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Air or Nitrogen Servicing Trailer
Fluid Service Unit Model HSU-1

Aviation Maintenance Ratings - Aviation theories and other practices
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Figure 5-9.—Air or nitrogen servicing trailer. Always know the pressure existing in the system to be filled and the pressures in all the cylinders to be used up in the cascading process before beginning a charging operation. A malfunctioning pressure regulator should be disconnected from the line, closing its associated shutoff valve. The trailer can then be operated with the remaining regulator. The charging hose must never be stretched to reach a connection. Position the trailer so the hose is not under tension while servicing an aircraft. After servicing an aircraft system, stow the servicing hose in its container to ensure that it is not damaged by dragging along behind the trailer. Preoiler (PON-6) The preoiler (PON-6) is a portable, hand-carried, hand pump with a 3-gallon capacity. Figure 5-10 shows the major components of the PON-6. It will deliver oil at a pressure up to 100 psi. A sight glass (not shown in fig. 5-10) is located on the side of the reservoir and shows the level of the oil. An oil pressure gauge indicates oil line pressure. An oil meter records the amount of oil delivered. The meter is calibrated in ounces (outer scale) and quarts (inner scale). A push-button bleed valve relieves pressure on the meter and service hose and bleeds oil back to the reservoir. The service hose is 6 feet long. A complete drain bottle assembly is provided for overflow oil from the aircraft 5-14







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