During a climb, if the airspeed indicator reads high, what could be causing this if the pitch is increased further?

When the airspeed indicator reads high during a climb while the pitch is increased further, one possible explanation is that both the pitot tube and drain hole are iced over. In this scenario, the blockage of the pitot tube would prevent the correct measurement of dynamic pressure, leading to erroneous high readings on the airspeed indicator.

In conditions where ice formation is possible, if the pitot tube itself is blocked, it will not be able to measure the incoming air pressure accurately. At the same time, if the drain hole is also iced over, it can trap moisture and contribute to incorrect readings, exacerbating the issue by not allowing the pitot system to equalize pressure properly.

Therefore, both components can be impacted by icing conditions, leading to a combination of input and output errors in the airspeed calculation. This makes the situation more complex, as one blockage can mask or compound the errors created by the other. Hence, acknowledging that both the pitot tube and the drain hole could be iced over provides a comprehensive understanding of how these systems interrelate and affect airspeed indications during a climb.