Which device is used to prevent a cable from rubbing on aircraft structure?

Which device is used to prevent a cable from rubbing on aircraft structure?

• A. Fairlead
• B. Pulley
• C. Lubricator
• D. Sheave

Answer: (A)

The main idea is guiding a cable so it doesn’t rub against aircraft surfaces. A fairlead is the device designed for this purpose: it provides a smooth, directed path for the cable as it passes by structure, preventing contact with sharp edges and controlling the bend radius to stop wear and fraying. A pulley or a sheave, while used to change direction and reduce friction over a wheel, centers on the wheel itself and the load it carries, not on keeping the cable off the structure. A lubricator’s job is to reduce friction by applying lubricant, not to physically guide the cable away from the surface. So the fairlead is the correct choice because it specifically prevents rubbing by guiding the cable.

The main idea is guiding a cable so it doesn’t rub against aircraft surfaces. A fairlead is the device designed for this purpose: it provides a smooth, directed path for the cable as it passes by structure, preventing contact with sharp edges and controlling the bend radius to stop wear and fraying. A pulley or a sheave, while used to change direction and reduce friction over a wheel, centers on the wheel itself and the load it carries, not on keeping the cable off the structure. A lubricator’s job is to reduce friction by applying lubricant, not to physically guide the cable away from the surface. So the fairlead is the correct choice because it specifically prevents rubbing by guiding the cable.