In severe icing conditions, blockage of the ram air input and drain hole of the pitot system will cause a continuous deceleration on the airspeed indicator during a climb.
The indicated airspeed would show a continuous deceleration while climbing in severe icing conditions if both the ram air input and the drain hole of the pitot system are blocked. When power is applied and a climb is initiated, the blockage results in incorrect air pressure being sensed, causing the airspeed indicator to display a continuous decrease in speed as the aircraft climbs.
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