17 / 20

If the static ports are completely clogged up by ice during a climb, the vertical speed indicator shows…

  • A
    an increasing rate of climb if the ambient static pressure decreases.
  • B
    a constant rate of climb, even if the aircraft is levelling out.
  • C
    zero.
  • D
    a descent if the ambient static pressure is less than the pressure in the instrument.
Static port clogged by ice during the climb:
  • Altimeter: the reading is constant. It cannot change as static pressure is not flowing into the aneroid capsule.
  • VSI: the instrument indicates zero. After both static pressure measurements (from the metering unit and the capsule) equalized.  
  • ASI: the reading will gradually decrease. The pitot tube measures both static and dynamic pressure. Since the static pressure decreases with altitude, the ASI will indicate a gradual decrease in airspeed as there’s no other static pressure input to cancel out the static pressure sensed through the pitot tube.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

Keyboard Shortcut Use Keyboard Shortcuts