the same reamer and at the same time if survey lines
have been established, pallet staging has been
accomplished, and sufficient personnel are available.
A typical keylock section is laid every 100 feet,
starting with the 100-foot mark on either side of the
The general sequence of laying mating for the
runway with the guide rail installed is to start at one
end (at the approach apron) and work toward the
opposite end. The guide rail divides the runway into
two sections, 18 feet and 78 feet (or 18 feet and 30 feet
for a 48-foot runway). Individual mats are laid in a
brickwork type of pattern from the guide rail to the
outer edge in each section when facing the working
area. The starter keylock is not used when laying a
runway with a guide rail. Instead, typical keylocks are
laid at 100-foot intends on the runway, and other
sections of the SATS field are laid as explained in the
Be sure to inspect visually upturned sides and end
connectors of AM-2 matting for foreign matter before
placing them in position. The presence of dirt, chips,
stones, and so on, can prevent proper interlocking of
the mats. Brooms or brushes can be used to clean
foreign matter from the connectors.
Mat-Laying Procedure without
a Guide Rail
The sequence for installing AM-2 mats and related
components where a guide rail is not required is shown
in figure 11-6. The sequence can be modified, so work
proceeds on only one row of mats at any given time;
however, SPEED OF INSTALLATION IS
IMPORTANT. The sequence, as shown in figure 11-6,
allows the use of at least two crews with six 2-man
teams on each crew carrying and placing mats and
When placing AM-2 mats, you should have three
types of keylocks: starter, typical, and female. You
should use a step-by-step procedure to place the AM-2
STARTER KEYLOCK. The starter keylock is
a narrow mat that is used to decrease runway
installation time by approximately one half (fig. 11-7).
Previous mat installation methods required
assembling the runway at one extremity and working
to the other end. The starter keylock is installed in the
middle of the runway only and enables two mat-laying
teams to start together and work simultaneously
toward each end of a runway, section. Starter keylocks
Figure 11-7.Starter keylock.
are furnished in 3-foot, 9-foot, and 12-foot lengths to
allow for the staggering of joints in matting patterns.
The starter keylock is coated with a nonskid material.
It is not used in installations having a guide rail.
TYPICAL KEYLOCK. A typical keylock (fig.
11-8) is inserted every 100 feet in the pattern to permit
the easy removal of sections of the matting for a
multiple-mat replacement. For this reason, only a
maximum of 50 feet of any one section needs to be
removed to replace mats that could not economically
be replaced as individual units by replacement mats.
Typical keylocks are furnished in 3-foot, 9-foot, and
12-foot lengths to allow the staggering of joints of
matting patterns. The typical keylock is coated with a
FEMALE KEYLOCK. A female keylock (fig.
11-9) is used to join two adjacent male mats. The
female keylock is coated with a nonskid material.
Figure 11-8.Typica1 keylock.