60-11-01\tBOEING: Amdt 158 Part 507 Federal Register May 24, 1960. Applies to the following 707-200 and -300 Series Airplanes And All Spare Quick Change Engine Build-up Units Which May Be Available. Serial Numbers 17592 Through 17606, 17613 Through 17618, 17623 Through 17626, 17673 Through 17684, And 17692 Through 17695. Boeing will incorporate the modification required by this airworthiness directive on all production airplanes other than those listed above. \n\tCompliance required by July 1, 1960. \n\tAs a result of several failures which have occurred to the engine nose dome installation of the Boeing 707-300 series airplanes resulting in major engine failures, inspections and modifications to the nose dome attaching means is required. To preclude further difficulty the following shall be accomplished as indicated: \n\t(a)\tInspect and rework each engine nose dome and attachment in accordance with the information included in Boeing Service Bulletin No. 799 dated January 28, 1960.(b)\tRework the nose dome stub and bolt, Boeing P/N's 66-2079 or 66-2078 and 66-2075 in accordance with the instructions contained in Boeing Service Bulletin No. 790 dated January 27, 1960.