Figure 6. Bending large tabs with glass pliers.
this elongated position for approximately 5 seconds. If
Note. When the press reaches the preset
the nosecup does not separate from the facepiece (a
pressure, it will automatically release. This adjustment
popping sound is usually heard if the nosecup does
prevents applying too much pressure for the crimp.
separate from the facepiece), the crimp is satisfactory.
Visual check of the gage provides assurance that the
If the crimp is not satisfactory, rework the mask.
correct amount of pressure is being applied.
(2) Install mask components necessary for
(6) Release and raise the upper die. Unlock
the lower die, and remove the mask from the crimping
(4) Install mask components that were
(1) Check to make sure that the nosecup
(5) Install the head harness.
assembly and the voicemitter-outlet valve assembly
have been crimped to the facepiece satisfactorily.
Reach into the cavity of the mask between the
18. Testing Masks for Leakage
facepiece and the top of the nosecup. Elongate the
Test the mask for leakage using the M14 protective
nosecup (approximately 1/4 inch) -with the middle finger
mask leakage tester.
by pressing the nosecup as close as possible to the
voicemitter-Outlet valve frame. Hold the nosecup in