99-27-13: Elevators, Rudder, and Ailerons

99-27-13 FOKKER SERVICES B.V.: Amendment 39-11494. Docket 99-NM-236-AD. Issued December 28, 1999. Applicability: All Model F27 Mark 050 series airplanes, 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. Compliance: Required as indicated, unless accomplished previously. To prevent loose attachment screws on the leading edges of the elevators, rudder, and ailerons due to vibration, which could result in interference of the leading edges with adjacent structure and consequent reduced controllability of the airplane; accomplish the following: Repetitive Corrective Action (a) Within 30 days after the effective date of this AD, use a torque wrench to tighten the screws for the attachment of the leading edges of the elevators in accordance with Fokker Service Bulletin SBF50-55-007, dated June 5, 1998. Repeat the tightening thereafter at intervals not to exceed 12 months. (b) Within 24 months after the effective date of this AD, use a torque wrench to tighten the screws for the attachment of the leading edges of the rudder in accordance with Fokker Service Bulletin SBF50-55-009, Revision 1, dated July 23, 1999. Repeat the tightening thereafter at intervals not to exceed 4,000 flight hours or 24 months, whichever occurs first. (c) Within 6 months after the effective date of this AD, use a torque wrench to tighten the screws for the attachment of the leading edges of the ailerons in accordance with Fokker Service Bulletin SBF50-57-020, Revision 1, dated July 23, 1999. Repeat the tightening thereafter at intervals not to exceed 12 months. Alternative Methods of Compliance (d) 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, FAA, Transport Airplane Directorate. 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 (e) 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 (f) The actions shall be done in accordance with the following Fokker service bulletins, which contain the specified effective pages: Service Bulletin Referenced and Date Page Number Revision Level Shown on Page Date Shown on Page SBF50-55-007, June 5, 1998 1-5 Original June 5, 1998 SBF50-55-009, Revision 1, July 23, 1999 1-4, 7, 5, 6 1, Original July 23, 1999 SBF50-57-020, Revision 1, July 23, 1999 1-4, 6, 5, 7 1, Original July 23, 1999 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 Fokker Services B.V., P.O. Box 231, 2150 AE Nieuw-Vennep, The Netherlands. 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 Dutch airworthiness directive 1998-070/3, dated August 31, 1999. (g) This amendment becomes effective on January 21, 2000.