What is true static pressure? How do we define it? Is it same as corrected static pressure for installation and errors? ARINC 429P1-18 defines Static pressure as corrected and uncorrected where in few places I have heard this term "True static pressure".

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  • $\begingroup$ A reference of where you've heard/seen this would be useful, as I'm not familiar with the term $\endgroup$ – selectstriker2 Dec 11 '18 at 22:02
  • $\begingroup$ Aviation and Aeronautical Engineering, Volume 6, Section "Altitude errors in Aerial Navigation".books.google.com/… $\endgroup$ – Huntkil Dec 11 '18 at 22:37
  • $\begingroup$ The text you linked to indicates that the "true static pressure" takes into consideration airspeed, position on the aircraft, and air density $\endgroup$ – selectstriker2 Dec 11 '18 at 22:41
  • $\begingroup$ And it also might be beneficial to note that the text is almost a century old, so some of the terminology and error values may be different than those used today $\endgroup$ – selectstriker2 Dec 11 '18 at 22:43
  • $\begingroup$ How is this different from static pressure we get from pitot static tube ? I have never heard this term before. I was working on flare guidance system and they are also using "true static pressure " for computational purpose. So what is this term and why are we using it ? $\endgroup$ – Huntkil Dec 11 '18 at 22:45

From what I can see, the "true" static pressure is the measured static pressure corrected for airspeed & position (Static Source Error Correction).

In my copy of ARINC 429 (May 2004) I don't see a label definition that fits this "true static pressure". Label 171 can be used for manufacturer defined data, so I would see if you can get a better answer from the manufacturer of your data source.

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