TM 9-4931-374-13&P
b. Drill two 0.531-in. (1.349-cm) diameter holes (3), 1.50 in. (3.81 cm)
deep, into ceiling from inside of shelter as illustrated.
c. Drill twenty-two 0.125-in. (0.318-cm) diameter holes (4) through
inside skin of ceiling, one on each side of the nine 0.375-in. (0.953-
cm) diameter holes (2) and one on each side of the two 0.531-in.
(1.349-cm) diameter holes (3).
2
HONEYCOMB CELL WALL (5). Cut through if it falls between 0.375-in.
(0.953-cm) or 0.531-in. (1.349-cm) diameter hole and the 0.125-in.
(0.318-cm) diameter holes.
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