AD 98-26-05 Airworthiness Directives; British Aerospace (Operations) Limited Model B.121 Series 1, 2, and 3 Airplanes

Models named: B.121 Series 1, 2, 3. Read the applicability below — it usually turns on serial or part numbers too.

Model B.121 Series 1, 2, and 3 airplanes, all serial numbers, certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated in the body of this AD, unless already accomplished. To detect and correct cracks in the brake torque tube assemblies, which could result in reduced brake efficiency with possible reduced and/or loss of airplane control, accomplish the following: (a) Upon accumulating 3,300 hours time-in-service (TIS) on each brake torque tube assembly or within the next 100 hours TIS after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 600 hours TIS, visually inspect each brake torque tube assembly for cracks. Accomplish this inspection in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Jetstream Aircraft Ltd. PUP Service Bulletin No. B121/ 103, ORIGINAL ISSUE: October 26, 1995. (b) If a crack(s) is found during any inspection required by paragraphs (a) or (b)(2) of this AD, prior to further flight, accomplish the following: (1) Obtain repair instructions from the manufacturer through the FAA, Small Airplane Directorate, at the address specified in paragraph (d) of this AD; and (2) Incorporate these repair instructions, and continue to reinspect at intervals not to exceed 600 hours TIS. (c) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (d) An alternative method of compliance or adjustment of the initial or repetitive compliance times that provides an equivalent level of safety may be approved by the Manager, Small Airplane Directorate, 1201 Walnut, suite 900, Kansas City, Missouri 64106. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Small Airplane Directorate. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Small Airplane Directorate. (e) Questions or technical information related to Jetstream Aircraft Ltd. PUP Service Bulletin No. B121/103, ORIGINAL ISSUE: October 26, 1995, should be directed to British Aerospace (Operations) Limited, British Aerospace Regional Aircraft, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland; telephone: (01292) 479888; facsimile: (01292) 479703. This service information may be examined at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. (f) The inspection required by this AD shall be done in accordance with Jetstream Aircraft Ltd. PUP Service Bulletin No. B121/103, ORIGINAL ISSUE: October 26, 1995. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from British Aerospace (Operations) Limited, British Aerospace Regional Aircraft, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland. Copies may be inspected at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC. Note 3: The subject of this AD is addressed in British AD 003- 10-95, not dated. (g) This amendment becomes effective on January 29, 1999. [[Page 70001]] Issued in Kansas City, Missouri, on December 9, 1998. Marvin R. Nuss, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-33244 Filed 12-17-98; 8:45 am] BILLING CODE 4910-13-P