(5) Cup the casualty's head with the fingers of both of your hands and lift
his head slightly.
(6) Slide the head harness over the casualty's head by moving your
thumbs toward the back of his head and down behind his ears. The head harness
should not need to be adjusted.
(7) Make sure that the two bottom straps of the head harness are placed
below the casualty's ears and the head pad is centered in the middle of the back of his
e. Tighten the Straps. Tighten the straps so that a complete seal can be
Place your hands on the head harness pad.
Grasp the tips of one of the forehead straps with your other hand.
Tighten the forehead strap with short, firm jerks, then release.
(4) Using the same hand, grasp the strip of the other forehead strap and
tighten it with short, firm jerks.
(5) Release the forehead strap and remove your hand from the head
Using hands, tighten both temple straps simultaneously using short,
f. Check Fit. Make sure that the buckles are flat and that the straps form a
straight line with the tabs. Make sure that the casualty's eyes are near the center of
the mask lens.
g. Check for a Complete Seal. Check the mask to see that it is completely
sealed on the casualty's face.
(1) If the casualty is conscious and can follow instructions, have him clear
and check his mask.
(2) If the casualty is unconscious and cannot follow instructions, cover the
mask's inlet valves. The mask will collapse if it is completely fitted and sealed. If it
does not collapse, repeat the task.
h. Hood the Casualty. Pull the casualty's protective hood over his head,
neck, and shoulders.