Testing Timer

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