67-14-02 BOEING: Amdt. 39-404 Part 39 Federal Register April 29, 1967. Applies to Model 727 Series Airplanes. \n\n\tCompliance required as indicated unless already accomplished. \n\n\tTo protect the aircraft structure in the event of an excessively hard landing by providing the desired separation characteristics of the main landing gear side strut, accomplish the following: \n\n\t(a)\tWithin the next 1,000 hours' time in service after the effective date of this AD replace the main landing gear side strut lower segment plugs and side strut universal fittings in accordance with the appropriate accomplishment instruction outlined in the section entitled "II". Accomplishment Instructions (PRR21974 and 22392)", of Boeing Service Bulletin No. 32-79, Revision 1, or later FAA-approved revision, or by an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t(b)\tWithin the next 6,000 hours' time in service after the effective date of this AD incorporate the controlled groove around the outside upper end of the side strut lower segment in accordance with the appropriate accomplishment instructions outlined in the section entitled "II". Accomplishment Instructions (PRR 21974) and 22392)", of Boeing Service Bulletin No. 32-79, Revision 1, or later FAA-approved revision, or by an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis directive effective May 2, 1967. \n\n\tRevised May 19, 1967.