Airworthiness Directives; Bombardier, Inc., Airplanes

<RULE> DEPARTMENT OF TRANSPORTATION <SUBAGY>Federal Aviation Administration</SUBAGY> <CFR>14 CFR Part 39</CFR> <DEPDOC>[Docket No. FAA-2023-2000; Project Identifier MCAI-2023-00415-T; Amendment 39-22678; AD 2024-03-08]</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> Final rule. <SUM> <HD SOURCE="HED">SUMMARY:</HD> The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. This AD was prompted by reports that some overheat detection sensing elements of the bleed air leak detection system were manufactured with insufficient salt fill, which can result in an inability to detect hot bleed air leaks. This AD requires maintenance records verification, and if an affected part is installed, would prohibit the use of certain Master Minimum Equipment List (MMEL) items under certain conditions by requiring revising the operator's existing Minimum Equipment List (MEL). This AD also requires testing the overheat detection sensing elements, marking each serviceable sensing element with a witness mark, and replacing each nonserviceable part with a serviceable part. This AD also prohibits the installation of affected parts under certain conditions. The FAA is issuing this AD to address the unsafe condition on these products. </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> This AD is effective May 3, 2024. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of May 3, 2024. </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> <E T="03">AD Docket:</E> You may examine the AD docket at <E T="03">regulations.gov</E> under Docket No. FAA-2023-2000; 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. <E T="03">Material Incorporated by Reference:</E> • For Bombardier service information identified in this final rule, 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">bombardier.com</E> . • For Liebherr-Aerospace Toulouse SAS service information identified in this final rule, contact Liebherr-Aerospace Toulouse SAS, 408, Avenue des Etats-Unis-B.P.52010, 31016 Toulouse Cedex, France; telephone +33 (0)5.61.35.28.28; fax +33 (0)5.61.35.29.29; email <E T="03">techpub.toulouse@liebherr.com;</E> website <E T="03">liebherr.aero</E> . • 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. It is also available in the AD docket at <E T="03">regulations.gov</E> under Docket No. FAA-2023-2000. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> Steven Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 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">Background</HD> 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 and BD-700-1A11 airplanes. The NPRM published in the <E T="04">Federal Register</E> on November 15, 2023 (88 FR 78251). The NPRM was prompted by AD CF-2023-17, dated March 8, 2023 (Transport Canada AD CF-2023-17) (also referred to as the MCAI), issued by Transport Canada, which is the aviation authority for Canada. The MCAI states that Bombardier received reports from the supplier of the overheat detection sensing elements of a manufacturing quality escape. Some of the sensing elements of the bleed air leak detection system were manufactured with insufficient salt fill. This condition can result in an inability to detect hot bleed air leaks, which can cause damage to surrounding structures and systems and prevent continued safe flight and landing. In the NPRM, the FAA proposed to require maintenance records verification, and if an affected part is installed, would prohibit the use of certain MMEL items under certain conditions by requiring revising the operator's existing MEL. The NPRM also proposed to require testing the overheat detection sensing elements, marking each serviceable sensing element with a witness mark, and replacing each nonserviceable part with a serviceable part. The NPRM also proposed to prohibit the installation of affected parts under certain conditions. The FAA is issuing 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-2023-2000. <HD SOURCE="HD1">Discussion of Final Airworthiness Directive</HD> <HD SOURCE="HD1">Comments</HD> The FAA received a comment from NetJets. The following presents the comment received on the NPRM and the FAA's response to the comment. <HD SOURCE="HD1">Request for Clarification on Location of Date of Manufacture</HD> NetJets requested a statement be added to paragraph (h) of the proposed AD that the date of manufacture can be found in the aircraft maintenance logbook, in addition to the identification plate of the airplane on certain airplanes. This information is stated in Transport Canada AD CF-2023-17, Part II, paragraph (A). NetJets further stated that Bombardier no longer stamps a date on the airframe data plate. The FAA agrees the date of manufacture can be found either on the identification plate of certain airplanes or in the aircraft maintenance logbook. The FAA has amended paragraph (h) of this AD to specify the two locations where the date of manufacture can be found. <HD SOURCE="HD1">Change to NPRM Applicability</HD> Paragraph (c) of this AD has been revised to clarify that the applicability is limited to certain serial numbers, which are also identified in Transport Canada AD CF-2023-17. <HD SOURCE="HD1">Conclusion</HD> 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, considered the comment 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 this product. 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. <HD SOURCE="HD1">Related Service Information Under 1 CFR Part 51</HD> The FAA reviewed Liebherr Service Bulletin CFD-F1958-26-01, dated May 6, 2022, which specifies part numbers for affected sensing elements. The FAA reviewed the following Bombardier service bulletins, which specify procedures for testing each leak detection loop (LDL) sensing element installed on the airplane, marking each serviceable sensing element with a witness mark, and replacing each nonserviceable part with a serviceable part. These documents are distinct since they apply to different airplane models and configurations. • Bombardier Service Bulletin 700-1A11-36-005, Basic Issue, dated December 23, 2022; • Bombardier Service Bulletin 700-36-026, Basic Issue, dated December 23, 2022; • Bombardier Service Bulletin 700-36-5002, Basic Issue, dated December 23, 2022; • Bombardier Service Bulletin 700-36-5501, Basic Issue, dated December 23, 2022; and • Bombardier Service Bulletin 700-36-6002, Basic Issue, dated December 23, 2022; • Bombardier Service Bulletin 700-36-6501, Basic Issue, dated December 23, 2022. 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 <E T="02">ADDRESSES</E> section. <HD SOURCE="HD1">Costs of Compliance</HD> The FAA estimates that this AD affects 160 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: <GPOTABLE COLS="4" OPTS="L2,i1" CDEF="s50,10,xs66,xs72"> <TTITLE>Estimated Costs for Required Actions</TTITLE> <CHED H="1">Labor cost</CHED> <CHED H="1">Parts cost</CHED> Cost on U.S. operators </CHED> <ROW> <ENT I="01">Up to 140 work-hours × $85 per hour = $11,900</ENT> <ENT>$0</ENT> <ENT>Up to $11,900</ENT> <ENT>Up to $1,904,000.</ENT> </ROW> </GPOTABLE> The FAA has received no definitive data on which to base the cost estimates for the on-condition actions specified in this AD. The FAA estimates it takes up to 1.5 hours to replace one sensor. 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. <HD SOURCE="HD1">Authority for This Rulemaking</HD> 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 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 25k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━