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Standards Development
This document specifies the material, configuration, dimensions, and surface-treatment requirements for test fixtures and process adapters used on tube assemblies. It also sets limits for lubrication, installation torque, and the number of reuse cycles.
Aerospace tube-fitting connectors are used extensively in aircraft hydraulic, fuel, lubrication and environmental-control systems, forming the aircraft’s “blood-vessel” network. Hydraulic lines for landing gear, actuators and wing-control surfaces operate at the highest pressures; their performance directly affects aircraft safety and is literally the aircraft’s lifeline.
Existing international standards for fittings — ISO 6772:2012 (impulse), ISO 6773:1994 (thermal shock), ISO 7257:2016 (rotary flexure) and ISO 9538:2017 (planar flexure) — prescribe detailed test methods but give no specific requirements for test-fixture design or connection details. Consequently, laboratories often lack clear guidance and may interpret setups differently.
Fixture design and quality strongly influence test accuracy and repeatability. In proof-pressure tests, poor sealing or incorrect assembly can cause leakage; in burst tests, inadequate geometry may create local stress concentrations and premature failure below expected pressures; in salt-spray tests, galvanic compatibility issues between fixture and fitting can accelerate corrosion and distort results. Different fixtures also produce different data, reducing inter-laboratory recognition and wasting test resources.
Because no universal standard for aerospace tube-fitting test fixtures exists, non-uniform designs, misinterpretation of test methods, inexperienced engineering, tight manufacturing tolerances and overengineering all threaten result validity and increase cost. A dedicated specification defining fixture materials, configuration, dimensions, surface treatment, lubrication, installation torque and reuse limits is urgently needed.
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