Why should the center line of the lightweight fairlead beam sheaves project at least 1 foot above the runway?

The requirement for the center line of the lightweight fairlead beam sheaves to project at least 1 foot above the runway is primarily to ensure that the tape path remains unobstructed. When the sheaves are positioned too low, the runway surface can indeed interfere with the tape’s movement, leading to potential operational disruptions and inefficiencies. This clearance provides a critical separation between the runway and the tape, allowing for smooth operation during various phases of use.

Maintaining adequate height is essential for ensuring that the system functions correctly without the tape snagging or facing resistance that could arise from being too close to the runway surface. Proper alignment and elevation reduce the risk of mechanical failures and enhance the reliability of the system during demanding operational scenarios.