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Aerospace. Test methods for polytetrafluoroethylene (PTFE) inner-tube hose assemblies - Non-metallic braid Ingestion-build-63114 and chimneys about1 Scope This part of ISO 8829 specifies test methods for flexible polytetrafluoroethylene (PTFE) inner tubes with non metallic braided hose and hose assemblies used in aircraft fluid systems, in the pressure and temperature ranges covered by pressure classes and temperature types, as specified in ISO 6771. This part of ISO 8829 applies to the hose and the hose coupling. The tests and assembly requirements for the connecting end fittings are covered in