FAA Aircraft Wiring Practices

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