.SGM 02NOR1 lotter on DSK8BHNXB4PROD with RULES1

68875 Federal Register / Vol. 91, No. 210 / Monday, November 2, 2026 / Rules and Regulations E STIMATED C OSTS —Continued Action Labor cost Parts cost Cost per product Cost on U.S. operators Repetitive inspections ....... 1 work-hour × $85 per hour = $85 per inspection. 0 $85 per inspection ............ $83,895 per inspection. The FAA estimates the following costs to do any replacements that would be required based on the results of the inspection. The agency has no way of determining the number of airplanes that might need these replacements: O N -C ONDITION C OSTS Action Labor cost Parts cost Cost per product Gas spring replacement ............................................... 2 work-hours × $85 per hour = $170 ........................... $489 $659 Hook assembly replacement ........................................ 4 work-hours × $85 per hour = $340 ........................... 484 824 Retaining block replacement ........................................ 1 work-hour × $85 per hour = $85 ............................... 166 251 Door guide block replacement ..................................... 1 work-hour × $85 per hour = $85 ............................... 206 291 Door sealant replacement ............................................ 1 work-hour × $85 per hour = $85 ............................... 15 100 The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES ■ 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] ■ 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2026–22–06 Diamond Aircraft Industries Inc.: Amendment 39–23508; Docket No. FAA–2026–4633; Project Identifier MCAI–2025–01173–A. (a) Effective Date This airworthiness directive (AD) is effective December 7, 2026. (b) Affected ADs None. (c) Applicability This AD applies to all Diamond Aircraft Industries Inc. (DAI) Model DA 40, DA 40 F, and DA 40 NG airplanes, certificated in any category. (d) Subject Joint Aircraft System Component (JASC) Code 5210, Passenger/Crew Doors. (e) Unsafe Condition This AD was prompted by several reports of passenger door separation during flight. The FAA is issuing this AD to address this unsafe condition. The unsafe condition, if not addressed, could result in damage to the airplane structure and lead to loss of control of the airplane and injury to persons on the ground. (f) Definition For the purpose of this AD, the Diamond Aircraft work instruction is defined as Diamond Aircraft Work Instruction WI–MSB 40–103/WI–MSB F4–042/WI–MSB D4–114/ WI–MSB 40NG–084 REV. 2, dated June 5, 2025 (issued as one document), published with Diamond Aircraft Mandatory Service Bulletin MSB 40–103/MSB F4–042/MSB D4– 114/MSB 40NG–084 REV. 2, dated June 5, 2025 (issued as one document). (g) Applicable Airplane Flight Manual (AFM) Temporary Revisions The following presents the AFM and temporary revisions that apply to this AD and each individual model. (1) For Model DA 40 airplanes: Diamond Aircraft DA 40 AFM Doc. No. 6.01.01–E Temporary Revision TR–MAM–40–1203, Door Latching and Locking, dated December 16, 2024. (2) For Model DA 40 F airplanes: Diamond Aircraft DA 40 F AFM Doc. No. 6.01.02–E Temporary Revision TR–MAM–40–1203, Door Latching and Locking, dated December 16, 2024. (3) For Model DA 40 NG airplanes: Diamond Aircraft DA 40 NG AFM Doc. No. 6.01.15–E Temporary Revision TR–MAM– 40–1203/a, Door Latching and Locking, dated February 18, 2025. (h) Compliance Comply with this AD within the compliance times specified, unless already done. VerDate Sep<11>2014 15:46 Oct 30, 2026 Jkt 271001 PO 00000 Frm 00003 Fmt 4700 Sfmt 4700 E:\FR\FM\02NOR1.SGM 02NOR1 lotter on DSK8BHNXB4PROD with RULES1

68876 Federal Register / Vol. 91, No. 210 / Monday, November 2, 2026 / Rules and Regulations (i) Required Actions (1) Within 100 hours time-in-service (TIS) or 100 days, whichever occurs first after the effective date of this AD, revise the existing AFM for the airplane to include the information specified in the applicable AFM temporary revision specified in paragraphs (g)(1) through (3) of this AD. (i) The owner/operator (pilot) holding at least a private pilot certificate may revise the existing AFM for the airplane and must enter compliance with the applicable paragraph of this AD into the airplane maintenance records in accordance with 14 CFR 43.9(a) and 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439. (ii) The AFM revision required by paragraph (i)(1) of this AD may be accomplished before the initial inspection and modification required by paragraph (i)(2) or (3) of this AD for that airplane. (2) For airplanes with less than 100 total hours TIS as of the effective date of this AD: Within 100 hours TIS or 100 days, whichever occurs first after the effective date of this AD, accomplish the initial inspection of the safety hook, latching bolts, front and rear door guide blocks and the modification of the airplane with placards in accordance with the instructions of Section III, steps 5, 20 through 23, 28, 30, 31, and 33 through 36 in the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD, except accomplish the actions required by step 20(f) in accordance with paragraphs (i)(4) and (5) of this AD. (3) For airplanes that have accumulated 100 or more total hours TIS as of the effective date of this AD: Within 100 hours TIS or 100 days, whichever occurs first after the effective date of this AD, accomplish the initial inspection of the canopy and passenger door warning light, carbon hinges, safety