10. Using the 5/32-inch socket head screw wrench,
loosen the two setscrews retaining the locking bar.
Insert a screwdriver or similar instrument in the holes
next to the setscrews, and force the locking bar toward
mat D as far as possible. This will lock the replacement
mat and clear the setscrew holes. Bottom the setscrews
so that the locking bar remains in plain. (See view D of
fig. 1 1-34.)
SECTION OF RUNWAY
A section of runway replacement maybe required
when groups of mats are damaged beyond repair or
when excessive mat deflection and roughness, due to
cavities under the mats, must be corrected.
The procedure for replacing a section of runway
is essentially the same with or without a guide rail
installation. However, with a guide rail installed,
removal of typical keylock sections will proceed from
the outer edge of the runway regardless of which side
of the guide rail the repair is to take place. Without a
guide rail and when starter keylocks are used, typical
keylocks must be removed from the right-hand edge
of the runway (or taxi way) when facing the end of the
runway from the transverse center line. This edge of
the runway exposes the female end of the keylock into
which the special removal tool must be inserted.
The replacement of a section of the runway is
accomplished in the following manner:
1. Remove the first typical keylock action by
loosening the socket head screw at the first inboard
connection. This screw only needs to be loosened until
it is free of the male end of the adjoining keylock (about
7/1 6 inch). The screw should not be removed further
since it is designed to be self-retaining and reassembly
can be affected from this position.
2. Insert the prong of the removal tool under the
turned down lip of the female connector and slide the
keylock from its position, as shown in figure 11-35.
NOTE: The initial 3-foot or 6-foot keylock
section will have to be pried out since the exposed end
is merely an unfinished cross-sectional cut and will
not accept the removal tool.
3. Loosen the next and subsequent connectors, as
described previously, and remove the remaining
keylock sections. If mat distortion is minimal, you may
be able to remove more than one keylock section at a
4. Use blocking and pry bars to lift the first row of
mats high enough to allow the locking bars to clear.
Each mat has one pry bar. All pry bars should be
operated at the same time for the full width of the
runway (or taxi way) to prevent warping of the mats. The
mats will readily hinge at the first longitudinal mat joint.
NOTE: If a guide rail has been installed, the
adjacent mat maybe cut parallel to the guide rail. This
cut must be made so it severs the locking bar to allow
the locking bar and the end connector to be removed
from the guide rail.
5. With the row of mats raised, insert a bent rod or
wire in the locking bar hole and remove each locking
bar including the bars securing the cut piece of the guide
rail. The first row of matting may then be disassembled
and removed. (See fig. 11-36.)
Figure 11-35.Typical keylock removal tool.