30 Questions
What happens to a bimetallic U bracket strip when there is an increase in ambient temperature?
It is unaffected by pressure change and acts as a spring
What is the purpose of the static ports in a pitot static system?
To measure static pressure
Where are the static ports typically located on an aircraft?
Along the sides of the fuselage
What is the function of the pitot tube in a pitot static system?
To measure ram pressure of the airstream
What is included in a pitot/static tube?
Static ports and electric heaters
What is the term for the system of ports and tubing on an aircraft that supplies pitot and static pressure for the instruments?
Pitot static system
What is the reason for temperature compensation in instruments?
To compensate for temperature changes affecting instrument readings
How does a manifold pressure gauge work?
It uses an evacuated bellows to reference measured pressure to a vacuum
What occurs when a bimetallic strip is heated?
It curls due to the difference in expansion of the two metals
Why is an aneroid capsule not suitable for use in cold climates?
It becomes less malleable and less responsive to pressure changes
What is psid an alternative term for?
Psig because the pressure measured is the difference between atmospheric and the pressure under test
What is the purpose of a bimetallic strip?
To compensate for temperature changes
What is the primary function of the bimetallic device inside the sensitive altimeter?
To provide automatic compensation for temperature changes
What is the range of measurement of the sensitive altimeter?
Between 35 000 to 50 000 feet or more
What is the function of the knob on the front of the altimeter?
To compensate for non-standard atmospheric pressure
How many equally spaced marks are on the dial face of the sensitive altimeter?
10
What is the function of the 100-foot pointer?
It rotates once around the dial for each 100-foot change in altitude
How often does the 1000-foot pointer rotate once around the dial?
Every 10 000 feet
What is the first variable measured in a Machmeter?
Airspeed
What provides the altitude information in a Machmeter?
An aneroid capsule sensitive to static pressure
What is the function of the intermediate sliding rocking shaft?
To divide the altitude unit
How is the altimeter mechanism calibrated?
To QNE standards
What is the advantage of combining a Machmeter and airspeed indicator into one instrument?
Saved space on the panel
What is used to drive the indicator in a modern Mach Airspeed Indicator?
Pneumatic power and/or servomotors
What happens to the airspeed indicator when an aircraft descends with a partial blockage in the static line?
It will overread
What is the effect of a pitot tube blockage on the altimeter?
It has no effect
What happens to the airspeed indicator when an aircraft climbs with a partial blockage in the static line?
It will underread
What is the effect of a blocked pitot line on the airspeed indicator?
It shows no reading
What happens to the airspeed indicator when an aircraft accelerates with a blocked pitot line?
It fails to display
What is the benefit of selecting the 'alternate' static port in an aircraft with a partial blockage in the static line?
It bypasses the blockage
Explore the concepts of pressure measurement, reference points, Sylphon-type bellows, temperature compensation, and more. Understand how instrument sensing elements are affected by temperature changes and how pressure measurements are adjusted accordingly.
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