# 75 FR 43882: Airworthiness Directives; Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) Airplanes > Federal · Regulations · In force URL: https://www.frixlaw.com/law-library/statutes/FR_PRORULE_2010-18291 ## Section - **Citation:** 75 FR 43882 - **Heading:** Airworthiness Directives; Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) Airplanes - **Jurisdiction:** Federal - **Kind:** Regulations - **Status:** In force - **Text as of:** August 14, 2026 - **Source:** Compiled text - **Location:** Federal Register / Vol. 75 / 75 FR 43882 ## Text 0. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: (202) 493-2251. • Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-40, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Bombardier, Inc., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; e-mail thd.crj@aero.bombardier.com; Internet http://www.bombardier.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221. Examining the AD Docket You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Operations office (telephone (800) 647-5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Joseph Licata, Aerospace Engineer, Avionics and Flight Test Branch, ANE-172, FAA, New York Aircraft Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7361; fax (516) 794-5531. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD INFORMATION CONTACT: Joseph Licata, Aerospace Engineer, Avionics and Flight Test Branch, ANE-172, FAA, New York Aircraft Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7361; fax (516) 794-5531. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include “Docket No. FAA-2010-0700; Directorate Identifier 2010-NM-123-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD based on those comments. We have lengthened the 30-day comment period for proposed ADs that address MCAI originated by aviation authorities of other countries to provide adequate time for interested parties to submit comments. The comment period for these proposed ADs is now typically 45 days, which is consistent with the comment period for domestic transport ADs. We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. Discussion Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian Airworthiness Directive CF-2010-13, dated May 6, 2010 (referred to after this as “the MCAI”), to correct an unsafe condition for the specified products. The MCAI states: The manufacturer has informed Transport Canada that a certain number of the resolver stators, which were installed in the angle of attack (AOA) transducers, were not cleaned correctly on authority for Canada, has issued Canadian Airworthiness Directive CF-2010-13, dated May 6, 2010 (referred to after this as “the MCAI”), to correct an unsafe condition for the specified products. The MCAI states: The manufacturer has informed Transport Canada that a certain number of the resolver stators, which were installed in the angle of attack (AOA) transducers, were not cleaned correctly. This condition can degrade the AOA transducer performance at low temperatures resulting in freezing of the AOA transducer resolver, which may provide inaccurate AOA data to the Stall Protection System (SPS). If not corrected, this condition can result in early or late activation of the stick shaker and/or stick pusher. These conditions could result in reduced ability of the flight crew to maintain a safe flight and landing of the airplane. The required actions include an inspection to determine if certain AOA transducers are installed and replacement of affected transducers. You may obtain further information by examining the MCAI in the AD docket. Relevant Service Information Bombardier has issued Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. FAA's Determination and Requirements of This Proposed AD This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to our bilateral agreement with the State of Design Authority, we have been notified of the unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design. Differences Between This AD and the MCAI or Service Information We have reviewed the MCAI and related service information and, in general, agree with their substance d service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design. Differences Between This AD and the MCAI or Service Information We have reviewed the MCAI and related service information and, in general, agree with their substance. But We might also have proposed different actions in this AD from those in the MCAI in order to follow FAA policies. Any such differences are highlighted in a NOTE within the proposed AD. Costs of Compliance Based on the service information, we estimate that this proposed AD would affect about 380 products of U.S. registry. We also estimate that it would take about 1 work-hour per product to comply with the basic requirements of this proposed AD. The average labor rate is $85 per work-hour. Based on these figures, we estimate the cost of the proposed AD on U.S. operators to be $32,300, or $85 per product. 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. We are 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 We determined that this proposed AD would not have federalism implications under Executive Order 13132 ctices, 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 We determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation: 1. Is not a “significant regulatory action” under Executive Order 12866; 2. Is not a “significant rule” under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 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. We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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 AD: Bombardier, Inc.: Docket No. FAA-2010-0700; Directorate Identifier 2010-NM-123-AD. Comments Due Date (a) We must receive comments by September 10, 2010. Affected ADs (b) None. Applicability IVES 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 AD: Bombardier, Inc.: Docket No. FAA-2010-0700; Directorate Identifier 2010-NM-123-AD. Comments Due Date (a) We must receive comments by September 10, 2010. Affected ADs (b) None. Applicability (c) This AD applies to Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) airplanes, certificated in any category, equipped with Thales angle of attack transducers having part number (P/N) C16258AA. Subject (d) Air Transport Association (ATA) of America Code 27: Flight Controls. Reason (e) The mandatory continuing airworthiness information (MCAI) states: ``The manufacturer has informed Transport Canada that a certain number of the resolver stators, which were installed in the angle of attack (AOA) transducers, were not cleaned correctly. This condition can degrade the AOA transducer performance at low temperatures resulting in freezing of the AOA transducer resolver, which may provide inaccurate AOA data to the Stall Protection System (SPS). If not corrected, this condition can result in early or late activation of the stick shaker and/or stick pusher.'' These conditions could result in reduced ability of the flight crew to maintain a safe flight and landing of the airplane. Compliance (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Inspection ndition can result in early or late activation of the stick shaker and/or stick pusher.'' These conditions could result in reduced ability of the flight crew to maintain a safe flight and landing of the airplane. Compliance (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Inspection (g) Within 750 flight hours after the effective date of this AD, inspect the serial number of each AOA transducer having P/N C16258AA to determine if the serial number is identified in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010. A review of airplane maintenance records is acceptable in lieu of this inspection if the serial number of the AOA transducer can be conclusively determined from that review. (1) If the serial number is not listed in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, no further action is required by this AD other than compliance with paragraph (h) of this AD. (2) If the serial number is listed in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, and has the suffix “C”, no further action is required by this AD other than compliance with paragraph (h) of this AD. -27-054, Revision A, dated January 18, 2010, no further action is required by this AD other than compliance with paragraph (h) of this AD. (2) If the serial number is listed in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, and has the suffix “C”, no further action is required by this AD other than compliance with paragraph (h) of this AD. (3) If the serial number is listed in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, and does not have the suffix “C”, before further flight, replace the AOA transducer with a new or serviceable transducer, in accordance with Part C of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010. Note 1: To replace any AOA transducer, the replacement AOA transducer must either be outside of the affected serial numbers as identified in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, or have the suffix “C”. (h) As of the effective date of this AD, no AOA transducer having both a serial number and P/N C16258AA as identified in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, may be installed on any airplane unless the AOA transducer has been inspected by the manufacturer and identified with the suffix “C”. FAA AD Differences Note 2: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions A as identified in paragraph 1.A. of Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010, may be installed on any airplane unless the AOA transducer has been inspected by the manufacturer and identified with the suffix “C”. FAA AD Differences Note 2: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions (i) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq. ), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056. Related Information (j) Refer to MCAI Canadian Airworthiness Directive CF-2010-13, dated May 6, 2010; and Bombardier Alert Service Bulletin A670BA-27-054, Revision A, dated January 18, 2010; for related information. Issued in Renton, Washington, on July 16, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. 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Check the current official text before relying on it. Not legal advice.