A pitot tube is designed for measuring ram air pressure, but a static port is designed for measuring static pressure.

A blocked static port will cause the altimeter to freeze at a constant value, the altitude at which the static port became blocked. The vertical speed indicator will read zero and will not change at all, even if vertical speed increases or decreases.

The static port is located on the side of an aircraft and functions as a small air inlet. Its purpose is to measure static air pressure, also known as barometric pressure. The pressure within the static port is collected and then utilized by the altimeter and the vertical speed indicator (VSI).

Clean acrylic tube with water and dry with tissue. Clean pitot tube first with water, then with alcohol. You can use a small piece of wire to try to clean the holes if it seems needed. Reassemble.

The static system, on the other hand, affects your airspeed, altimeter, and vertical speed indicator (VSI) indications. A blocked static port will cause the altimeter and VSI to remain “frozen,” reporting the pressure trapped in the static system.

Basically, a pitot tube is used in wind tunnel experiments and on airplanes to measure flow speed. It’s a slender tube that has two holes on it. The front hole is placed in the airstream to measure what’s called the stagnation pressure. The side hole measures the static pressure.

The mass of the air per unit volume is called air density (“number” of air particles in a given space). density decreases with increasing altitude (Static pressure and temperature decrease with altitude, but the effect of decreasing static pressure is dominant).

The Static Pressure Ports’ electrical heating elements prevent ice accretion and water ingestion ensuring the performance of primary flight instruments is not degraded even under the most severe atmospheric conditions.