- An error in a VSI (vertical speed indicator) in which the static source is blocked. Since there is no differential pressure in the system when the aircraft climbs or descends, the VSI will continue to show a level flight even when the aircraft is climbing or descending. In the case of partial blockage, the VSI will underread, and there will be more than usual lag when the aircraft levels out.
Aviation dictionary. 2014.
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Pitot-static system — A pitot static system is a system of pressure sensitive instruments that is most often used in aviation to determine an aircraft s airspeed, Mach number, altitude, and altitude trend. A pitot static system generally consists of a pitot tube, a… … Wikipedia