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bobtait replied the topic: Quick question on Static source blockage
This question comes up occasionally.
It depends on your definition of 'over reading'. If the altimeter were over reading, it would be giving consistently higher readings than the actual altitude. So as altitude changed, the altimeter would be changing its indications but they would always be higher than the actual altitude.
If the static source was blocked, the altimeter reading would be fixed at the height at which the blockage occurred. It would simply be unserviceable. You couldn't call that over reading.