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Figure 6-15.LPU-3O/P life preserver assembly, parts nomenclature
Table 6-7.Life Preserver Test Pressures

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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FUNCTIONAL TESTING Before you attempt to perform a functional test, you should ensure that the work area surrounding the preserver is free of all foreign objects. This is done to prevent any accidental damage to the life preserver. When you perform a functional check, you want to ensure that the system operates as if the aircrew member were using it in an emergency. Therefore, your first step is to pull the actuation toggle. The preserver should fully inflate to its design shape without any evidence of restriction in less than 30 seconds. If the preserver does not meet this requirement, you will have to determine the reason and correct it. To do this, first look at your stem and valve. Sometimes dirt or foreign matter can cause a slow inflation. If you make any corrections, the preserver is functionally tested again. Deflate the preserver by using a vacuum pump and a 3/8- or 1/2-inch inside diameter rubber hose. Attach one end of the rubber hose to the vacuum pump, and the other end will go to the oral inflation valve or to the carbon dioxide cylinder valve, depending on which type you are using. After the preserver has been completely deflated, release the oral inflation valve or put the CO2 cylinder back into the valve. The functional check is only performed when the preserver is placed into service and every fourth calendar check after that. LEAKAGE TEST All life preservers are subjected to a leakage test each calendar/phase inspection. This test is performed each time the preserver comes into be checked, even when a functional test is required. A special test fixture is needed to perform this test. Test Fixture A suggested test fixture, consisting of a three- way valve, pressure gauge, and adapters for compartments being tested, is shown in figure 6-16. The fixture must be fabricated to meet the requirements of the schematic shown in figure 6-17. 239.471 Figure 6-16.—Leakage test fixture life preserver. Figure 6-17.—Test rig schematic. Test Procedure To test life preservers, proceed as follows: 1. Ensure all carbon dioxide has been removed from any preserver that has been functionally tested. 2. To test the LPU-28/P life preserver, insert a 3/4-inch O.D. rubber hose into the oral inflation 6-30







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