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Questions and Answers
What is the primary function of the bimetal construction in the airspeed indicator?
What is the primary function of the bimetal construction in the airspeed indicator?
What do the red radial lines on the airspeed indicator represent?
What do the red radial lines on the airspeed indicator represent?
What is the significance of the green or white range on the airspeed indicator?
What is the significance of the green or white range on the airspeed indicator?
What is the purpose of the amber caution speed range on the airspeed indicator?
What is the purpose of the amber caution speed range on the airspeed indicator?
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What is the term for the maximum speed limited by structural considerations of the airframe?
What is the term for the maximum speed limited by structural considerations of the airframe?
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What is the significance of the airspeed indicator markings for pilots?
What is the significance of the airspeed indicator markings for pilots?
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What is the primary function of a pitot probe in an aircraft?
What is the primary function of a pitot probe in an aircraft?
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What is the purpose of a calibrated drain hole in a pitot probe?
What is the purpose of a calibrated drain hole in a pitot probe?
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What is the name of the detecting element used to measure static pressure in an aircraft?
What is the name of the detecting element used to measure static pressure in an aircraft?
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What is the purpose of a powerful electrical heater element in a pitot probe?
What is the purpose of a powerful electrical heater element in a pitot probe?
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What is a common issue with the simple tube design of a pitot probe?
What is a common issue with the simple tube design of a pitot probe?
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In some light aircraft, what is the static vent often simply?
In some light aircraft, what is the static vent often simply?
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What is the primary variable measured by the conventional airspeed indicator in a Machmeter?
What is the primary variable measured by the conventional airspeed indicator in a Machmeter?
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What is the purpose of the aneroid capsule in the Machmeter mechanism?
What is the purpose of the aneroid capsule in the Machmeter mechanism?
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How is the altimeter mechanism calibrated in the Machmeter?
How is the altimeter mechanism calibrated in the Machmeter?
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What is the effect of temperature on the speed of sound in the Machmeter?
What is the effect of temperature on the speed of sound in the Machmeter?
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What drives the indicator pointer in a Machmeter?
What drives the indicator pointer in a Machmeter?
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What is the advantage of combining a Machmeter and airspeed indicator into one instrument?
What is the advantage of combining a Machmeter and airspeed indicator into one instrument?
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What is the function of the calibrated leak in the metering unit of a Vertical Speed Indicator?
What is the function of the calibrated leak in the metering unit of a Vertical Speed Indicator?
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During straight and level flight, what is the position of the pointer on the dial of a Vertical Speed Indicator?
During straight and level flight, what is the position of the pointer on the dial of a Vertical Speed Indicator?
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What is the effect of a decrease in pressure inside the capsule of a Vertical Speed Indicator?
What is the effect of a decrease in pressure inside the capsule of a Vertical Speed Indicator?
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What is the purpose of the capillary tube in a Vertical Speed Indicator?
What is the purpose of the capillary tube in a Vertical Speed Indicator?
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What is the component that connects the measuring element to the indicating element in a Vertical Speed Indicator?
What is the component that connects the measuring element to the indicating element in a Vertical Speed Indicator?
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In what type of flight is the static pressure constant and there is no movement of air through the metering unit orifice?
In what type of flight is the static pressure constant and there is no movement of air through the metering unit orifice?
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Why is it necessary to fit probe covers on the pitot static probe while the aircraft is on the ground?
Why is it necessary to fit probe covers on the pitot static probe while the aircraft is on the ground?
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What can cause a blockage in the pitot port?
What can cause a blockage in the pitot port?
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What is critical for the pitot static probe?
What is critical for the pitot static probe?
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What happened to an Airbus A330 in Brisbane, Australia in 2013?
What happened to an Airbus A330 in Brisbane, Australia in 2013?
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What should be consulted for specific information about pitot static system maintenance?
What should be consulted for specific information about pitot static system maintenance?
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What can happen if the pitot static probe is bent or twisted?
What can happen if the pitot static probe is bent or twisted?
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Study Notes
Temperature Compensation in Airspeed Indicators
- Temperature increase affects the ranging bar, which deflects in the opposite direction to counteract capsule expansion.
- This keeps the indicating element at a constant reading.
Airspeed Indicator Markings
- Airspeed indicators have various limitation markings for pilots, specific to the aircraft model.
- A red radial line indicates the never exceed speed (Vne), limited by structural considerations of the airframe.
- The stall speed is indicated by the low-speed end of the green or white ranges, dependent on flap and landing gear configuration.
- The amber caution speed range requires smooth, turbulent-free conditions for safe operation.
Pitot Static System
- A pitot probe consists of an open-ended tube projecting into the airstream, creating pitot pressure.
- The simple tube design has disadvantages, such as moisture accumulation, which can be alleviated with a calibrated drain hole and electrical heater element.
- Static ports detect static pressure, either incorporated into other elements or as individual vents in the fuselage.
Machmeter
- A Machmeter measures airspeed and altitude, using the pressure difference between pitot and static pressure.
- The altimeter mechanism is calibrated to QNE and modifies the airspeed capsules' output.
- Altitude measurement provides equivalent temperature according to the ISA chart.
Vertical Speed Indicator (VSI)
- The VSI mechanism consists of a capsule sensing element, metering unit, and indicating element.
- During straight and level flight, the static pressure is constant, and the pointer is at the 0 feet per minute position.
- During climbs, the differential pressure causes the capsule to compress, rotating the lever link and indicating a climb condition.
Pitot Static System Maintenance
- The pitot static probe is a delicate instrument requiring care during handling and maintenance.
- Probe alignment and opening conditions are critical.
- Probe covers with trailing warning flags should be fitted during ground operations to prevent damage, injury, or wasp infestations.
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Description
Test your knowledge of the pitot static system, a crucial component of aircraft instrumentation. Learn about the pitot probe, pitot pressure, and its role in aerodynamics. This quiz is designed for pilots and aviation professionals preparing for the CASA Part 66 exam.
