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Questions and Answers
What is the primary purpose of a 'cut-out' in a hydraulic system?
How can hydraulic pressure be restored in a system?
What is the color of the band on a hydraulic seal?
What is the function of a maintainer valve in a hydraulic system?
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In a hydraulic system, what component prevents creep in jack-operated services with multiple positions?
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What is the purpose of a 'cut-out' in limiting fluid loss during a pipe fracture?
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Where is the temperature overheat switch located in a hydraulic pump?
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What happens if a component has an internal hydraulic leak?
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What happens to hydraulic fluid when it is overheated?
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How is the hydraulic pump depressurising solenoid actuated?
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How do you prevent hydraulic fluid frothing?
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Accumulators as fitted to aircraft hydraulic systems...
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A Skydrol hydraulic fluid seal would be made of...
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Synthetic hydraulic fluid subjected to overheating is high in...
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A normal hydraulic system will...
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A constant volume hydraulic system uses what to relieve pressure in the system when no services are being used?
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What is the purpose of using two spanners to stop a pipe from twisting?
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How is air removed from hydraulic fluid?
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What is the function of a pressure control relay in a hydraulic pump?
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How is the output of a constant delivery pump varied?
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What does a check flow valve in a hydraulic system prevent?
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When does an hydraulic de-pressurising valve get energised?
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In a closed hydraulic system, what happens at the selector valves when no functions are required?
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What components constitute a hydraulic power pack?
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What is one possible issue if an accumulator loses air pressure?
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For what purpose would you fit a thermal relief valve in an hydraulic system?
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What is the correct fluid to use in aircraft hydraulic systems?
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What are the essential components of a hydraulic system of the constant delivery type?
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What is the primary function of an automatic cut-out valve in a hydraulic system?
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Why is a maintaining valve fitted to a hydraulic system?
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What is the purpose of a thermal relief valve in a hydraulic system?
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How are hydraulic systems typically flushed?
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What kind of seals are required for Phosphate Ester hydraulic fluid?
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What is the primary purpose of a RAT hydraulic pump?
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Where does the hydraulic hand-pump fluid supply usually come from?
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Why are hand pumps in hydraulic systems typically double-acting?
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What is the purpose of a shuttle valve in a hydraulic system?
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Why are restrictor valves used in a hydraulic system?
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What is the purpose of a non-return valve in a hydraulic system?
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Why are the end fittings on a non-return valve different?
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In a hydraulic accumulator, what happens when the hydraulic system pressure reaches 3000 PSI?
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What causes automatic cut-out valve hammering in a hydraulic system?
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Why are hand pumps in a hydraulic system usually single-cylinder double-acting?
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During a leak test of an hydraulic system, what should the system pressure be?
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What is required for constant delivery hydraulic pumps in a system?
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Where are pressure relay valves fitted in a hydraulic system?
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Study Notes
Hydraulic Pump and System Components
- The temperature overheat switch in a hydraulic pump is located in the case drain.
- A component with an internal hydraulic leak will result in an increase in fluid temperature.
Hydraulic Fluid Properties
- Overheating hydraulic fluid will increase its acidity.
- Synthetic hydraulic fluid subjected to overheating is high in acidity.
Hydraulic System Operation
- Hydraulic systems normally operate at 3000 PSI.
- A normal hydraulic system will show pressure and source of hydraulics.
- When no services are being used, a constant volume hydraulic system uses an Accumulator Charge Valve (ACOV) to relieve pressure in the system.
Hydraulic Pump Types
- A fixed volume axial pump contains a drive shaft, swash plate, and cylinder block.
- A variable angled pump starts at maximum stroke.
Hydraulic System Components
- A duplex seal consists of a rubber 'T' section ring sandwiched between two Teflon rings.
- A shuttle valve is used to change over from main to auxiliary system in the case of failure.
- A restrictor valve is used to control the rate of system operation.
- A mechanical sequence valve is used to ensure the operation of landing gear and doors.
Hydraulic System Safety
- An accumulator is charged with air pressure to absorb pressure surges.
- A thermal relief valve is fitted to relieve excess pressure due to excessive temperature.
- A hydraulic de-pressurising valve is energised when selected off.
Hydraulic System Maintenance
- When flushing hydraulic systems, the same hydraulic fluid should be used.
- When replenishing a hydraulic system, the same/correct hydraulic fluid should be used.
- When replacing a flexible pipe, use two spanners to stop the pipe from twisting.
Hydraulic System Troubleshooting
- If an accumulator loses air pressure, there will be rapid fluctuations of instruments.
- Automatic cut-out valve hammering is caused by low accumulator pressure.
- A maintaining valve is fitted to ensure a supply of fluid to essential services in the event of system failure.
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Description
Hydraulic Systems MC