AD 2009-22-12 Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) Airplanes, Model CL-600-2D15 (Regional Jet Series 705) Airplanes, and Model CL-600-2D24 (Regional Jet Series 900) Airplanes

This AD applies to Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) airplanes, Model CL-600-2D15 (Regional Jet Series 705) airplanes, and Model CL-600-2D24 (Regional Jet Series 900) airplanes; certificated in any category, that are equipped with Thales angle of attack (AOA) transducers having part number C16258AA.

Unless already done, do the following actions. (1) Within the applicable compliance times specified in Table 1 of this AD: Measure the inrush current of both AOA transducers, in accordance with Part A of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009. Table 1—Initial Measurement For any AOA transducer that, as of the effective date of this AD, has accumulated— Do the initial inrush current measurement— Less than 6,500 total flight hours Before the AOA transducer has accumulated 7,500 total flight hours. More than or equal to 6,500 total flight hours but less than 7,500 total flight hours Within 500 flight hours after the effective date of this AD but before the AOA transducer has accumulated 8,000 total flight hours. More than or equal to 7,500 total flight hours Within 250 flight hours after the effective date of this AD. (2) If, during any measurement required by paragraph (f)(1) of this AD, an AOA transducer is found to have an inrush current less than 1.60 amps (“degraded” transducer), before further flight replace the transducer with a new or serviceable transducer, in accordance with Part C of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009. Do the measurement specified in paragraph (f)(1) of this AD for that replacement transducer at the times specified in (f)(2)(i) or (f)(2)(ii) of this AD. (i) At the applicable time specified in Table 2 of this AD if the degraded transducer was replaced with a serviceable transducer that is not new; or (ii) Within 2,000 flight hours after replacement if the degraded transducer was replaced with a new one. (3) If, during any measurement required by paragraph (f)(1) of this AD, an AOA transducer is found to have an inrush current more than or equal to 1.60 amps, repeat the measurement specified in paragraph (f)(1) of this AD thereafter at intervals not to exceed the applicable interval specified in Table 2 of this AD. Table 2—Repetitive Measurement Intervals If the last inrush current measurement of the serviceable AOA transducer is— Then repeat the measurement— More than or equal to 1.90 amps Within 2,000 flight hours after the last measurement. More than or equal to 1.80 amps but less than 1.90 amps Within 1,500 flight hours after the last measurement. More than or equal to 1.70 amps but less than 1.80 amps Within 1,000 flight hours after the last measurement. More than or equal to 1.60 amps but less than 1.70 amps Within 500 flight hours after the last measurement. FAA AD Differences Note: This AD differs from the MCAI and/or service information as follows: This AD does not require the one-time inspection for serial numbers and on-condition replacement in Paragraph 1. of the MCAI. The planned compliance times for this action would allow enough time to provide notice and opportunity for prior public comment on the merits of those actions. Therefore, we are considering further rulemaking to address this issue. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to Attn: Wing Chan, Aerospace Engineer, Avionics and Flight Test Branch, ANE-172, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7311; fax (516) 794-5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD. (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 (h) Refer to MCAI Canadian Airworthiness Directive CF-2009-35, dated August 31, 2009; and Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009; for related information. Material Incorporated by Reference (i) You must use Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009, to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this 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. (3) You may review copies of the 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 or 425-227-1152. (4) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Issued in Renton, Washington, on October 16, 2009. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E9-25917 Filed 10-28-09; 8:45 am] BILLING CODE 4910-13-P

Unless already done, do the following actions. (1) Within the applicable compliance times specified in Table 1 of this AD: Measure the inrush current of both AOA transducers, in accordance with Part A of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009. Table 1—Initial Measurement For any AOA transducer that, as of the effective date of this AD, has accumulated— Do the initial inrush current measurement— Less than 6,500 total flight hours Before the AOA transducer has accumulated 7,500 total flight hours. More than or equal to 6,500 total flight hours but less than 7,500 total flight hours Within 500 flight hours after the effective date of this AD but before the AOA transducer has accumulated 8,000 total flight hours. More than or equal to 7,500 total flight hours Within 250 flight hours after the effective date of this AD. (2) If, during any measurement required by paragraph (f)(1) of this AD, an AOA transducer is found to have an inrush current less than 1.60 amps (“degraded” transducer), before further flight replace the transducer with a new or serviceable transducer, in accordance with Part C of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009. Do the measurement specified in paragraph (f)(1) of this AD for that replacement transducer at the times specified in (f)(2)(i) or (f)(2)(ii) of this AD. (i) At the applicable time specified in Table 2 of this AD if the degraded transducer was replaced with a serviceable transducer that is not new; or (ii) Within 2,000 flight hours after replacement if the degraded transducer was replaced with a new one. (3) If, during any measurement required by paragraph (f)(1) of this AD, an AOA transducer is found to have an inrush current more than or equal to 1.60 amps, repeat the measurement specified in paragraph (f)(1) of this AD thereafter at intervals not to exceed the applicable interval specified in Table 2 of this AD. Table 2—Repetitive Measurement Intervals If the last inrush current measurement of the serviceable AOA transducer is— Then repeat the measurement— More than or equal to 1.90 amps Within 2,000 flight hours after the last measurement. More than or equal to 1.80 amps but less than 1.90 amps Within 1,500 flight hours after the last measurement. More than or equal to 1.70 amps but less than 1.80 amps Within 1,000 flight hours after the last measurement. More than or equal to 1.60 amps but less than 1.70 amps Within 500 flight hours after the last measurement. FAA AD Differences Note: This AD differs from the MCAI and/or service information as follows: This AD does not require the one-time inspection for serial numbers and on-condition replacement in Paragraph 1. of the MCAI. The planned compliance times for this action would allow enough time to provide notice and opportunity for prior public comment on the merits of those actions. Therefore, we are considering further rulemaking to address this issue. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to Attn: Wing Chan, Aerospace Engineer, Avionics and Flight Test Branch, ANE-172, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7311; fax (516) 794-5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD. (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 (h) Refer to MCAI Canadian Airworthiness Directive CF-2009-35, dated August 31, 2009; and Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009; for related information. Material Incorporated by Reference (i) You must use Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009, to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this 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. (3) You may review copies of the 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 or 425-227-1152. (4) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Issued in Renton, Washington, on October 16, 2009. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E9-25917 Filed 10-28-09; 8:45 am] BILLING CODE 4910-13-P