AD 99-25-16 Airworthiness Directives; Fokker Model F27 Mark 050 Series Airplanes

Models named: F27 Mark 050 series. Read the applicability below — it usually turns on serial or part numbers too.

Model F27 Mark 050 series airplanes, serial numbers 20103 through 20258 inclusive, 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 (b) 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 failure of the seat attach fittings due to shim material deterioration, which could result in injury to the airplane occupants, accomplish the following: Modification (a) Within 6 months after the effective date of this AD, accomplish the requirements of paragraphs (a)(1), (a)(2), and (a)(3), as applicable. (1) For all airplanes: Remove the tapered shims installed under the seat rails from fuselage station 14025 to the aft end of the seat rails, and install shorter bolts, in accordance with Fokker 50 Service Bulletin SBF50-25-045, dated February 3, 1994. (2) For airplanes having serial numbers 20182, 20192, 20202, 20210, and 20220, in which a galley 2A is installed on the seat rails between fuselage stations 15503 and 15839 (left position) and galley 2B is installed on the seat rails between stations 16039 and 16375 (right position): Install shims under the galleys in accordance with Fokker 50 Service Bulletin SBF50-25-045, dated February 3, 1994. (3) For airplanes having serial numbers 20234 and 20235, in which the aft cabin partition walls are installed on top of the stowage boxes, which are part of the seat box assemblies: Install a shim under each partition wall in accordance with Fokker 50 Service Bulletin SBF50-25-045, dated February 3, 1994. Alternative Methods of Compliance (b) 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 Manager, International Branch, ANM-116. Special Flight Permits (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. Incorporation by Reference (d) The actions shall be done in accordance with Fokker 50 Service Bulletin SBF50-25-045, dated February 3, 1994. 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 94-033 (A), dated February 21, 1994. (e) This amendment becomes effective on December 28, 1999. Issued in Renton, Washington, on December 3, 1999. D.L. Riggin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-31878 Filed 12-10-99; 8:45 am] BILLING CODE 4910-13-P