Airspeed Indicator Flashcards
What happens if both the pitot tube opening and the drain hole become clogged simultaneously?
The pressure in the pitot tube is trapped and no change is noted on the airspeed indication
What effect does an unblocked static port have when the aircraft changes altitude?
A change is noted on the ASI, related to a change in static pressure
What is the relationship between airspeed indications and static and dynamic pressure?
Airspeed indications rely upon both static and dynamic pressure together; blockage of either affects ASI reading
What is the function of the diaphragm in the ASI?
The diaphragm pressurizes against static pressure, changing the airspeed indication via levers and indicators
Fill in the blank: At zero speed, dynamic pressure and static pressure are the same: _______.
static air pressure
What components does dynamic pressure include at increased speed?
Static pressure and dynamic pressure
How does the ASI use static pressure?
Static pressure is used as a reference pressure behind the diaphragm
What happens to the ASI indication if the pitot tube is obstructed during descent?
The ASI indication will show decreased airspeed due to increased static pressure
What is the effect on the ASI indication if the aircraft climbs with a clogged pitot tube?
The ASI indication will show greater airspeed due to decreased static pressure
What may cause the pitot tube to become blocked during flight?
Visible moisture, such as ice
What is the purpose of pitot heat in some aircraft?
To prevent blockage of the pitot tube during flight in visible moisture
What happens to the pressure inside the expandable capsule during descent?
The pressure remains constant while static pressure increases, causing indicated airspeed to decrease
True or False: The airspeed indicator will act like an altimeter when the aircraft descends with a clogged pitot tube.
True
