Recently flew a leg where the airspeed indicator never increased from 0 and remained at 0 for the duration of flight. Upon landing, maintenance discovered a blockage in the primary static port. The pitot and cockpit static ports were both ok. The static source selector was in the static (primary) position for the whole flight.
It appears as though the system was 'confused' between a static blockage and a pitot blockage. The airspeed indicator should read abnormally, but not zero with a static port blockage. It should read zero with a pitot blockage.
Debug indicated static blockage 0.2, secondary static 0.0, pitot 0.0 inflight.
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Well, looks like a random gremlin. Airspeed indicator remained frozen at zero after fixing the static blockage (debug had static 0.0, cockpit static 0.0, pitot 0.0) and no blockages reported on debug (nor airspeed indicator marked failed on debug). Landed and used "Fix all problems" key to no effect, airspeed indicator remained frozen at zero. Exited the sim, deleted data.dat, and all's well now. Can't reliably say what happened. Gremlin.