Figure 11-11. - Placing first and second mats

Figure 11-12. - Engaging first half mat (half length) to starter keylock.

because of the natural waviness in the manufacture of the mat end connectors and the locking bars. A few light taps of a hammer should drive the bar into the proper position.

7. Place the third mat at the start of the second row, as shown in figure 11-16. Ensure that the third mat is aligned on the left side with the mat in the preceding row. Refer to figure 11-12 and step 4 for the engagement procedure, which is the same for the engagement of the third mat with the first and second mats.

NOTE: The first row of mats and each alternate row thereafter is laid using half mats at the outer edges of the runway and full mats in between (fig. 11-6). The second row of mats and each alternate row thereafter is laid using full mats only. This method provides a staggered joint for greater matting strength.

8. Complete the first row, installing six more full-length mats and finally a half mat, using the same procedure as described for installation of the second mat. (See step 5.)

NOTE: The first row of mats on the opposite side of the starter keylock row are all full mats (fig. 11-6).

CAUTION

Align the first row accurately with stakes or guidelines delineating the extent of matting. As work progresses, periodically check the alignment of mats already installed. Any misalignment causes a displacement of the runway from the planned position at the far end of the field.

9. Install the second and succeeding rows according to the procedure for the third mat (first mat in the second row) with one notable exception. The second mat in each row must first be hooked to the