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Airupdate: Failed to start up the flight model


I'm trying to change an air file with Airupdate. I export it to text, change the tables (1503, 1504)...tab separated, the number of columns and rows at the top is correct (9 rows, 7 columns). FSX then gives the error "Failed to start up the flight model". I then load it into AAM which works fine...check the tables there and they look good. So, there's something FSX doesn't like. Any clues?

Have you made it so.

There are also tables, as the number of rows and columns is limited.
AAM indicates it, the FS but not accepted this.