So, if an altitude isn't listed in the AF/D should we now assume its
1000'?


Yes. But be careful about assUme.


And when it turns out to be 800, who is allowed to call the
FAA to have the entry modified?


Anybody. Tell them what you've observed, and have them contact the airport for
verification. It's even better if you talk to the airport head first and get
appropriate contact info for the FAA. It's just a "correction" to the AF/D,
like any other correction (lake in the wrong place on the sectional, tower
mismarked, stuff like that)

Jose


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