TM 3-4240-212-14&P
i. If facepiece, breathing tubes, or valves leak,
the straps. Start at the bottom and work upward.
f. Cover coupling end of inhalation (right-hand)
report the malfunction to organizational maintenance
personnel.
breathing tube with palm of hand and inhale. When this is
done, the facepiece will collapse if it is fitted properly and
3-4. Testing Timer
there are no leaks in facepiece, exhalation valve, or
inhalation breathing tube.
a. Turn knob past 10 on timer dial and listen for a
g. Cover coupling end of exhalation (left-hand)
regular ticking sound.
breathing tube with palm of hand and exhale forcibly.
b. Make sure that timer's alarm rings 5 minutes
Exhaled breath should escape from around facepiece if
before the completion of the set time, and again at the
there are no leaks in the inhalation valve or exhalation
completion of the set time. On earlier models the alarm
breathing tube.
will ring only at the completion of the set time.
h. Remove facepiece by grasping head harness
c. Report defects to organizational maintenance
pad and sliding head harness forward.
personnel.
3-2
