79-20-06 BOEING: Amendment 39-3581. Applies to Model 727 series airplanes, certificated in all categories, line numbers 1 through 1361 inclusive.\n \n\tCompliance required within 60 days from the effective date of this AD, unless already accomplished. \n\tTo protect the aircraft structure in the event of an excessively hard landing by providing the desired separation characteristics of the main landing side strut, accomplish the inspection of the side strut assemblies (2 per airplane) for correct installation in accordance with Boeing Service Bulletin No. 727-32-268, Revision 1, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. If incorrect parts are found installed, remove the affected part and install a correct part prior to further flight. \n\tReport findings of incorrect installation to the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. (Reporting approved by the Bureau of Budget under BOB No. 04-R0174.) \n\tThe manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). \n\tAll persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. \n\n\tThis amendment becomes effective October 11, 1979.