11.1.2-9 Lateral Spread of Controls and Displays

All necessary controls and displays needed for critical or frequently performed activities should be within the maximum extended reach and viewing range of a seated user from a single reference point as shown in Table 11.1 and illustrated in Figure 11.5.

Additional Information: For sustained or precise control action, the user should be able to reach the controls without having to bend/stretch significantly. The acceptable lateral spread of controls and displays on sit-down consoles depends primarily on the reach of the users, panel orientation, grouping of controls and displays, and the freedom of the user to adjust seat position (center reference point) given task sequence requirements. Figure 11.5 illustrates reach and viewing range related to lateral and forward distance from a center reference point.

Table_11.1
Table 11.2 Relative legibility of color combinations.

Figure_11.5
Figure 11.5 Reach and visual range related to lateral and forward distance from center point.