AD 2007-21-17 Airworthiness Directives; British Aerospace Regional Aircraft Model HP.137 Jetstream Mk.1, Jetstream Series 200, Jetstream Series 3101, and Jetstream Model 3201 Airplanes

Models named: 3201. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to HP.137 Jetstream Mk.1, Jetstream Series 200, Jetstream Series 3101, and Jetstream Model 3201 airplanes, all serial numbers, certificated in any category. (d) Air Transport Association of America (ATA) Code 32: Landing Gear. Reason (e) The mandatory continuing airworthiness information (MCAI) states: There has been a report of landing gear radius rods suffering cracks starting in the flashline near the microswitch boss. Such cracks can result in loss of the normal hydraulic system and may lead to a landing gear collapse. Main landing gear collapse is considered as potentially hazardous/catastrophic. This AD mandates additional inspections considered necessary to address the identified unsafe condition. Note: The cause of this cracking is not related to previous cracking of the radius rod cylinder addressed by BAE Systems SB 32-JA040945 (CAA AD G-2005-0010), however, the consequences of a failure are the same.

Unless already done, do the following actions: (1) Initially within the next 3 months after November 28, 2007 (the effective date of this AD) and repetitively thereafter at intervals not to exceed 12 months until the replacement required by paragraph (f)(2) or (f)(3) of this AD is done, inspect the main landing gear radius rod forged cylinder flashline following the accomplishment instructions of British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006. (2) If cracks are found during any inspection required by this AD, before further flight, replace the radius rod assembly with a serviceable unit. (i) If the radius rod assembly includes the parts described in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, then the repetitive inspections of this AD are no longer required. (ii) If the radius rod assembly does not include the parts described in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, then continue to repetitively inspect at intervals not to exceed 12 months until you comply with paragraph (f)(3) of this AD. (3) Upon reaching 8,000 total landings on the main landing gear radius rods or within the next 12 months November 28, 2007(the effective date of this AD), whichever occurs later, replace the radius rod assembly by installing one of the following part numbers (P/N). This terminates the repetitive inspection requirement of this AD: (i) P/N 1847/A to 1847/L with strike-off 12 or 13, or 1847/M or later; and (ii) P/N 1862/A to 1862/L with strike-off 12 or 13, or 1862/M or later. (4) For airplanes under 8,000 total landings on the main landing gear radius rods: Before further flight after the initial inspection required by paragraph (f)(1) of this AD, do not install a radius rod assembly that is not one of the parts specified in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD on an affected airplane, unless it has been inspected in accordance with paragraph (f)(1) of this AD. (5) For those airplanes with parts listed in paragraph (f)(3) of this AD: Before further flight after installing the parts in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, do not install any radius rod assembly that does not incorporate the parts in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD. Note 1: When a compliance time in this AD is presented in landings and you do not keep the total landings, you may multiply the total number of airplane hours time-in-service by 0.75 to calculate the number of landings for the purposes of doing the actions required by this AD. Note 2: Maintenance procedures for each radius rod overhaul are included in APPH Service Bulletin 1847-32-12 or 1862-32-12, both dated September 2006, as applicable. You may do such maintenance using the above referenced bulletins or through a fluorescent dye penetrant inspection of the cylinder counterbore as specified in APPH Component Maintenance Manual (CMM) 32-10-16 at Revision 11 or higher. FAA AD Differences Note 3: This AD differs from the MCAI and/or service information as follows: (1) The MCAI and service bulletin allow the radius rod assembly to be repetitively inspected for the life of the airplane and the repetitive inspection requirement is terminated if improved design parts are installed. Many of the affected airplanes are used in commuter operations (14 CFR part 135). The FAA's policy on aging commuter class aircraft states that when a modification exists that could eliminate or reduce the number of required critical inspections, the modification should be incorporated. Therefore, the FAA is mandating the replacement of the radius rod assembly with improved design parts no later than reaching 8,000 total landings on the main landing gear radius rods or within the next 12 months after the effective date of this AD, whichever occurs later. (2) The MCAI includes a reference to APPH service bulletins as an option for maintenance overhaul procedures. Because we do not require general maintenance in our ADs, we added a note referencing these bulletins as an option to use for overhaul procedures. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Standards Staff, 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: Taylor Martin, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4138; fax: (816) 329-4090. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (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 European Aviation Safety Agency (EASA) AD No. 2007-0087, dated March 30, 2007; and BAE SYSTEMS Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006; for related information. Material Incorporated by Reference (i) You must use BAE SYSTEMS Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006 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 British Aerospace (Operations) Limited Trading at British Aerospace Regional Aircraft, Prestwick International Airport, Ayrshire KA9 2RW, Scotland. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; or 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/cfr/ibr-locations.html . Issued in Kansas City, Missouri, on October 10, 2007. David R. Showers, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-20364 Filed 10-23-07; 8:45 am] BILLING CODE 4910-13-P

