62-02-03\tBOEING: Amdt 389 Part 507 Federal Register January 19, 1962. Applies to Models 707 and 720 Series Airplanes Which Have Not Previously Been Modified In Accordance With Boeing Service Bulletin No. 1359, Dated June 30, 1961, (Service Bulletin No. 1359 Contains a List of Such Airplanes), and to Model 707 Airplanes on Which Retractable Dump Chutes Have Been Installed Per Boeing Service Bulletin No. 1200. \n\tCompliance required as indicated. \n\tIn order to prevent leakage through the secondary seal of the fuel dump chute when fuel is allowed to enter the manifold for any reason, the following modification shall be accomplished within 3,250 hours' time in service after the effective date of this directive: \n\tRemove the secondary fuel seal assembly, Boeing P/N 66-2538, and rebuild using new parts from Boeing kit, P/N 65-9566-1. Upon completion of the rebuilding, change the part number of secondary seal assembly to 69-16258-1. Use new "O" ring seal P/N MS29513-238 when installingsecondary seal assembly, P/N 69-16258-1. \n\t(Boeing Service Bulletin No. 1359, dated June 30, 1961, covers this modification.) \n\tThis directive effective February 20, 1962.