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ALT HLD not holding altitude according to static pressure but altimeter indication

MrHalfknight
in Systems

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Changing from STD in cruise to local QNH in P.ALT or ALT HLD mode should not lead to a climb/decend due to different indicated altitdues. the aircraft should hold the static pressure constant, thus maintain altitude even if the altimeter reading is now different.

  • Author

Not specifically for this aircraft. however, every aircraft i´ve ever flown or worked on worked that way, as the aircraft senses and compares and maintains static pressure from the pressure ports for auto flight operations. This logic is also in use in every other airbus (real world). 

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