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INFLATION ASSEMBLY INSPECTION | Up
Aircrew Survival Equipmentman 2 - Aviation theories and other practices | Next
Battery Replacement, LPU-23/P (Series) and LPU-24/P (Series) |
Figure 6-22.—Inflation lanyard pull test.
To perform the inflation lanyard pull test,
proceed as follows:
1. Ensure that the carbon dioxide cylinders
have been removed. Actuate the inflation assem-
bly. This test is testing the lanyard itself. It isn’t
designed to test the pull of the inflation assembly.
2. On life preservers with beaded inflation
handles, attach a pull scale to top end (end
opposite inflation lanyard) of beaded inflation
handle (fig. 6-22).
3. On LPP and LPA-1/1A life preservers,
attach the pull scale to the actuating lanyard at
the binder knot immediately above the knob.
4. Exert a 25-pound straight pull on the
inflation lanyard. Remove scale.
5. Examine the inflation lanyard for frays,
ruptures, thin spots, split casing, and security of
knots.
6. Replace any unsatisfactory inflation lan-
yards.
Installation of Cylinders: LPA-1/1A
(Series), LPA-2 (Series), LPU-21/P (Series),
LPU-30/P, and LPP-1 (Series)
Prior to installing any CO2 cylinder, it must
be weighed and the threads cleaned. By using the
cylinder thread chaser die, you turn the thread
chaser to the full extent of the threads on the CO2
cylinder to cut free any excessive cadmium plating
covering the threads (fig. 6-23).
Weigh the charged cylinder and compare the
stamped minimum weight with the scale weight.
Discard and replace the cylinder if the scale weight
is 2 grams less than stamped minimum weight.
Loosen the inflator setscrew if it is installed and
ensure that the inflator lever is in the cocked
position. To assure a firm cylinder seat, conduct
a cylinder thread count. The threaded portion of
the cylinder neck must contain a minimum of
seven full threads to assure a firm cylinder seat
Figure 6-23.—Cleaning threads.
within the valve body. Any cylinder found with
less than seven full threads must be discarded.
CAUTION
STEEL THREADS ON CARBON DIOX-
IDE CYLINDERS CAN CAUSE DAM-
AGE TO ALUMINUM THREADS ON
INFLATORS IF THE CYLINDER IS
NOT CAREFULLY THREADED. IF
BINDING OCCURS DURING THREAD—
ING, REPLACE THE CYLINDER.
After performing a functional test, insert a
new seat seal gasket from a kit. At intermediate
inspection intervals, inspect the condition of the
gasket and replace it if necessary. Install the CO2
cylinder into the inflator as far as hand twisting
will permit. Tighten the setscrews, if installed.
NOTE: When you replace the CO2
cylinder to the inflator, ensure that the
CO2 cylinder passes through the holding
patch loop. Do not install the setscrews in
LPA-2 and LPU-21/P life preservers. For
all other life preservers, a missing setscrew
does not warrant removal of the preserver
from service until a replacement setscrew
can be obtained. Safety-wire the inflator
as required.
Installation of Cylinders, LPU-23/P
(Series) and LPU-24/P (Series)
To install cylinders, proceed as follows:
Weigh a charged CO2 cylinder and com-
pare the stamped minimum weight with the scale
6-34
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