TM 5-1940-321-13&P
( 4 ) Allow the valve to descend slightly into the buoyancy tube until the large
neoprene valve base washer is visible through the hole I the fabric.
( 5 ) Remove the large neoprene valve base washer from the valve base and fold it
to pull it through the hole in the buoyancy tube fabric.
( 6 ) Install a new neoprene valve base washer over the valve through the hole in
the fabric. Verify that the washer lays absolutely flat against the grooved flange
of the valve. Pull the valve through the hole in the fabric, and align the
markings made previously on the valve body and fabric. Press the fabric
against the valve base to avoid it being on the valve base threads.
( 7 ) While continuing to hold the valve through the fabric, reinstall the base nut.
Tighten it hand tight only. Then tighten the nut very lightly with the half-moon
spanner. Do not tighten the base nut firmly at this time.
( 8 ) Inflate the main buoyancy tubes to 240-260 mbar (3.5 4.1 psi).
( 9 ) Using the half-moon spanner, tighten the valve base nut moderately tight. Do
not over tighten. Avoid tightening to the extent that the valve base inside the
buoyancy tube will turn. Observe the alignment of the previously marked lines
as you tighten the base nut. Alignment must be maintained.
( 10 ) Reassemble the valve as described in chapter 5, paragraph 5-13.
( 11 ) Check for air leaks around the valve using the air leak test (chapter 6,
e. Remove and Replace Intercommunicating Valve. This corrective maintenance procedure is
performed by direct support personnel. Intercommunicating valve removal and replacement is only
performed when the valve threads are damaged or other conditions exist which cannot be repaired.
Removing and replacing the intercommunicating valve is a complex procedure. Before removing and
replacing the intercommunicating valve, verify that the problem cannot be corrected by servicing the valve
while it is installed in the buoyancy tube.
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