bailout or walkaround oxygen sources. The mask
also provides facial protection from projectiles
and fire, as well as working at depths of 16 feet
underwater. A properly fitted oxygen mask is also
essential to helmet retention in high-speed
ejections. The facepiece permits utilization of the
valsalva maneuver to clear clogged sinuses by
holding your nose with your mouth shut and
trying to exhale. Then open your mouth wider.
This operation will clear most sinus cloggings.
The MBU-12/P pressure-demand 02 mask is
the basic mask used to configure any of the
following oxygen mask assemblies:
MBU 17(V) 1/P
Information on each assembly can be found
in NAVAIR 13-1-6.7. Figure 4-17 shows a
MBU 12/P configured into a MBU 14(V) 1/P.
Figure 4-17.MBU-14(V)1/P oxygen mask assembly.