TM 5-4220-225-14
Table 2-3. Daily Predive Procedures (Cont).
Step
Procedure
2. HELMET ASSEMBLY
NOTE
(Internal Checks)
Set helmet on its front viewport.Inspect helmet
interior for overall cleanliness.There should be no
evidence of foreign matter, oil or moisture, particu-
larly on helmet liner.
a.
Ducting Check.
(1)
Ensure ducting is properly installed.
(2)
Inspect ducting open ends for dirt, oil, and moisture.
b.
Communication System Check.
(1)
Inspect the helmet wiring for cut or nicked insulation, and loose,
dirty, and wet connections.
(2)
Ensure that earphones are clean, dry, and properly mounted in
the retainers.
(3)
Ensure that microphone is clean, dry, and securely mounted.
(4)
Visually inspect the communication whip and umbilical cable
assemblies for outer cover damage; chafing, abrasions, cuts,
and blisters.Check for coupling damage, corrosion, dirt, oil, and
missing or damaged preformed packing.
(5)
Connect the communication whip and communication station to
the communication/strength cable.
3. OPERATIONAL TESTS
a.
Vacuum Test.
Perform vacuum test of the nonreturn valve in accordance with
paragraph 2-8, a.
b.
P, Flow, and Leak Tests.
Perform P, flow and leak tests, in accordance with paragraph 2-8, b.
c.
Communication Check.
Perform a communication check between the helmet and station for
proper communication and volume
2-34
