> It’s very unlikely that both would fail simultaneously. Ice, insects, birds, and volcanic ash are all things that tend to cause the pitot and the static tube

> It’s very unlikely that both would fail simultaneously. Ice, insects, birds, and volcanic ash are all things that tend to cause the pitot and the static tubes to become blocked. When you encounter ice, insects, birds, and volcanic ash, it is often the case that you get multiple simultaneous blockages. Blockages of the various tubes are not statistically independent events in practice.