Pitot-Static 2.0 Flashcards
What does the airspeed indicator indicate at higher altitudes during static port blockage?
Lower than it should.
This is due to the incorrect pressure measurements caused by the blockage.
What happens to the altimeter when the static port is blocked?
It freezes on the altitude where it was blocked.
This means the altimeter will not reflect any changes in altitude.
What does the VSI show when the static port is blocked?
Freezes on zero.
This indicates that the vertical speed cannot be measured accurately.
What should you do after verifying a blockage in the static port?
Use an alternate static source or break the VSI window.
Breaking the VSI window may lead to reverse VSI information.
What does the airspeed indicator indicate when using an alternate static source?
Faster speed than it should.
This occurs due to lower static pressure being measured.
What happens to the altimeter when using an alternate static source?
Indicates higher than it should.
The change in static pressure affects the altitude reading.
What is the only instrument affected by pitot tube blockage?
Airspeed indicator.
Other instruments remain unaffected.
What occurs if the ram air inlet is clogged and the drain hole is open?
Airspeed drops to zero.
This happens because the airspeed indicator cannot measure pressure correctly.
What happens if both the air inlet and drain hole of the pitot tube are clogged?
The airspeed indicator will act as an altimeter.
It will no longer provide reliable airspeed readings.
What can be used to address suspected pitot blockage?
Pitot heat.
This helps to melt ice that may have formed in or on the pitot tube.
What is an altimeter?
An aneroid barometer showing height above a given pressure level.
It operates based on the standard pressure lapse rate of 1000’ per inch of mercury.
How does the altimeter translate sensed pressure into altitude indication?
Through a mechanical linkage between the aneroid and the display.
This allows the pilot to see the altitude based on pressure changes.
What does the altimeter setting knob allow the pilot to do?
Adjust the current pressure to the current altimeter setting.
This is crucial for accurate altitude readings.
What does the Kollsmann Window display?
Pressure setting in mb and/or inches of mercury (Hg).
This is essential for altimeter adjustments.
What is the standard altimeter setting above 18,000’ MSL?
29.92” Hg.
At this altitude, pilots operate in Flight Levels (FL).
What caution should pilots take when flying from high to low pressure areas?
Altitude will indicate higher, causing the pilot to fly lower than desired.
This emphasizes the importance of updating altimeter settings.
What does the Vertical Speed Indicator (VSI) indicate?
Rate-of-climb in fpm and rate trend.
It has a lag of 6-9 seconds for accurate readings.
How does the VSI respond to static pressure changes?
A diaphragm expands or contracts based on static pressure changes.
This mechanical response displays the current rate of climb.
What is the function of the Instantaneous VSI (IVSI)?
Solves the lag issue with vertical accelerometers.
This allows for immediate rate changes to be displayed.
How does the airspeed indicator measure airspeed?
By measuring the difference between impact air pressure and ambient pressure.
This pressure difference is referred to as dynamic pressure.
What is the formula for dynamic pressure in airspeed calculation?
Dynamic Pressure (airspeed) = Impact Pressure – Static pressure.
This formula is essential for understanding airspeed readings.
What is the role of the diaphragm in the airspeed indicator?
Receives ram pressure from the pitot tube.
This is crucial for converting pressure changes to airspeed readings.
