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How is the reading of the Airspeed Indicator (ASI) affected when ice blocks the static air ports?
  • A
    The Airspeed Indicator shows an increase in speed with a decrease in altitude.
  • B
    The on board emergency system switches automatically to the standby static pressure port.
  • C
    The Airspeed Indicator shows a decrease in speed with a decrease in altitude.
  • D
    The Airspeed Indicator no longer indicates any change in speed.

Refer to figures.
If the static ports are blocked by ice, the ASI won’t be fed with static pressure anymore. In this case, when the aircraft descends, the pressure inside the case will remain the same as when the static port got blocked, and the differential pressure will increase, showing an increase in airspeed.

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