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Questions and Answers
Which instrument is NOT mentioned as using a diaphragm or bellows?
Which instrument is NOT mentioned as using a diaphragm or bellows?
- Temperature gauge (correct)
- Altimeter
- Manifold pressure gauge
- Vertical speed indicator
What type of sensor changes its electrical resistance when a mechanical force is applied?
What type of sensor changes its electrical resistance when a mechanical force is applied?
- Crystalline piezoelectric sensor
- Piezoresistor (correct)
- Semiconductor chip sensor
- Aneroid sensor
What is defined as the pressure compared to a total vacuum?
What is defined as the pressure compared to a total vacuum?
- Differential pressure
- Gauge pressure
- Standard pressure
- Absolute pressure (correct)
What is the most common type of pressure measurement?
What is the most common type of pressure measurement?
What is the standard pressure value established for atmospheric pressure in aviation?
What is the standard pressure value established for atmospheric pressure in aviation?
What does the green arc on an oil pressure gauge indicate?
What does the green arc on an oil pressure gauge indicate?
What is the function of oil in reciprocating and turbine engines?
What is the function of oil in reciprocating and turbine engines?
In reciprocating engine aircraft, what does the manifold pressure gauge indicate?
In reciprocating engine aircraft, what does the manifold pressure gauge indicate?
What does the Engine Pressure Ratio (EPR) gauge compare?
What does the Engine Pressure Ratio (EPR) gauge compare?
Why is it undesirable to run a fuel line directly into the flight deck?
Why is it undesirable to run a fuel line directly into the flight deck?
What do hydraulic systems commonly operate in aircraft?
What do hydraulic systems commonly operate in aircraft?
What do the red dial lines on an oil pressure gauge indicate?
What do the red dial lines on an oil pressure gauge indicate?
How is the data transmitted to a digital EPR gauge?
How is the data transmitted to a digital EPR gauge?
What is the primary role of a pressure switch in a hydraulic system?
What is the primary role of a pressure switch in a hydraulic system?
Which pressure-sensing mechanism is typically used for measuring high pressures?
Which pressure-sensing mechanism is typically used for measuring high pressures?
How is vacuum pressure mainly determined in aircraft instruments?
How is vacuum pressure mainly determined in aircraft instruments?
What type of materials are commonly used to manufacture Bourdon tubes?
What type of materials are commonly used to manufacture Bourdon tubes?
What is an essential requirement for gyroscopic flight instruments to function properly?
What is an essential requirement for gyroscopic flight instruments to function properly?
What characteristic differentiates diaphragm from Bourdon tube in pressure measurement?
What characteristic differentiates diaphragm from Bourdon tube in pressure measurement?
What does the vacuum pressure gauge measure?
What does the vacuum pressure gauge measure?
Which of the following instruments would typically utilize a Bourdon tube for pressure measurement?
Which of the following instruments would typically utilize a Bourdon tube for pressure measurement?
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Study Notes
Engine Oil Pressure
- The most important instrument for assessing engine health.
- Measured in pounds per square inch (PSI).
- Green Arc indicates safe operating range.
- Red Dial Lines indicate minimum and maximum safe operating limits.
- Low or high oil pressure can lead to engine damage.
Manifold Pressure
- Gauge used in reciprocating engine aircraft.
- Indicates pressure of the air in the induction manifold.
- Higher pressure indicates more power being developed by the engine.
Engine Pressure Ratio (EPR)
- Gauge used in turbine engines.
- Compares exhaust pressure with intake air pressure.
- Provides an indication of engine thrust.
Fuel Pressure
- Typically measured remotely using a transmitter device.
- Prevents fuel line from running into the flight deck, reducing fire risk.
Hydraulic Pressure
- Used in systems for operating landing gear, flight controls, brakes, etc.
- Sufficient pressure is crucial for hydraulic system operation.
Vacuum Pressure
- Measured using a gyro pressure gauge, vacuum gauge, or suction gauge.
- Powers air-driven gyroscopic flight instruments.
- Ensures gyros spin at the correct speed for accurate instrument readings.
Pressure Switches
- Devices that open or close an electric circuit at a specific pressure.
- Can be configured to open or close the circuit depending on the pressure.
Pressure Measurement Mechanisms
- Bourdon Tube: Used for relatively high pressures, often made from brass, bronze, or copper alloys.
- Examples: engine oil pressure gauge, hydraulic pressure gauge, oxygen tank pressure gauge, deice boot pressure gauge.
- Diaphragm or Bellows: Used for relatively low pressures, often located inside direct reading gauges.
- Examples: altimeter, vertical speed indicator, cabin differential pressure gauge, manifold pressure gauge.
- Solid-State Sensing Devices: Used in modern aircraft to determine critical pressures.
- Examples: crystalline piezoelectric sensor, piezoresistor, semiconductor chip sensors.
Types of Pressure
- Absolute Pressure: Force compared to a total vacuum.
- Gauge Pressure: Difference between measured pressure and atmospheric pressure.
- Differential Pressure: Comparison of two pressures, measured using a differential pressure gauge.
- Standard Pressure: Established value for atmospheric pressure:
- 29.92 inches of mercury (Hg)
- 1,013.2 hectopascal (hPa)
- 14.7 psi
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