Each waist lobe of the flotation assembly is
equipped with an attachment patch used for
securing the casing assembly by means of rivets.
In addition, the right waist lobe is equipped with
one snap hook and the left waist lobe is equipped
with one D-ring. The snap hook and the D-ring
are used to secure the waist lobes together after
inflation. Survival item pouches are fastened to
the life preserver D-rings with directional snap
Each collar lobe of the flotation assembly is
equipped with a snap hook for attachment to the
survival vest D-rings (parachute risers are routed
outside of the collar lobes). In addition, an
inspection record patch is also provided on a collar
The casing assembly is constructed of fire-
retardant Aramid cloth and protects the flotation
assembly. The casing assembly also provides for
size adjustment and attachment to the wearer. The
casing assembly consists of the adjustable casing,
an adjustable webbing belt, belt keepers and D-
rings, and the front connector assembly.
The webbing belt, attached to the inside waist
portion of the casing assembly, provides for waist
size adjustment from 30 to 44 inches. The webbing
belt keeper loops retain the webbing belt and
provide for attachment of the survival vest about
the wearers waist. In addition, there are six D-
rings secured to the webbing belt keeper loops,
used for attaching the survival item pouches, a
raft retaining line, and other accessories.
Hook and pile tapes, attached to the outside
waist portion of the casing, are used for slack
adjustment. In addition, hook and pile tapes,
attached about the circumference of the collar
casing and the lower edge of the back portion of
the casing, are used to enclose the casing assembly
about the flotation lobes.
The casing assembly is secured around the
wearers waist by the front connector assembly,
which. consists of two snap hooks and two D-rings
backed by webbing pads for comfort.
Each inflation assembly is made up of a
carbon dioxide cylinder and an inflation valve.
The inflation assemblies are connected to valve
stems attached to each waist lobe (each valve stem
is equipped with a check valve to prevent leakage).
As stated earlier, the LPU-21/P series life
preserver assembly is authorized for use by all
aircrew personnel wearing compatible flight
clothing. LPU-21 /P series life preservers that are
modified to incorporate the FLU-8/P series
automatic inflation device will be used in ejection
seat type of aircraft only. LPU-21/P series life
preservers modified with the FLU-8A/P inflator
will be redesignated the LPU-23A/P life pre-
The LPU-21/P series is manually inflated by
pulling both inflation assembly beaded handles
in a natural, slightly down and straight out
position from the body. This action removes the
retaining pins securing the casing assembly about
the waist lobes and actuates the inflation
assemblies. The hook and pile tapes securing the
casing assembly about the collar lobes will
separate as the preserver inflates.
NOTE: The casing must be manually
opened and the flotation assembly
unfolded prior to inflating a preserver
through the oral inflation valve.
In an emergency situation, the oral inflation
valves may be used to top off an inflated
preserver, maintain inflation of a leaky preserver,
or inflate a chamber if an inflation assembly
malfunctions. The oral inflation valves are also
used to inflate a preserver with air during an
inspection test and to evacuate a preserver in
preparation for packing.
LPU-23/P SERIES LIFE
The LPU-23/P series life preserver assemblies
contain an automatic inflator that is intended for
use by an aircrew member in an ejection seat
The LPU-23/P assembly is identical to the
LPU-21/P assembly except for the FLU-8A/P
automatic inflation device (fig. 6-13).
The LPU-23/P series life preserver assembly
is inflated either automatically (by immersion in
fresh or salt water) or manually (by pulling both
inflation assembly beaded handles).
NOTE: The primary means of inflation is
to manually pull the beaded handles.
Automatic inflation occurs when immersion
in water triggers the electronic circuit, firing the
explosive primer. The high-pressure primer forces
the piecing pin forward, releasing the inner end
of the packing cord loop and puncturing the
35-gram CO2 cylinder, which releases the
pressurized gas. Automatic inflation is a onetime
function of the FLU-8A/P inflator. A new
inflator must be installed to replace the previously
spent device. Manual inflation occurs when both