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Aircraft Wiring Practices
Wiring OverviewPhysical Properties Age
Wire DegradationEnvironment Maintenance
Installation
Causes of Wiring DegradationVibration
Moisture
Maintenance
Causes of Wiring Degradation, cont.Indirect damage Chemical contamination Heat Installation
Current FAA Guidance25.1301/1309 25.1529 25.1353
25.869
Wiring Practices
Policy memo
AC 43.13-1b
AC 25-16
AC 25-10
Wire SelectionSize wires so they:
Have sufficient mechanical strength Do not exceed allowable voltage drop levels Are protected by circuit protection devices Meet circuit current-carrying requirements
Wire SelectionConductor stranding
Minimizes fatigue breakage
Platings for all copper aircraft wiring
Plated because bare copper develops surface oxide film -- a poor conductor
Tin