What it is: It uses pitot pressure from the airflow and static pressure from the surrounding air to drive key flight instruments. In most sims, those inputs affect the airspeed indicator, altimeter, vertical speed indicator and, in many aircraft, related autopilot and air data functions.
In practice: During a simulated flight, this system matters whenever you climb, descend, accelerate or fly in icing conditions. If the pitot tube ices up, indicated airspeed can become unreliable or freeze, while blocked static ports can make altitude and vertical speed readings behave incorrectly. That can lead to bad pitch and power choices, unstable approaches or autopilot problems if the aircraft depends on air data inputs. Simmers usually manage this by using pitot heat when conditions require it and by cross-checking instruments if something looks wrong.
Key considerations:
- Pitot heat is the main protection against pitot icing; in many aircraft you should switch it on before entering visible moisture in cold conditions.
- A blocked pitot tube mainly affects airspeed, while blocked static ports affect altitude and vertical speed as well.
- Unreliable pitot-static data can also disrupt autopilot modes that rely on airspeed or altitude information.
