Figure 60. Freshwater filling of cavity during patching.
Figure 61. Freshly patched failure site approximately 4 hours after flooding with water.
way is not yet in use, a bamboo pole with a
manager, the air traffic controller, and the
flag can be pushed into the ice-water slurry
flight crew coordinator should be notified
to mark the location.
that a fresh patch is on the runway and that
7. Note the approximate location of the patched
this area should be avoided for at least 48
area using the runway markers as a guide
hours.
for the long axis position, and the knowl-
8. Allow the area to freeze for a minimum of
edge of the runway width for the other axis.
48 hours prior to traffic. The flag should
If air operations are in effect, the airfield
then be removed. If possible, the patched
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