BS 5G 178-1

BS 5G 178-1

Aircraft electrical wiring systems depend on numerous crimped terminations, which are subject to both mechanical and environmental stress over the entire service life of the aircraft, including temperature, vibration loading, humidity cycling, and repeated maintenance until the crimped wiring finishes its service life. BS 5G 178-1 establishes the design requirements and mechanical test methods governing crimped joint quality in aerospace electrical cable assemblies. Presto Stantest's precision pull-force testing machines, with controlled loading rate capability and high-resolution force measurement, are well-suited to BS 5G 178-1 crimp joint mechanical verification. 

Significance

A crimped joint that fails mechanically in an aircraft wiring harness can cause electrical open circuits in flight-critical systems—with potentially catastrophic consequences for aircraft safety. BS 5G 178-1 gives aerospace manufacturers, approved maintenance organizations, and wiring harness suppliers a validated, standardized basis for verifying that every crimped connection meets defined minimum pull-out force and joint integrity requirements before the assembly enters service.

Scope

BS 5G 178-1 covers design specifications and pull-force test procedures for crimped electrical joints in aircraft wiring, addressing conductor size range, terminal selection, crimp tool qualification, and the minimum mechanical performance requirements that completed crimp joints must satisfy under tensile loading conditions.