Aviation Cable Maintenance and Testing Methods
I. Testing Methods
Continuity and Insulation Resistance Testing
Use wiring harness testers or digital testing equipment to verify continuity, short circuits, insulation resistance, and voltage withstand performance, ensuring no open circuits, short circuits, and compliance with design specifications for insulation resistance23。
Continuity tests confirm correct cable connections, while insulation resistance must meet megohm-level standards38。
Environmental Simulation Testing
Simulate high-altitude low pressure, extreme temperatures (-40°C to 70°C), and humidity (10% to 95%) to evaluate electrical performance, signal stability, and material integrity8。
Non-Destructive Testing (NDT) Techniques
Infrared Thermography: Detect temperature distribution to identify overheating or latent faults4。
Ultrasonic Testing: Analyze internal structural anomalies, such as conductor breaks or insulation layer damage7。
Voltage Withstand Testing
Verify cable tolerance under high voltage to ensure compliance with aircraft design requirements38。
II. Maintenance Methods
Regular Inspection and Cleaning
Visual Inspection: Check for sheath damage, shield layer fractures, connector corrosion, etc.56。
Cleaning: Remove contaminants with mild cleaners to prevent salt fog or oil corrosion67。
Protection and Installation Optimization
Conduit Installation: Use protective sleeves (e.g., PVC or metal conduits) to secure cables and minimize wear or electromagnetic interference5。
Avoid Over-Bending: Reserve sufficient cable length to prevent stretching and damage to conductors or insulation6。
Environmental Adaptability Maintenance
Control temperature and humidity in cable environments to prevent insulation aging (from heat) or short circuits (from moisture)58。
Fault Repair and Replacement
Replace cables immediately if insulation aging or broken strands are detected, or use professional repair techniques like heat-shrink tubing sealing