Which pressure from the pitot-static system is used by the airspeed indicator?

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Multiple Choice

Which pressure from the pitot-static system is used by the airspeed indicator?

Explanation:
The airspeed indicator is driven by the stagnation (total) pressure from the Pitot tube. As the aircraft moves, air is brought to rest in the Pitot tube, creating Pt. The instrument also uses static pressure from the static ports as a reference. The gauge responds to the difference between Pt and Ps, which is the dynamic pressure that correlates to airspeed. So the pressure fed into the airspeed indicator from the pitot-static system is the Pitot pressure (total pressure).

The airspeed indicator is driven by the stagnation (total) pressure from the Pitot tube. As the aircraft moves, air is brought to rest in the Pitot tube, creating Pt. The instrument also uses static pressure from the static ports as a reference. The gauge responds to the difference between Pt and Ps, which is the dynamic pressure that correlates to airspeed. So the pressure fed into the airspeed indicator from the pitot-static system is the Pitot pressure (total pressure).

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