PNEUMATIC SERVICING

Aviation Maintenance Ratings - Aviation theories and other practices
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Reservoir capacity Refill level Specification and color of fluid Correct position of all actuating cylinders during filling Other information considered necessary during the filling of the reservoir NOTE: After opening a can of hydraulic fluid, the entire contents should be poured into the fill stand or servicing unit immediately. This will prevent the fluid from absorbing dust and grit from the air. Aviation Hydraulics Manual, NAVAIR 01-1A-l7, requires that any remaining fluid left in the hydraulic fluid container, after servicing a fill stand/servicing unit, be discarded, and that the empty fluid container be destroyed immediately and not used to store or handle other fluids. Q13. Define viscosity. Q14. What scale is used by both the Navy and the Air Force to determine oil viscosity? Q15. What is the military specification number for the hydraulic fluid presently used in the hydraulic systems of all naval aircraft? Q16. What should be done with the fluid remaining in the can after filling a servicing unit? PNEUMATIC SERVICING Landing gear struts, hydraulic accumulators, and various air storage bottles found on most naval aircraft must be serviced with compressed air or nitrogen. These components are serviced by Aviation Structural Mechanics (AMs). You should refer to the applicable training manuals and technical manuals for in-depth discussions of the servicing of rate-peculiar components. Servicing Air Storage Bottles Nitrogen and air storage bottles are used on some aircraft for various emergency operations. These bottles are necessary for the safe operation of the aircraft and the safety of the crew. Air storage bottles are used for such functions as emergency brakes, emergency landing gear extension, and emergency canopy operation. Some aircraft have a pneumatic system that will maintain the required pressure in these bottles while in flight. However, most of these pneumatic systems require servicing on the ground with an external source of high-pressure air or nitrogen before each flight. 5-11 Air storage bottles and accumulators are serviced similarly. Most air bottles have an air filler valve and a pressure gauge. They usually require higher servicing pressures than accumulators. A high-pressure compressor and other special equipment, such as the nitrogen booster, must be used to obtain these higher pressures. Inflation of Tires For aircraft tires to perform satisfactorily, the correct air pressure must be maintained. Aircraft tires must be inflated to the pressure specified for the type of operation (ashore or afloat) that the aircraft is performing and for the gross weight of the aircraft. Air pressure must be checked daily with an accurate gauge. Tire inflation data is usually attached to the aircraft, as shown in figure 5-6. When the aircraft does not have this plate, you can find the information in the general information and servicing section of the applicable MIM. Overinflation or underinflation of aircraft tires causes specific problems. Overinflation reduces the Figure 5-6.—Tire inflation chart.

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