61-08-02 RUPERT: Amendment 275 Part 507 Federal Register April 15, 1961 as amended by Amendment 39-2751. Applies to All Aircraft Equipped With Rupert Models 50, N50, 65, 80, and S-2194 Safety Belts, except those that contain Cam Clasps marked Cummings & Sander, Division of American Safety Equipment Corporation, P/N M 4090. \n\n\tCompliance required within the next 75 hours of time in service after the effective date of this AD. \n\n\tRecurring instances have been reported wherein Rupert belt assemblies have slipped under low tension loads. Accordingly, it has been determined by test the Rupert safety belt assemblies manufactured under Technical Standard Order C22 standards are deficient and must either be replaced with belt assemblies that conform to TSO-C22 standards or be reworked by accomplishing the following: \n\n\t(a) Remove all of the three bar slide length adjustors and replace them with new Rupert R-60 adjustors. Replacement adjustors will have thicknesses greater than 0.120. \n\n\t(b) Measure the distance between the crests of the outermost serrations on the tongue of the buckle. (See Figure 1.) If this distance measures 5/16 inch or less the buckle shall be reworked by replacing the tongue with one in which this distance is at least 3/8 inch. \n\n\t(Rupert Service Bulletin No. 101 covers this same subject.) \n\n\tAmendment 275 Part 507 Federal Register April 15, 1961 became effective May 16, 1961. \n\n\tThis Amendment 39-2751 becomes effective October 26, 1976.