87-18-01: Horizontal Stabilizer Control Unit

87-18-01 FOKKER B.V.: Amendment 39-5719. Applies to Model F28 airplanes certificated in any category, serial numbers 11003 through 11195, 11991, and 11992. Compliance required as indicated, unless previously accomplished. To prevent uncommanded movement of the horizontal stabilizer as a result of fatigue failure of certain bolts within the horizontal stabilizer control unit, accomplish the following within one year after the effective date of this AD: A. Replace the horizontal stabilizer control unit in accordance with the Accomplishment Instructions in Fokker Service Bulletin No. F28/F27-168, Revision 1, dated June 30, 1986. B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base forthe accomplishment of the modifications required by this AD. All persons affected by this directive who have not already received the appropriate service document from the manufacturer may obtain copies upon request to Fokker Aircraft, 1199 North Fairfax Street, Alexandria, Virginia 22314. This document may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. This amendment becomes effective October 7, 1987.