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Fairleads may be made from a nonmetallic material, such as phenolic, or a metallic material, such as soft aluminum. The fairlead completely encircles the cable where it passes through holes in bulkheads or other metal parts. Fairleads are used to guide cables in a straight line through or between structural members of the aircraft. Fairleads should never deflect the alignment of a cable more than 3° from a straight line. 

Pressure seals are installed where cables (or rods) move through pressure bulkheads. The seal grips tightly enough 

to prevent excess air pressure loss but not enough to hinder movement of the cable. Pressure seals should be inspected at regular intervals to determine that the retaining rings are in place. If a retaining ring comes off, it may slide along the cable and cause jamming of a pulley. [Figure 2-74] 

## Travel Adjustment 

Control surfaces should move a certain distance in either direction from the neutral position. These movements must be synchronized with the movement of the flight deck controls. The flight control system must be adjusted (rigged) to obtain these requirements. The tools for measuring surface travel primarily include protractors, rigging fixtures, contour templates, and rulers. These tools are used when rigging flight control systems to assure that the desired travel has been obtained. Generally speaking, the rigging consists of the following: 

1. Positioning the flight control system in neutral and temporarily locking it there with rig pins or blocks; 

2. Adjusting system cable tension and maintaining rudder, elevator, and ailerons in the neutral position; and 

3. Adjusting the control stops to the aircraft manufacturer’s specifications. 

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