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Aviation cable in aircraft water systems

1. ​Electrical Cables​ (Primary Meaning)

• •​Purpose: Power and control for water system components:
  • •​Pumps: Transfer water from tanks to galleys/lavatories.
  • •​Heaters: Prevent freezing in water lines.
  • •​Solenoid Valves: Control water flow/drainage.
  • •​Sensors: Monitor tank levels, temperature, or leaks.
• •​Key Features:
  • •​Materials: Tinned copper conductors, PTFE/fiberglass insulation (lightweight, fire-resistant, high-temp rating).
  • •​Standards: FAA TSO-C56b/EASA ETSO-C56b (for stranded copper wire), MIL-W-22759 specs.
  • •​Shielding: EMI-resistant braided shielding to avoid interference with avionics.
  • •​Environmental Protection: Resistant to humidity, vibration, and potable water exposure.
• •​Safety: Redundant circuits, overcurrent protection, and insulation to prevent shorts.

2. ​Mechanical Control Cables​ (Less Common)

• •​Purpose: Manual operation of valves or drains in lavatories/galleys.
  • •Example: Pulling a handle to release wastewater.
• •​Design: Stainless steel cables with nylon/PVC sheathing for corrosion resistance and low friction.
• •​Placement: Typically in non-critical areas where mechanical simplicity is preferred over electronics.

​Key Considerations for Installation​

• •​Separation: Electrical cables must be routed away from water lines to prevent contamination if leaks occur.
• •​Sealing: Connectors use environmental seals (MIL-DTL-38999 spec) to block moisture ingress.
• •​Drainage: Cables are installed above fluid lines to avoid immersion.
• •​Weight Optimization: Aircraft-grade wires minimize mass (e.g., Kevlar-reinforced cables).

​Regulatory Compliance​

• •FAA/EASA mandates flame-retardant materials (FAR §25.1353, §25.863).
• •Compatibility with potable water systems per FAA AC 25-22.

​Common Issues​

• •Corrosion near leaks
• •Chafing due to vibration
• •Connector contamination causing electrical faults

​Bottom Line: “Aviation cables” in water systems are ​primarily electrical, enabling automation and monitoring of water management. Mechanical cables are auxiliary. Both demand strict compliance with aviation safety, weight, and reliability standards.