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Questions and Answers
What does the long pointer on the altimeter indicate?
What does the long pointer on the altimeter indicate?
- Feet directly at sea level
- Thousands of feet above sea level
- Hundreds of feet above sea level (correct)
- Tens of thousands of feet above sea level
How does the diaphragm in the altimeter respond to changes in static air pressure?
How does the diaphragm in the altimeter respond to changes in static air pressure?
- It expands and causes the pointers to move (correct)
- It contracts and causes a decrease in altitude reading
- It deflates and shows a lower pressure reading
- It remains unchanged regardless of pressure
What is indicated by the middle pointer on the altimeter?
What is indicated by the middle pointer on the altimeter?
- Ten thousand feet above sea level
- Less than one hundred feet above sea level
- Hundreds of feet above sea level
- Thousands of feet above sea level (correct)
Where is the barometric pressure window located on the altimeter?
Where is the barometric pressure window located on the altimeter?
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What facilitates the movement of the pointers in the altimeter?
What facilitates the movement of the pointers in the altimeter?
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Study Notes
Altimeter Functionality
- Indicates pressure altitude in feet above sea level.
- Composed of three pointers indicating different scales:
- Long pointer: hundreds of feet.
- Middle pointer: thousands of feet.
- Short pointer: ten thousands of feet.
Barometric Pressure Adjustment
- Features a barometric pressure window on the right side of the indicator dial.
- Adjustable using a knob located on the lower left corner of the instrument.
Mechanical Design
- Contains a sealed diaphragm linked to the pointers via mechanical linkage.
- The instrument case is connected to the static air system to ensure accurate readings.
Response to Pressure Changes
- As static air pressure decreases, the diaphragm expands.
- Diaphragm expansion results in movement of the pointers, reflecting changes in altitude.
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