Considering the given details with Pt representing "Total pressure", Ps indicating "Static pressure", and Pd representing "Dynamic pressure", which pressure is fed to the altimeter?
Refer to figure.
Pitot- Static system consists of a series of pipes around the cockpit through which air flows to feed three standard instruments:
- the altimeter,
- airspeed indicator and
- vertical speed indicator.
The altimeter can be considered a gauge that senses static air pressure changes and, utilizing calibration, expresses the change of static air pressure as a change in altitude.
The altimeter is calibrated to ISA conditions and can only indicate the correct altitude where ISA conditions exist.
Therefore, the correct answer is "Total Pressure (Pt) - Dynamic Pressure (Pd)", which is equal to Static Pressure (Ps).
NOTE:
- Static Pressure (Ps) + Dynamic Pressure (Pd) = Total Pressure (Pt) or Pitot pressure
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