Figure 11-9. - Female keylock.

Steps for Laying AM-2 Mats and Keylocks The procedure for laying AM-2 mats and keylocks is shown in figures 11-10 through 11-18 and consists of the following steps:

1. Lay starter keylocks on the transverse center line of the runway. (See fig. 11-10.) A 9-foot starter keylock is laid at the outer edge of the runway. Remove the socket head screws from the keylock to allow for extending the locking bars into the next keylock section.

2. Place a 12-foot starter keylock next to, and aligned with, the 9-foot section. Move the 12-foot section against the 9-foot section, and adjust the locking bar so the socket head screws secure the locking bar in each section this procedure secures the 9-foot starter keylock and the 12-foot starter keylock, as shown in detail "A" of figure 11-10.

3. Repeat laying six more 12-foot sections and one 3-foot section of starter keylocks to complete the 96-foot width of the runway.

NOTE: Initially, lay several transverse rows of AM-2 matting in one direction only from the starter keylock row. If matting is started on both sides of the starter keylock, a seesaw force could result, disturbing the alignment of the entire field.

4. With the nonskid side of the mat turned up and the upturned prongs on the right, align the first mat (half mat) on the left side with the starter keylock (fig. 11-11). Align the downturned prongs with the runway edge. Hook the female edge of the mat into the groove on the starter keylock (fig. 11-12) while holding the mat in an angular position. Rotate the mat downward to form the joint. (See fig. 11- 12.)

5. Lay the second and all successive mats the same way as the first mat (fig. 11-11) in relation to the starter keylock. The downturned prongs of the second mat should mate with the upturned prongs of the first mat, as shown in figure 11-13. When the mats are properly engaged, a rectangular slot is formed by the engagement of the end connectors.

6. Lock the first and second mats together, as shown in figure 11-14, by inserting the locking bar (fig. 11-15).

NOTE: The first two mats and all mats in the first row should be aligned accurately before inserting the locking bar. Misalignment of mats will prevent proper installation of the second row. Locking bars may stick

Figure 11-10. - Placing starter keylocks on a transverse center line.