TM 5-4220-225-14
Table 2-1. Operator Preventive Maintenance Checks and Services (Cont).
B - Before
D - During
A - After
Q - Quarterly
Interval
Item
Item to be Inspected.
Equipment Will Be
No.
B
D
A
Q
Procedure
Reported Not Ready If
HELMET ASSEMBLY (Cont)
b. Inspect the viewports for proper assembly and for
Inspection reveals any of the
loose or missing screws:
defects sighted above or
any defect that renders the
helmet inoperable.
4.
Breech Rings and Locking Devices.
a. Inspect the helmet breech ring, lower breech ring
assembly, and locking devices for dirt, corrosion,
and loose or missing screws.
b. Inspect the breech rings and locking devices for
proper mating. Ensure the locking devices operate
freely and lock positively.
c. Inspect preformed packing for cuts, nicks and
deterioration. Replace if required. Apply a light
film of lubricant.
d. Inspect the installed neckdams and drysuit butyl
Inspection reveals any of the
rubber neckpieces for deterioration and cuts or
defects sighted above or
tears. Repair or replace if required.
any defect that renders the
helmet inoperable.
5.
Adapters.
a. Inspect the air adapter, mixed gas adapters, and
communication adapter for corrosion, dirt, and
loose or missing screws.
b. Inspect adapter cap seal preformed packing and
Inspection reveals any of the
gaskets for cuts, nicks, and deterioration. Replace
defects sighted above or
if required. Lightly lubricate.
any defect that renders the
helmet inoperable.
2-6
