AD 99-15-03 Airworthiness Directives; Stemme GmbH & Co. KG Model S10-VT Sailplanes

Model S10-VT sailplanes, serial numbers 11-004 through 11-006 and 11-008 through 11-013, certificated in any category. Note 1: This AD applies to each sailplane 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 sailplanes 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 within the next 3 calendar months after the effective date of this AD, unless already accomplished. To prevent the wastegate control from malfunctioning because of heat damage, which could result in loss of automatic manifold pressure control and engine damage, accomplish the following: (a) Modify the wastegate control in order to eliminate heat damage, in accordance with the Instructions section of Stemme Service Bulletin No. A31-10-034, Amendment 01.a, pages 3 and 4, dated July 24, 1998. (b) Special flight permits may be issued in accordance with Secs. 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the sailplane to a location where the requirements of this AD can be accomplished. (c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Small Airplane Directorate, FAA, 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. (d) Questions or technical information related to Stemme Service Bulletin No. A31-10-034, Amendment 01.a, dated July 24, 1998, should be directed to Stemme GmbH & Co. KG, Gustav-Meyer-Allee 25, D-13355 Berlin, Germany; telephone: 49.33.41.31.11.70; facsimile: 49.33.41.31.11.73. 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. (e) The modification required by this AD shall be done in accordance with Stemme GmbH & Co. KG Service Bulletin No. A31-10- 034, Amendment 01.a, pages 3 and 4, dated July 24, 1998. 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 Stemme GmbH & Co. KG, Gustav-Meyer- Allee 25, D-13355 Berlin, Germany. 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 German AD 1998- 400, dated October 22, 1998. (f) This amendment becomes effective on August 31, 1999. Issued in Kansas City, Missouri, on July 2, 1999. Marvin R. Nuss, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-17677 Filed 7-13-99; 8:45 am] BILLING CODE 4910-13-U