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 Department of Transportation Federal Aviation Administration 14 CFR Part 39
[Docket No. FAA-2024-2007; Project Identifier MCAI-2023-01270-T; Amendment 39-22871; AD 2024-21-04]
RIN 2120-AA64
 AGENCY: Federal Aviation Administration (FAA), DOT.
 ACTION: Final rule.
 SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by a determination that new or more restrictive maintenance tasks are necessary. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive maintenance tasks. The FAA is issuing this AD to address the unsafe condition on these products.
 DATES: This AD is effective December 17, 2024. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of December 17, 2024.
 ADDRESSES:  *AD Docket:*
                         You may examine the AD docket at 
                        *regulations.gov*
                         under Docket No. FAA-2024-2007; 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 Bombardier, Inc. material identified in this AD, contact Bombardier Business Aircraft Customer Response Center, 400 Côte Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-2999; email*ac.yul@aero.bombardier.com;*
                         website 
                        *bombardier.com.*
                    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. It is also available at*regulations.gov*
                         under Docket No. FAA-2024-2007.
 FOR FURTHER INFORMATION CONTACT: Steven Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone: 516-228-7300; email: 
                        *9-avs-nyaco-cos@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 Bombardier, Inc., Model BD-100-1A10 airplanes. The NPRM published in the 
                    **Federal Register**
                     on August 9, 2024 (89 FR 65267). The NPRM was prompted by AD CF-2023-78, dated December 19, 2023, issued by Transport Canada, which is the aviation authority for Canada (also referred to as the MCAI). The MCAI states that airplanes could experience misleading electrical system status indications (push button annunciators (PBA) and engine instrument and crew alerting system (EICAS)) as a result of contamination of electrical contacts in the left-hand (LH) direct current power center (DCPC) internal communication data bus. The MCAI states that new or more restrictive maintenance tasks have been developed to rectify lower time LH DCPC units not addressed by previously issued ADs. In the NPRM, the FAA proposed to require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive maintenance tasks. The FAA is issuing this AD to address erratic indications, which could cause the flightcrew to turn off fully operational electrical power sources, leading to partial or complete loss of electrical power. The unsafe condition, if not addressed, could result in loss of flight displays and reduced controllability of the airplane. You may examine the MCAI in the AD docket at 
                    *regulations.gov*
                     under Docket No. FAA-2024-2007. Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the cost to the public. Conclusion This product has been approved by the aviation authority of another country and is approved for operation in the United States. Pursuant to the FAA's bilateral agreement with this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI referenced above. The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on this product. Except for minor editorial changes, 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 the following documents: Task 24-61-01-101*, “Restoration of the left DC Power Center (DCPC) (Pre SB100-24-30),” Section 5-10-20, “Time Limits—Supplementary Limitations,” of Part 2, “Airworthiness Limitations”, of the Bombardier Challenger 300 Time Limits/Maintenance Checks, Publication No. CH 300 TLMC, Revision 24, dated August 9, 2023.
                Task 24-61-01-101*, “Restoration of the Left DC Power Center (DCPC) (Pre SB350-24-005),” Section 5-10-20, “Time Limits—Supplementary Limitations,” of Part 2, “Airworthiness Limitations,” of the Bombardier Challenger 350 Time Limits/Maintenance Checks, Publication No. CH 350 TLMC, Revision 14, dated August 9, 2023. This material specifies new or more restrictive airworthiness limitations for 
                    ( print page 88885)
                    safe life limits. These documents are distinct since they apply to different airplane configurations. The asterisk (or “one star”) with the last three digits of the task numbers indicates that the task is an airworthiness limitation task. 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 
                    **ADDRESSES**
                     section. Costs of Compliance The FAA estimates that this AD affects 356 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD. The FAA has determined that revising the maintenance or inspection program takes an average of 90 work-hours per operator, although the agency recognizes that this number may vary from operator to operator. Since operators incorporate maintenance or inspection program changes for their affected fleet(s), the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate. Therefore, the agency estimates the average total cost per operator to be $7,650 (90 work-hours × $85 per work-hour). 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
 2.The FAA amends § 39.13 by adding the following new airworthiness directive: **2024-21-04 Bombardier, Inc.:**
                             Amendment 39-22871; Docket No. FAA-2024-2007; Project Identifier MCAI-2023-01270-T. (a) Effective Date This airworthiness directive (AD) is effective December 17, 2024. (b) Affected ADs None. (c) Applicability This AD applies to all Bombardier, Inc., Model BD-100-1A10 airplanes, certificated in any category. (d) Subject Air Transport Association (ATA) of America Code 24, Electrical Power. (e) Unsafe Condition This AD was prompted by a determination that new or more restrictive maintenance tasks are necessary. The FAA is issuing this AD to address erratic indications, which could cause the flightcrew to turn off fully operational electrical power sources, leading to partial or complete loss of electrical power. The unsafe condition, if not addressed, could result in loss of flight displays and reduced controllability of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Maintenance or Inspection Program Revision Within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in the tasks specified in figure 1 to paragraph (g) of this AD, of Part 2, “Airworthiness Limitations,” of the applicable Time Limits/Maintenance Checks (TLMC) manual. The initial compliance time for doing the tasks is at the interval specified in the applicable TLMC manual specified in figure 1 to paragraph (g) of this AD, or within 60 days after the effective date of this AD, whichever occurs later. Figure 1 to Paragraph (
                                g
                                )—Time Limits—Supplementary Limitations Tasks
Airplane model
Chapter 5 task No.
