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AIRFRAME
J HYDRAULIC AND PNEUMATIC POWER SYSTEMS
| Question | Answer |
|---|---|
| What materials form the bases of the three types of hydraulic fluids? | Vegetable, mineral, and phosphate-esters. |
| What colors denote mineral-based and phosphate-ester-based hydraulic fluids? | Mineral based fluids are red and phosphate-ester based fluids are light purple. |
| What are the results of exposing lacquers, oil-based paint, plastic resins, and vinyl compounds to phosphate-ester-based hydraulic fluid? | The materials will be damaged and/or softened, or the paint will peel. |
| Name several sources used to develop hydraulic pressure. | Hand pumps, engine-driven pumps, and electrically driven pumps. |
| What would cause the bypass valve in a hydraulic filter to open and allow unfiltered fluid to circulate in the system? | A clogged filter element. |
| Describe several methods of pressurizing a hydraulic reservoir. | Engine bleed air, system pressure acting on a small piston in the reservoir, using Variable-displacement hydraulic pumps. |
| What feature prevents engine damage if an engine-driven hydraulic pump seizes or is overloaded? | A shear section in the pump driveshaft will break, disconnecting the pump from the engine. |
| Describe the purpose of a pressure relief valve. | Pressure relief valves limit the maximum pressure produced by the pump, thereby preventing failures of the system components. |
| Engine-driven pumps deliver the output fluid flow in what two forms? | As a constant volume or a variable volume. |
| Describe the operation of a gear-type pump. | Two meshed gears, driven by a power source, rotate in a housing. Inlet fluid is carried around the outside of the gears and delivered to the outlet side as the gears rotate. |
| Describe the purpose of a pressure regulator. | Pressure regulators manage the output of the pump to maintain system pressure. They allow the pump to be unloaded so it turns without significant resistance. |
| What is the device that is used in some systems to supplement the pump output during periods of high demand? | An accumulator. |
| What are the three different types of accumulators? | Piston, diaphragm, and bladder. |
| What safety precautions must be taken prior to disassembling an accumulator? | Release all of the air or preload. |
| When a hydraulic unit is replaced, what precautions should be taken to avoid contamination of the system? | All lines should be capped or plugged immediately after they are disconnected |
| What types of components or systems are pneumatically operated in some aircraft? | Landing gear, brakes, flaps, and other mechanical actuators. |
| Name several sources of pneumatic power. | Storage bottles, engine bleed air, engine-driven compressors or vane-type pumps. |
| What happens to excess pressure in a pneumatic system? | A relief valve vents it overboard |
| What is the function of a restrictor in a pneumatic system? | To control the rate of flow of the airflow. |
| What are the reasons for periodically purging a pneumatic system? | To remove moisture and contaminants. |
Created by:
S_A_J