Definition
The group of flight instruments that operate by sensing air pressure through the aircraft's pitot tube and static ports. The three primary pitot-static instruments are the airspeed indicator, the altimeter, and the vertical speed indicator. Each uses some combination of ram air pressure (collected by the pitot tube as the aircraft moves forward) and static air pressure (the undisturbed ambient air pressure measured at the static ports) to display airspeed, altitude, or rate of climb and descent.
Plain English
The cockpit instruments that work by measuring outside air pressure. They use two pressure sources on the aircraft to show how fast you're going, how high you are, and whether you're climbing or descending.
Context Anchor
Seen in instrument flying when discussing the airspeed indicator, altimeter, vertical speed indicator, and pitot/static system checks.
Derivation
The term combines two pressure sources. 'Pitot' is named after Henri Pitot, an 18th-century French engineer who invented the tube that measures the pressure of moving fluid. 'Static' comes from the Latin staticus, meaning 'at rest' -- referring to still, undisturbed air. So 'pitot-static' literally means 'moving-air and still-air' instruments.
Why Pilots Care
These instruments supply essential airspeed, altitude, and vertical speed information; any blockage or malfunction can immediately affect flight safety and instrument procedures.
Grounding Statement
These instruments turn outside air pressure into the basic cockpit information a pilot uses for speed, height, and climb or descent.
Intuition Check
“Static” does not mean electrical static here. It means the still, surrounding air pressure around the aircraft.
Example Sentence 1
During preflight, the pilot checked that all pitot-static instruments were reading correctly and that the pitot cover had been removed.
Example Sentence 2
After clearing the pitot tube of ice, the pitot-static instruments returned to normal indications.