hook, tension spring, retaining block, safety hook push button, safety hook mechanism, latching mechanism spring, gas spring, latching bolts, front and rear door guide blocks, and door frame; measure the passenger door handle actuation force; and accomplish the modification of the airplane with placards in accordance with the instructions of Section III, steps 2 through 10, 12, 13, 15, 17, 18, 20 through 24, and 28 through 36 in the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD, except accomplish the actions required by step 20(f) in accordance with paragraphs (i)(4) and (5) of this AD. (4) If, during the inspection required by step 20(f) in the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD, the force measured is less than 1.8 kg (18 N), and if the force measured during the inspection required by step 20(c) was between 2 kg (20 N) and 6 kg (60 N), perform the following: (i) Repeat the inspection required by step 20(c) in the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD every 100 hours TIS until the replacement of the gas spring required by paragraph (i)(4)(ii) of this AD is accomplished. (ii) Within 12 months after the effective date of this AD, replace the gas spring in accordance with the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD. (5) If, during the inspection specified in step 20(f) in the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD, the force measured is less than 1.8 kg (18 N), and if the force measured during the inspection required by step 20(c) was greater than 6 kg (60 N) or less than 2 kg (20 N), before further flight, replace the gas spring. (6) If, during any inspection as required by paragraph (i)(2) or (3) of this AD, any findings, as defined in Section III, steps 5, 6, 9, 12, 20, and 23 are identified, before further flight, accomplish the applicable corrective action(s) in accordance with the instructions of Section IV, IV.1, steps 1 through 9, VI.2 [ sic ], steps 1 and 2, VI.3 [ sic ], steps 1 and 2, and VI.4 [ sic ], steps 1 through 5 in the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD. (7) Where the instructions of Section III or Section IV of the Diamond Aircraft Work Instruction specified in paragraph (f) of this AD state to contact the manufacturer ‘‘in case of doubt’’ or for approved instructions, this AD requires before further flight, using instructions approved by the Manager, International Validation Branch, FAA; Transport Canada; or DAI’s Transport Canada Design Organization Approval (DOA), and within the compliance time specified therein, accomplishing those instructions. If approved by the DOA, the approval must include the DOA-authorized signature. (j) No Reporting Requirement Although the material referenced in paragraph (f) of this AD specifies to submit information to the manufacturer, this AD does not require that action. (k) Credit for Previous Actions You may take credit for the actions required by paragraph (i) of this AD if you performed those actions before the effective date of this AD using Diamond Aircraft Mandatory Service Bulletin MSB 40–103/ MSB F4–042/MSB D4–114/MSB 40NG–084 REV. 1, dated May 15, 2025 (issued as one document), published with Diamond Aircraft Work Instruction WI–MSB 40–103/WI–MSB F4–042/WI–MSB D4–114/WI–MSB 40NG– 084 REV. 1, dated May 15, 2025 (issued as one document); or Diamond Aircraft Mandatory Service Bulletin MSB 40–103/ MSB F4–042/MSB D4–114/MSB 40NG–084 REV. 0, dated March 20, 2025 (issued as one document), published with Diamond Aircraft Work Instruction WI–MSB 40–103/WI–MSB F4–042/WI–MSB D4–114/WI–MSB 40NG– 084 REV. 0, dated March 20, 2025 (issued as one document). (l) Alternative Methods of Compliance (AMOCs) The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph (m) of this AD and email to: AMOC@faa.gov. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. (m) Additional Information For more information about this AD, contact Fatin Saumik, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (516) 228– 7300; email: fatin.r.saumik@faa.gov. (n) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Diamond Aircraft Mandatory Service Bulletin MSB 40–103/MSB F4–042/MSB D4– 114/MSB 40NG–084 REV. 2, dated June 5, 2025 (issued as one document), published with Diamond Aircraft Work Instruction WI– MSB 40–103/WI–MSB F4–042/WI–MSB D4– 114/WI–MSB 40NG–084 REV. 2, dated June 5, 2025 (issued as one document). (ii) Diamond Aircraft DA 40 Airplane Flight Manual (AFM) Doc. No. 6.01.01–E Temporary Revision TR–MAM–40–1203, Door Latching and Locking, dated December 16, 2024. (iii) Diamond Aircraft DA 40 F AFM Doc. No. 6.01.02–E Temporary Revision TR– MAM–40–1203, Door Latching and Locking, dated December 16, 2024. (iv) Diamond Aircraft DA 40 NG AFM Doc. No. 6.01.15–E Temporary Revision TR– MAM–40–1203/a, Door Latching and Locking, dated February 18, 2025. (3) For Diamond Aircraft material identified in this AD, contact Diamond Aircraft Industries Inc., 1560 Crumlin Sideroad, London, Ontario, Canada, N5V 1S2; phone: (519) 457–4041; email: support- canada@diamondaircraft.com; website: diamondaircraft.com. (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 1100 Main, Kansas City, MO 64105. For information on the availability of this material at the FAA, call (817) 222–5110. (5) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ ibr-locations or email fr.inspection@nara.gov. Issued on October 26, 2026. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. 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