AD 99-09-12 Airworthiness Directives; British Aerospace (Jetstream) Model 4101 Airplanes

Models named: 4101. Read the applicability below — it usually turns on serial or part numbers too.

Jetstream Model 4101 airplanes, excluding those on which Jetstream Modifications JM41575B and JM41575C have been accomplished, certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise 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 (c) 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, unless accomplished previously. To prevent fatigue cracking in the structure that attaches the flap nacelle fairing to the wing flaps, which could result in the partial or complete separation of the fairing from the wing flap, and consequent additional structural damage to the airframe and/or reduced controllability of the airplane, accomplish the following: (a) Prior to the accumulation of 1,500 total hours time-in- service, or within 60 days after the effective date of this AD, whichever occurs later, accomplish the requirements of paragraphs (a)(1), (a)(2), and (a)(3) of this AD. (1) Perform a detailed visual inspection to detect discrepancies [cracks, loose rivets and Jo-Bolts, chafing damage at the flap trailing edge, and installation of nonstandard parts (as defined in Figure 1. of Jetstream Alert Service Bulletin J41-A57-015, Revision 1, dated August 23, 1996, or Revision 2, dated June 30, 1997)] and previous repairs of the flap structure that attaches the flap nacelle fairing to each wing flap; in accordance with Jetstream Alert Service Bulletin J41-A57-015, Revision 1, dated August 23, 1996, or Revision 2, dated June 30, 1997. Repeat the inspection thereafter at intervals not to exceed 1,500 hours time-in-service until the requirements of paragraph (b) of this AD have been accomplished. (i) Except as provided by paragraph (a)(1)(ii) of this AD, if any discrepancy is found, prior to further flight, perform corrective action in accordance with Revision 1 or Revision 2 of the alert service bulletin. (ii) If any discrepancy is found for which Revision 1 or Revision 2 of the alert service bulletin specifies to contact the manufacturer to obtain a repair scheme: Prior to further flight, repair in accordance with a method approved by either the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate; or the Civil Aviation Authority (or its delegated agent). (2) Drill a drain hole in the flap nacelle fairing on each wing flap, in accordance with Jetstream Alert Service Bulletin J41-A57- 015, dated May 27, 1996, Revision 1, dated August 23, 1996, or Revision 2, dated June 30, 1997. (3) Apply new primer and sealant to the gap between the wing flap and flap nacelle fairing, in accordance with Jetstream Alert Service Bulletin J41-A57-015, Revision 1, dated August 23, 1996, or Revision 2, dated June 30, 1997. (b) Within 3,000 hours time-in-service after the effective date of this AD: Modify the wing flap structure in accordance with Jetstream Service Bulletin J41-57-017, dated May 9, 1997. Accomplishment of this modification constitutes terminating action for the repetitive inspection requirements of this AD. Alternative Methods of Compliance (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, International Branch, ANM-116. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, International Branch, ANM-116. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116. Special Flight Permits (d) 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. Incorporation by Reference (e) Except as provided by paragraph (a)(1)(ii) of this AD, the actions shall be done in accordance with Jetstream Service Bulletin J41-57-017, dated May 9, 1997; Jetstream Alert Service Bulletin J41- A57-015, Revision 1, dated August 23, 1996; and Jetstream Alert Service Bulletin J41-A57-015, Revision 2, dated June 30, 1997, which contains the following list of effective pages: [[Page 20152]] ------------------------------------------------------------------------ Revision level Page No. shown on Date shown on page page ------------------------------------------------------------------------ 1-3............................... 2 June 30, 1997. 2, 4-9............................ 1 Aug. 23, 1996. ------------------------------------------------------------------------ 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 AI(R) American Support, Inc., 13850 Mclearen Road, Herndon, Virginia 20171. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; 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 airworthiness directive 006-05-96. (f) This amendment becomes effective on June 1, 1999. Issued in Renton, Washington, on April 19, 1999. D. L. Riggin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-10180 Filed 4-23-99; 8:45 am] BILLING CODE 4910-13-P