PPRuNe Forums - Quick question on altimetry errors

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RedBullGaveMeWings

17th Sep 2016 11:20

Quick question on altimetry errors

Just a quick question on altimetry errors: am I right in assuming that in the case of high pressure and low temperatures below ISA, the pressure error affects the altimeter more than the temperature error does?

Alex Whittingham

17th Sep 2016 14:56

It depends how high the pressure is and how low the temperature is.

gfunc

17th Sep 2016 19:16

A 1 C temperature deviation from ISA changes density altitude by 120ft, a 1 hPa pressure deviation changes it by 30ft. Since they don't have the same units (comparing apples to oranges), as Alex says: it depends.

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