Definition
The pitot/static system is the network of ports, lines, and instruments that uses outside air pressure to drive the airspeed indicator, altimeter, and vertical speed indicator. The pitot side measures ram air pressure from forward motion through a forward-facing tube, while the static side measures ambient air pressure through flush ports on the side of the aircraft. The instruments compare these two pressures to calculate airspeed, altitude, and rate of climb or descent.
Plain English
It is the set of small air openings and tubes on the outside of the aircraft that feed three flight instruments: the one showing how fast you are going, the one showing how high you are, and the one showing how quickly you are climbing or descending.
Context Anchor
Seen during preflight when checking the pitot tube, static ports, and any covers or blockages before flight.
Derivation
Pitot comes from Henri Pitot, the French engineer who in the 1700s designed the tube that measures fluid flow by capturing the pressure of moving air or water. Static comes from Latin staticus, meaning standing still — referring to the undisturbed air pressure surrounding the aircraft. Putting the two together names the pairing the instruments rely on: moving air pressure compared against still air pressure.
Why Pilots Care
Blocked or damaged pitot-static components produce incorrect airspeed and altitude readings that can lead to loss of control, especially in instrument conditions.
Grounding Statement
The pitot/static system works by comparing air pushed into the airplane by forward motion with the surrounding outside air pressure.
Intuition Check
Static does not mean electrical static here. It means outside air pressure that is not being rammed into the pitot tube by forward motion.
Example Sentence 1
During the walk-around, the pilot checked that the pitot/static openings were clear and that the pitot tube cover had been removed.
Example Sentence 2
A clogged static port caused the altimeter to stop changing even though the airplane continued to climb.