TM 5-4220-225-14
Table 2-3. Daily Predive Procedures (Cont).
Step
Procedure
(2)
Remove diaphragm retainer and inspect diaphragm for damage
and deterioration.
(3)
Apply a light film of lubricant to bead of diaphragm and install
diaphragm and ambient diaphragm retainer. Ensure diaphragm
seats properly.
(4)
Install ambient exhaust valve cover.
g.
Breech Ring Check.
(1)
Set helmet on top viewport retainer and visually inspect breech
ring for dents, nicks, and corrosion. Ensure preformed packing
groove is clean.
(2)
Visually inspect breech ring for damaged, loose or missing
mounting screws.If loose, tighten as necessary.
(3)
Inspect O-ring for nicks, cuts, deterioration and proper size.
Apply a thin film of lubricant to preformed packing and install it in
helmet breech ring groove.
h.
Air Supply Whip Check.
(1)
Remove protective cap from air whip; inspect the fitting for
corrosion or damage.
(2)
Ensure gasket is in good clean condition. Replace if required.
Apply a light film of lubricant.
i.
Communication Whip Assembly Check.
Remove protective cap from communications whip and inspect for
cuts, sharp bends, corroded contacts, and damaged threads.
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