Task title
TLMC section
TLMCBD-100-1A10 (Challenger 300)
24-61-01-101 *
Restoration of the Left DC Power Center (DCPC) (Pre SB100-24-30)
5-10-20, “Time Limits—Supplementary Limitations”
Revision 24, dated August 9, 2023.BD-100-1A10 (Challenger 350)
24-61-01-101 *
Restoration of the Left DC Power Center (DCPC) (Pre SB350-24-005)
5-10-20, “Time Limits—Supplementary Limitations”
Revision 14, dated August 9, 2023.
 Note 1 to paragraph (g): The asterisk (or “one star”) with the last three digits of the task numbers listed in figure 1 to paragraph (g) of this AD indicates that the task is an airworthiness limitation task. (h) No Alternative Actions or Intervals After the existing maintenance or inspection program has been revised as required by paragraph (g) of this AD, no alternative actions (
                            *e.g.,*
                             inspections) or intervals may be used unless the actions and intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (i)(1) of this AD.
                            ( print page 88886) (i) Other FAA AD Provisions The following provisions also apply to this AD: (1) 
                            *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 responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the International Validation Branch, mail it to the address identified in paragraph (j) of this AD. Information may be emailed to: 
                            *AMOC@faa.gov.*
                             Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (2) 
                            *Contacting the Manufacturer:*
                             For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, International Validation Branch, FAA; or Transport Canada; or Bombardier, Inc.'s Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. (j) Additional Information For more information about this AD, contact Steven Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone: 516-228-7300; email: 
                            *9-avs-nyaco-cos@faa.gov.* (k) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) 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 this AD specifies otherwise. (i) Task 24-61-01-101*, “Restoration of the left DC Power Center (DCPC) (Pre SB100-24-30),” Section 5-10-20, “Time Limits—Supplementary Limitations,” of Part 2, “Airworthiness Limitations”, of the Bombardier Challenger 300 Time Limits/Maintenance Checks, Publication No. CH 300 TLMC, Revision 24, dated August 9, 2023. Note 2 to paragraph (k)(2)(i): The asterisk (or “one star”) with the last three digits of the task numbers listed in paragraphs (k)(2)(i) and (ii) of this AD indicates that the task is an airworthiness limitation task. (ii) Task 24-61-01-101*, “Restoration of the Left DC Power Center (DCPC) (Pre SB350-24-005),” Section 5-10-20, “Time Limits—Supplementary Limitations,” of Part 2, “Airworthiness Limitations,” of the Bombardier Challenger 350 Time Limits/Maintenance Checks, Publication No. CH 350 TLMC, Revision 14, dated August 9, 2023. (3) For Bombardier Inc. material identified in this AD, contact Bombardier Business Aircraft Customer Response Center, 400 Côte Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514 855-2999; email 
                            *ac.yul@aero.bombardier.com;*
                             website 
                            *bombardier.com.* (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th Street, Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. (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-locationsoremailfr.inspection@nara.gov.* Issued on October 24, 2024. Victor Wicklund, Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service.


[FR Doc. 2024-25979 Filed 11-8-24; 8:45 am] BILLING CODE 4910-13-P