relubricated with special equipment. This is usually
done only by depot-level maintenance activities.
Pulley brackets made of sheet or cast aluminum
are required with each pulley installed in the aircraft.
See figure 2-38. Besides holding the pulley in the
correct position and at the correct angle, the brackets
prevent the cable from slipping out of the groove on
the pulley wheel.
SECTORS AND QUADRANTS
These units are generally constructed in the form
of an arc or in a complete circular form. They are
grooved around the outer circumference to receive the
cable, as shown in figure 2-38. The names sector and
quadrant are used interchangeably. Sectors and
quadrants are similar to bell cranks and walking
Figure 2-38.Control system components.