scope:

Abstract:

The Sea Winds test program demonstrated that semi-rigid coaxial RF cable failures are difficult to avoid. Semi-rigid RF cable failures often cannot be detected by visual examination. During inspections following vibration test of the Sea Winds SES, hairline cracks were missed several times. Testing of protoflight models (PFMs) may permit only in-situ visual examination of components, while structural mass model (STM) tests typically allow cables to be removed from the unit for close examination. After a cable assembly passes environmental test, a second "identical" cable may fail due to minor differences in manufacture and installation. Consider using flexible cable. Where semirigid cabling is preferred, the lesson recommends standardization of cable receiving inspection, assembly, and installation. It also suggests several cable installation and test measures.