Figure 11-17. - Correction of mat misalignment.

against the mat edge before striking, as shown in figure 11-17.

10. Every 100 feet, install a row of typical keylocks in the matting field (fig. 11-6). Place a 9-foot typical keylock at the outer edge of the runway with the female end of the keylock aligned with the first mat of the preceding row (fig. 11-1 8). Engage the female edge of the typical keylock with the male edge of the mat in the preceding row (similar to fig 11-12 and step 4).

11. Place a 12-foot typical keylock next to the installed 9-foot typical keylock. Move the 12-foot section against the 9-foot section after first engaging the female edge of the keylock with the male edge of the first twoo mats in the preceding row. Raise the socket head screw in the male end of the 9-foot keylock until the threaded hole in the female end of the 12-foot keylock is aligned. Then secure the socket head screw in the 9-foot keylock, using the socket head screw wrench.

See detail "A" of figure 11-18 that shows the typical keylocks secured together. Repeat laying of six more 12-foot sections and one 3-foot section of the typical keylocks to complete the 96-foot width of the runway.

NOTE: After the laying of a row of typical keylocks every 100 feet, continue laying AM-2 matting, according to steps 4 through 9, to the ends of the runway.

Runway APPROACH APRONS are required at each end of the main runway. These aprons are ramps made of mats placed to prevent the tail hook of a low