Unless already done, do the following actions: (1) Initially within the next 3 months after November 28, 2007 (the effective date of this AD) and repetitively thereafter at intervals not to exceed 12 months until the replacement required by paragraph (f)(2) or (f)(3) of this AD is done, inspect the main landing gear radius rod forged cylinder flashline following the accomplishment instructions of British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006. (2) If cracks are found during any inspection required by this AD, before further flight, replace the radius rod assembly with a serviceable unit. (i) If the radius rod assembly includes the parts described in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, then the repetitive inspections of this AD are no longer required. (ii) If the radius rod assembly does not include the parts described in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, then continue to repetitively inspect at intervals not to exceed 12 months until you comply with paragraph (f)(3) of this AD. (3) Upon reaching 8,000 total landings on the main landing gear radius rods or within the next 12 months November 28, 2007(the effective date of this AD), whichever occurs later, replace the radius rod assembly by installing one of the following part numbers (P/N). This terminates the repetitive inspection requirement of this AD: (i) P/N 1847/A to 1847/L with strike-off 12 or 13, or 1847/M or later; and (ii) P/N 1862/A to 1862/L with strike-off 12 or 13, or 1862/M or later. (4) For airplanes under 8,000 total landings on the main landing gear radius rods: Before further flight after the initial inspection required by paragraph (f)(1) of this AD, do not install a radius rod assembly that is not one of the parts specified in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD on an affected airplane, unless it has been inspected in accordance with paragraph (f)(1) of this AD. (5) For those airplanes with parts listed in paragraph (f)(3) of this AD: Before further flight after installing the parts in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, do not install any radius rod assembly that does not incorporate the parts in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD. Note 1: When a compliance time in this AD is presented in landings and you do not keep the total landings, you may multiply the total number of airplane hours time-in-service by 0.75 to calculate the number of landings for the purposes of doing the actions required by this AD. Note 2: Maintenance procedures for each radius rod overhaul are included in APPH Service Bulletin 1847-32-12 or 1862-32-12, both dated September 2006, as applicable. You may do such maintenance using the above referenced bulletins or through a fluorescent dye penetrant inspection of the cylinder counterbore as specified in APPH Component Maintenance Manual (CMM) 32-10-16 at Revision 11 or higher. FAA AD Differences Note 3: This AD differs from the MCAI and/or service information as follows: (1) The MCAI and service bulletin allow the radius rod assembly to be repetitively inspected for the life of the airplane and the repetitive inspection requirement is terminated if improved design parts are installed. Many of the affected airplanes are used in commuter operations (14 CFR part 135). The FAA's policy on aging commuter class aircraft states that when a modification exists that could eliminate or reduce the number of required critical inspections, the modification should be incorporated. Therefore, the FAA is mandating the replacement of the radius rod assembly with improved design parts no later than reaching 8,000 total landings on the main landing gear radius rods or within the next 12 months after the effective date of this AD, whichever occurs later. (2) The MCAI includes a reference to APPH service bulletins as an option for maintenance overhaul procedures. Because we do not require general maintenance in our ADs, we added a note referencing these bulletins as an option to use for overhaul procedures. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Standards Staff, 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: Taylor Martin, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4138; fax: (816) 329-4090. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (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 European Aviation Safety Agency (EASA) AD No. 2007-0087, dated March 30, 2007; and BAE SYSTEMS Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006; for related information. Material Incorporated by Reference (i) You must use BAE SYSTEMS Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006 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 British Aerospace (Operations) Limited Trading at British Aerospace Regional Aircraft, Prestwick International Airport, Ayrshire KA9 2RW, Scotland. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; or 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/cfr/ibr-locations.html . Issued in Kansas City, Missouri, on October 10, 2007. David R. Showers, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-20364 Filed 10-23-07; 8:45 am] BILLING CODE 4910-13-P